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DEBT SECURITIES - Schedule of Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value
Less than 12 months	$ 172,731	$ 185,148
12 months or more	958,493	1,281,595
Total	1,131,224	1,466,743
Unrealized Losses
Less than 12 months	(1,252)	(895)
12 months or more	(150,930)	(229,430)
Total	(152,182)	(230,325)
Fair Value
12 months or more	625,957	675,053
Total	625,957	675,053
Unrealized Losses
12 months or more	(120,428)	(151,577)
Total	(120,428)	(151,577)
Obligations of U.S. government corporations and agencies
Fair Value
Less than 12 months	39,156	0
12 months or more	0	1,328
Total	39,156	1,328
Unrealized Losses
Less than 12 months	(80)	0
12 months or more	0	(8)
Total	(80)	(8)
Obligations of states and political subdivisions
Fair Value
Less than 12 months	28,592	11,234
12 months or more	92,205	119,723
Total	120,797	130,957
Unrealized Losses
Less than 12 months	(361)	(209)
12 months or more	(9,537)	(16,527)
Total	(9,898)	(16,736)
Asset-backed securities
Fair Value
Less than 12 months	10,005	14,997
12 months or more	0	0
Total	10,005	14,997
Unrealized Losses
Less than 12 months	(35)	(3)
12 months or more	0	0
Total	(35)	(3)
Commercial mortgage-backed securities
Fair Value
Less than 12 months	4,986	6,238
12 months or more	71,830	85,936
Total	76,816	92,174
Unrealized Losses
Less than 12 months	(48)	(42)
12 months or more	(11,143)	(15,089)
Total	(11,191)	(15,131)
Fair Value
12 months or more	302,615	338,288
Total	302,615	338,288
Unrealized Losses
12 months or more	(65,210)	(77,242)
Total	(65,210)	(77,242)
Residential mortgage-backed securities
Fair Value
Less than 12 months	84,023	152,081
12 months or more	765,361	930,642
Total	849,384	1,082,723
Unrealized Losses
Less than 12 months	(708)	(640)
12 months or more	(128,559)	(191,259)
Total	(129,267)	(191,899)
Fair Value
12 months or more	323,342	336,765
Total	323,342	336,765
Unrealized Losses
12 months or more	(55,218)	(74,335)
Total	(55,218)	(74,335)
Corporate debt securities
Fair Value
Less than 12 months	5,969	598
12 months or more	29,097	143,966
Total	35,066	144,564
Unrealized Losses
Less than 12 months	(20)	(1)
12 months or more	(1,691)	(6,547)
Total	$ (1,711)	$ (6,548)

LEASES - Schedule of Lease Costs and Other Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Finance lease costs:
Amortization expense	$ 269	$ 0	$ 0
Interest expense	267	0	0
Variable lease costs	60	58	38
Short-term lease costs	58	83	50
Total lease cost	6,574	2,493	2,483
Cash flows related to leases
Operating cash flows from operating leases	10,185	3,992	4,173
Operating cash flows from finance leases	267	0	0
Financing cash flows from finance leases	141	0	0
Right of use assets obtained in exchange for operating lease liabilities	25,590	1,579	231
Right of use assets obtained in exchange for finance lease liabilities	6,365	0	0
Right of use assets obtained in exchange for operating lease liabilities	25,590	1,579	231
Net occupancy expense of premises
Operating lease costs:
Premises and Equipment rent expense	5,891	2,335	2,379
Furniture and equipment expenses
Operating lease costs:
Premises and Equipment rent expense	29	17	$ 16
CrossFirst
Cash flows related to leases
Right of use assets obtained in exchange for operating lease liabilities	23,200
Right of use assets obtained in exchange for finance lease liabilities	6,400
Right of use assets obtained in exchange for operating lease liabilities	$ 23,200
M&M
Cash flows related to leases
Right of use assets obtained in exchange for operating lease liabilities		100
Right of use assets obtained in exchange for operating lease liabilities		100
Additional right of use assets obtained during the period in exchange for operating lease liabilities		$ 700

DEBT SECURITIES - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt securities available for sale
Amortized Cost	$ 2,300,845	$ 2,039,952
Unrealized gross gains	13,885	594
Unrealized gross losses	(152,182)	(230,325)
Fair Value	2,162,548	1,810,221
Debt securities held to maturity
Amortized Cost	746,385	826,630
Unrecognized gross gains	0	0
Unrecognized gross losses	(120,428)	(151,577)
Fair Value	625,957	675,053
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	111,876	1,408
Unrealized gross gains	250	0
Unrealized gross losses	(80)	(8)
Fair Value	112,046	1,400
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	270,682	156,534
Unrealized gross gains	3,089	31
Unrealized gross losses	(9,898)	(16,736)
Fair Value	263,873	139,829
Asset-backed securities
Debt securities available for sale
Amortized Cost	265,203	336,379
Unrealized gross gains	412	181
Unrealized gross losses	(35)	(3)
Fair Value	265,580	336,557
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	143,522	107,305
Unrealized gross gains	611	0
Unrealized gross losses	(11,191)	(15,131)
Fair Value	132,942	92,174
Debt securities held to maturity
Amortized Cost	367,825	415,530
Unrecognized gross gains	0	0
Unrecognized gross losses	(65,210)	(77,242)
Fair Value	302,615	338,288
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,464,347	1,279,090
Unrealized gross gains	9,336	19
Unrealized gross losses	(129,267)	(191,899)
Fair Value	1,344,416	1,087,210
Debt securities held to maturity
Amortized Cost	378,560	411,100
Unrecognized gross gains	0	0
Unrecognized gross losses	(55,218)	(74,335)
Fair Value	323,342	336,765
Corporate debt securities
Debt securities available for sale
Amortized Cost	45,215	159,236
Unrealized gross gains	187	363
Unrealized gross losses	(1,711)	(6,548)
Fair Value	$ 43,691	$ 153,051

INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

Schedule of the Components of Income Taxes

The following table presents components of Busey’s income taxes included in the accompanying Consolidated Statements of Income:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Income taxes
Current expense:
Federal	$	33,596	$	26,696	$	20,139
State	9,708		11,533		14,120
Deferred expense:
Federal	(579)		1,561		(1,557)
State	8,653		(177)		(1,363)
Total income taxes	$	51,378	$	39,613	$	31,339

Schedule of the Reconciliation of Federal and State Income Taxes at Statutory rates to the Income Taxes Included in the Statements of Income

The following table provides a reconciliation of federal and state income taxes at statutory rates to the income taxes included in the accompanying Consolidated Statements of Income:


	Years Ended December 31,
(dollars in thousands)	2025				2024				2023
Income taxes at federal statutory rate	$	39,194	21.0	%	$	32,194	21.0	%	$	32,320	21.0	%
State and local income taxes (net of federal income tax effect)1	14,470		7.8	%	10,890		7.1	%	10,072		6.5	%
Tax credit investments:
Low income housing tax credits	(7,954)		(4.3)	%	(5,657)		(3.7)	%	(11,243)		(7.3)	%
New markets tax credits	(9,008)		(4.8)	%	(9,474)		(6.2)	%	(2,416)		(1.6)	%
Other credits	(1,589)		(0.9)	%	(883)		(0.6)	%	(1,306)		(0.8)	%
Nontaxable or nondeducitble items:
Tax-exempt interest, net	(2,148)		(1.2)	%	(1,141)		(0.7)	%	(1,493)		(1.0)	%
Compensation	3,079		1.7	%	407		0.3	%	(217)		(0.1)	%
Other nontaxable or nondeductible	546		0.2	%	(381)		(0.3)	%	(793)		(0.5)	%
Other items:
Investment in partnerships	14,692		7.9	%	13,244		8.6	%	5,714		3.7	%
Other	96		0.1	%	414		0.3	%	701		0.5	%
Income taxes and effective income tax rate	$	51,378	27.5	%	$	39,613	25.8	%	$	31,339	20.4	%

___________________________________________

1.State taxes in Illinois for 2025, 2024, and 2023 made up the majority (greater than 50%) of the tax effect in this category.

Schedule of the Deferred Tax Assets and Liabilities

Net deferred taxes, reported in other assets or other liabilities on Busey’s Consolidated Balance Sheets, include the deferred tax assets and liabilities presented in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Deferred taxes
Deferred tax assets:
ACL	$	70,282	$	23,685
Unrealized loss on cash flow hedge	2,744		7,256
Unrealized losses on securities available for sale, net	43,634		61,479
Unrealized losses on securities held to maturity	6,335		8,068
Stock-based compensation	8,089		6,431

Purchase accounting adjustments	3,695		2,076
Accrued vacation	713		493
Lease liabilities	8,016		2,951
Employee costs	12,359		5,725
Tax credits	2,873		—
State net operating loss carryovers	712		—

Other	1,931		—
Deferred tax assets before valuation allowances	161,383		118,164
Valuation allowances	(712)		—
Total deferred tax assets	160,671		118,164

Deferred tax liabilities:

Basis in premises and equipment	(6,716)		(2,419)
Affordable housing partnerships and other investments	(8,920)		(8,011)
Purchase accounting adjustments	(927)		(1,022)
Mortgage servicing assets	(872)		(745)
Basis in core deposit, customer intangible assets, and asset purchase goodwill	(20,427)		(3,325)
Deferred loan origination costs	(1,836)		(3,317)
Right of use assets	(7,427)		(2,835)
Unrealized gain on equity securities	(1,268)		(172)
Other	(900)		(856)
Total deferred tax liabilities	(49,293)		(22,702)

Net deferred tax asset	$	111,378	$	95,462

Schedule of Income Tax Payments

Income tax payments by jurisdiction, excluding payments for tax credit investments, are presented in the following table:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Income tax payments by jurisdiction
Federal	$	16,794	$	11,200	$	18,300
Illinois1	*		*		5,240
Other	4,115		1,707		1,868
Total income tax payments	$	20,909	$	12,907	$	25,408

___________________________________________

1.The amount of income taxes paid during the years ended December 31, 2025 and 2024, does not meet the five percent disaggregation threshold.

PORTFOLIO LOANS - Schedule of Risk Grades of Portfolio Loans, Further Sorted by Origination (PY) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 2,775,707	$ 1,137,553
2024 charge-off	7,674	9
2023	1,552,638	1,129,573
2023 charge-off	14,536	15,011
2022	1,762,494	1,485,489
2022 charge-off	4,617	254
2021	2,087,139	1,250,313
2021 charge-off	1,497	3,099
2020	1,612,675	619,027
2020 charge-off	13,844	4
Prior	1,277,588	774,903
Prior, charge-off	11,581	1,189
Revolving Loans	2,499,558	1,300,229
Revolving Loans, charge-off	5,893	0
Total	13,567,799	7,697,087
Total, gross write-offs	59,642	19,566
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	11,818,297	6,764,070
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,229,823	756,610
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	349,822	92,296
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	118,659	62,023
Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	51,198	22,088
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	10,818,515	5,552,288
Commercial loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	9,117,788	4,635,264
Commercial loans \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,199,149	747,202
Commercial loans \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	342,315	91,414
Commercial loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	116,860	59,480
Commercial loans \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	42,403	18,928
Commercial loans \| C&I and other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2024	886,826	376,534
2024 charge-off	4,667	0
2023	582,244	206,282
2023 charge-off	3,332	14,980
2022	476,569	215,489
2022 charge-off	4,347	148
2021	297,050	144,671
2021 charge-off	1,450	22
2020	243,208	76,789
2020 charge-off	13,591	0
Prior	148,697	144,014
Prior, charge-off	11,456	303
Revolving Loans	1,594,614	740,736
Revolving Loans, charge-off	5,716	0
Total	4,229,208	1,904,515
Total, gross write-offs	44,559	15,453
Commercial loans \| C&I and other commercial \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	833,539	320,831
2023	486,278	147,909
2022	342,560	163,870
2021	207,053	125,053
2020	178,429	74,146
Prior	122,904	117,234
Revolving Loans	1,396,826	596,295
Total	3,567,589	1,545,338
Commercial loans \| C&I and other commercial \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	21,750	38,734
2023	79,853	49,394
2022	56,387	44,709
2021	38,786	16,393
2020	48,624	2,175
Prior	16,778	20,964
Revolving Loans	112,935	109,055
Total	375,113	281,424
Commercial loans \| C&I and other commercial \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	21,712	1,718
2023	11,609	2,293
2022	56,578	5,658
2021	26,343	2,634
2020	5,339	106
Prior	800	2,540
Revolving Loans	54,433	21,203
Total	176,814	36,152
Commercial loans \| C&I and other commercial \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	8,336	15,186
2023	605	6,545
2022	20,444	788
2021	14,603	591
2020	9,868	320
Prior	3,655	2,424
Revolving Loans	17,883	11,895
Total	75,394	37,749
Commercial loans \| C&I and other commercial \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,489	65
2023	3,899	141
2022	600	464
2021	10,265	0
2020	948	42
Prior	4,560	852
Revolving Loans	12,537	2,288
Total	34,298	3,852
Commercial loans \| CRE
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,339,978	467,816
2024 charge-off	1,297	0
2023	569,197	488,528
2023 charge-off	11,057	0
2022	841,829	828,525
2022 charge-off	0	0
2021	1,197,182	709,847
2021 charge-off	0	2,999
2020	941,492	389,461
2020 charge-off	253	0
Prior	612,815	358,936
Prior, charge-off	0	315
Revolving Loans	47,525	26,451
Revolving Loans, charge-off	0	0
Total	5,550,018	3,269,564
Total, gross write-offs	12,607	3,314
Commercial loans \| CRE \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,077,169	291,503
2023	483,950	354,591
2022	710,448	755,266
2021	1,035,426	645,994
2020	740,680	356,867
Prior	515,631	314,340
Revolving Loans	43,830	25,457
Total	4,607,134	2,744,018
Commercial loans \| CRE \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	210,673	115,078
2023	61,926	132,900
2022	119,986	60,611
2021	143,072	62,408
2020	161,387	28,320
Prior	69,789	38,733
Revolving Loans	2,572	895
Total	769,405	438,945
Commercial loans \| CRE \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	49,648	39,252
2023	22,642	643
2022	2,991	8,020
2021	13,811	1,395
2020	32,109	4,165
Prior	18,858	1,517
Revolving Loans	908	49
Total	140,967	55,041
Commercial loans \| CRE \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2,416	6,983
2023	679	355
2022	3,857	4,628
2021	4,873	50
2020	7,316	95
Prior	5,324	4,346
Revolving Loans	215	50
Total	24,680	16,507
Commercial loans \| CRE \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	72	15,000
2023	0	39
2022	4,547	0
2021	0	0
2020	0	14
Prior	3,213	0
Revolving Loans	0	0
Total	7,832	15,053
Commercial loans \| Real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
2024	447,571	185,219
2024 charge-off	0	0
2023	270,502	140,905
2023 charge-off	0	0
2022	111,929	12,205
2022 charge-off	0	0
2021	112,234	25,233
2021 charge-off	0	0
2020	12,862	2,213
2020 charge-off	0	0
Prior	2,733	1,124
Prior, charge-off	0	0
Revolving Loans	81,458	11,310
Revolving Loans, charge-off	0	0
Total	1,039,289	378,209
Total, gross write-offs	0	0
Commercial loans \| Real estate construction \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	395,019	159,825
2023	268,117	134,450
2022	107,930	12,205
2021	89,673	24,781
2020	5,356	2,213
Prior	2,733	1,124
Revolving Loans	74,237	11,310
Total	943,065	345,908
Commercial loans \| Real estate construction \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	18,571	20,170
2023	2,112	6,455
2022	3,999	0
2021	22,561	208
2020	167	0
Prior	0	0
Revolving Loans	7,221	0
Total	54,631	26,833
Commercial loans \| Real estate construction \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	17,961	0
2023	0	0
2022	0	0
2021	0	221
2020	6,573	0
Prior	0	0
Revolving Loans	0	0
Total	24,534	221
Commercial loans \| Real estate construction \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	16,020	5,224
2023	0	0
2022	0	0
2021	0	0
2020	766	0
Prior	0	0
Revolving Loans	0	0
Total	16,786	5,224
Commercial loans \| Real estate construction \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	273	0
2022	0	0
2021	0	23
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	273	23
Retail loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,749,284	2,144,799
Retail loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,700,509	2,128,806
Retail loans \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Total	30,674	9,408
Retail loans \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,507	882
Retail loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,799	2,543
Retail loans \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	8,795	3,160
Retail loans \| CRE
Financing Receivable, Credit Quality Indicator [Line Items]
2024	96,099	102,988
2024 charge-off	1,164	0
2023	128,430	238,099
2023 charge-off	0	0
2022	298,742	371,259
2022 charge-off	0	0
2021	450,218	358,351
2021 charge-off	0	0
2020	410,552	148,260
2020 charge-off	0	0
Prior	512,458	270,229
Prior, charge-off	51	168
Revolving Loans	258,117	207,271
Revolving Loans, charge-off	36	0
Total	2,154,616	1,696,457
Total, gross write-offs	1,251	168
Retail loans \| CRE \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	93,212	101,582
2023	127,475	237,306
2022	269,877	366,820
2021	446,309	354,380
2020	407,851	147,236
Prior	508,504	267,431
Revolving Loans	252,987	205,885
Total	2,106,215	1,680,640
Retail loans \| CRE \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2,686	1,255
2023	569	550
2022	24,601	2,733
2021	1,492	3,377
2020	267	872
Prior	482	124
Revolving Loans	577	497
Total	30,674	9,408
Retail loans \| CRE \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	47	151
2023	78	0
2022	4,028	344
2021	1,454	0
2020	1,686	0
Prior	0	372
Revolving Loans	214	15
Total	7,507	882
Retail loans \| CRE \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	243
2022	108	1,018
2021	440	503
2020	484	0
Prior	631	776
Revolving Loans	136	3
Total	1,799	2,543
Retail loans \| CRE \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	154	0
2023	308	0
2022	128	344
2021	523	91
2020	264	152
Prior	2,841	1,526
Revolving Loans	4,203	871
Total	8,421	2,984
Retail loans \| Retail other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5,233	4,996
2024 charge-off	546	9
2023	2,265	55,759
2023 charge-off	147	31
2022	33,425	58,011
2022 charge-off	270	106
2021	30,455	12,211
2021 charge-off	47	78
2020	4,561	2,304
2020 charge-off	0	4
Prior	885	600
Prior, charge-off	74	403
Revolving Loans	517,844	314,461
Revolving Loans, charge-off	141	0
Total	594,668	448,342
Total, gross write-offs	1,225	631
Retail loans \| Retail other \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5,233	4,996
2023	2,265	55,665
2022	33,349	57,944
2021	30,321	12,207
2020	4,561	2,304
Prior	885	589
Revolving Loans	517,680	314,461
Total	594,294	448,166
Retail loans \| Retail other \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Retail loans \| Retail other \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Retail loans \| Retail other \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Retail loans \| Retail other \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	94
2022	76	67
2021	134	4
2020	0	0
Prior	0	11
Revolving Loans	164	0
Total	$ 374	$ 176

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Stockholders' Equity [Abstract]
Accounting Standards Update [Extensible Enumeration]			Accounting Standards Update 2023-02 [Member]
Cash dividends, common stock (in dollars per share)	$ 1.00	$ 0.96	$ 0.96

- Definition

Indicates amendment to accounting standards.

+ References

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-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

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+ Details

SIGNIFICANT ACCOUNTING POLICIES - Restricted Bank Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Changes in accumulated other comprehensive income (loss) by component, net of tax
Restricted bank stock	$ 68.1	$ 43.9
Investment in FHLB stock	8.9	6.0
Bankers’ Bank of the West Bancorp, Inc. bank stock	0.0
Federal Reserve Bank
Changes in accumulated other comprehensive income (loss) by component, net of tax
Restricted cash	$ 68.1	$ 43.9

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-4

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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147482765/220-10-50-5

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-Name Accounting Standards Codification
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-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147481674/830-30-50-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-17

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
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-Paragraph 20
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

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-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

+ Details

SIGNIFICANT ACCOUNTING POLICIES - Schedule of Stock Issuances (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	222,750	0
Preferred shares outstanding (in shares)	222,750	0
Preferred stock, value, issued	$ 0	$ 0
Preferred stock, liquidation preference	222,750,000	0
Issuance of preferred stock, net of issuance costs	$ 207,447,000
Series A Non-Cumulative Perpetual Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)	7,750
Preferred stock, shares issued (in shares)	7,750
Preferred shares outstanding (in shares)	7,750
Preferred stock, value, issued	$ 7.75
Preferred stock, value, outstanding	$ 7.75
Preferred stock, liquidation preference (in dollars per share)	$ 1,000
Preferred stock, liquidation preference	$ 7,750,000
Issuance of preferred stock, net of issuance costs	$ 7.75	0	$ 0
8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate	8.25%
Preferred stock, shares authorized (in shares)	230,000
Preferred stock, shares issued (in shares)	215,000
Preferred shares outstanding (in shares)	215,000
Preferred stock, value, issued	$ 215.00
Preferred stock, value, outstanding	$ 215.00
Preferred stock, liquidation preference (in dollars per share)	$ 1,000
Preferred stock, liquidation preference	$ 215,000,000
Issuance of preferred stock, net of issuance costs	$ 215.00	$ 0	$ 0

REGULATORY CAPITAL - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Banking and Thrift, Other Disclosure [Abstract]
Busey bank paid dividends to the company, amount received	$ 160.0	$ 100.0	$ 90.0

PORTFOLIO LOANS

12 Months Ended

Dec. 31, 2025

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

PORTFOLIO LOANS

NOTE 4. PORTFOLIO LOANS

Loan Categories

Busey’s lending can be summarized into two primary categories: commercial and retail. Loans within these categories are further classified by lending activity: C&I and other commercial, CRE, real estate construction, retail real estate, and retail other. Distributions of the loan portfolio by loan category and lending activity is presented in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Commercial loans
C&I and other commercial	$	4,229,208	$	1,904,515
CRE	5,550,018		3,269,564
Real estate construction	1,039,289		378,209
Total commercial loans	10,818,515		5,552,288
Retail loans
Retail real estate	2,154,616		1,696,457
Retail other	594,668		448,342
Total retail loans	2,749,284		2,144,799

Total portfolio loans	13,567,799		7,697,087
ACL	(174,023)		(83,404)
Portfolio loans, net	$	13,393,776	$	7,613,683

Net deferred loan origination costs included in the balances above were $7.0 million as of December 31, 2025, compared to $12.5 million as of December 31, 2024. Net accretable purchase accounting adjustments included in the balances above reduced loans by $86.6 million as of December 31, 2025, and by $8.8 million as of December 31, 2024. Deposit account overdrafts reported as loans totaled $7.1 million as of December 31, 2025, and $3.8 million as of December 31, 2024.

In addition to loans assumed through acquisition activities, about which information can be found in “Note 2. Business Combinations,” Busey purchased retail other loans with a principal balance of $117.3 million during the year ended December 31, 2025, and retail real estate loans with a principal balance of $6.9 million during the year ended December 31, 2024. Busey did not make any significant loan purchases during the year ended December 31, 2023.

Pledged Loans

Busey has executed a blanket lien with the FHLB. The principal balance of loans Busey has pledged as collateral with the FHLB and Federal Reserve Bank for liquidity, which Busey is able to borrow against, is set forth in the table below:


	As of December 31,
(dollars in thousands)	2025		2024
Pledged loans
FHLB	$	5,051,512	$	4,813,600
Federal Reserve Bank	1,854,423		765,824
Total pledged loans	$	6,905,935	$	5,579,424

Risk Grading

Busey utilizes a loan grading scale to assign a risk grade to all of its loans. A description of the general characteristics of each grade is as follows:

•Pass – This category includes loans that are all considered acceptable credits, ranging from investment or near investment grade, to loans made to borrowers who exhibit credit fundamentals that meet or exceed industry standards.

•Watch – This category includes loans that warrant a higher-than-average level of monitoring to ensure that weaknesses do not cause the inability of the credit to perform as expected. These loans are not necessarily a problem due to other inherent strengths of the credit, such as guarantor strength, but have above average concern and monitoring.

•Special mention – This category is for “Other Assets Specially Mentioned” loans that have potential weaknesses, which may, if not checked or corrected, weaken the asset, or inadequately protect Busey’s credit position at some future date.

•Substandard – This category includes “Substandard” loans, determined in accordance with regulatory guidelines, for which the accrual of interest has not been stopped. Assets so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that Busey will sustain some loss if the deficiencies are not corrected.

•Substandard non-accrual – This category includes loans that have all the characteristics of a “Substandard” loan with additional factors that make collection in full highly questionable and improbable. Such loans are placed on non-accrual status and may be dependent on collateral with a value that is difficult to determine.

All loans are graded at their inception. Commercial lending relationships that are $2.0 million or less are usually processed through an expedited underwriting process. Most commercial loans greater than $2.0 million are included in a portfolio review at least annually. Commercial loans greater than $0.35 million that have a grading of special mention or worse are typically reviewed on a quarterly basis. Interim reviews may take place if circumstances of the borrower warrant a more frequent review.

The following table is a summary of Busey’s portfolio loans by risk grade:


	As of December 31, 2025
(dollars in thousands)	Pass		Watch		Special Mention		Substandard		Substandard Non-accrual		Total
Commercial loans
C&I and other commercial	$	3,567,589	$	375,113	$	176,814	$	75,394	$	34,298	$	4,229,208
CRE	4,607,134		769,405		140,967		24,680		7,832		5,550,018
Real estate construction	943,065		54,631		24,534		16,786		273		1,039,289
Total commercial loans	9,117,788		1,199,149		342,315		116,860		42,403		10,818,515
Retail loans
Retail real estate	2,106,215		30,674		7,507		1,799		8,421		2,154,616
Retail other	594,294		—		—		—		374		594,668
Total retail loans	2,700,509		30,674		7,507		1,799		8,795		2,749,284
Total portfolio loans	$	11,818,297	$	1,229,823	$	349,822	$	118,659	$	51,198	$	13,567,799


	As of December 31, 2024
(dollars in thousands)	Pass		Watch		Special Mention		Substandard		Substandard Non-accrual		Total
Commercial loans
C&I and other commercial	$	1,545,338	$	281,424	$	36,152	$	37,749	$	3,852	$	1,904,515
CRE	2,744,018		438,945		55,041		16,507		15,053		3,269,564
Real estate construction	345,908		26,833		221		5,224		23		378,209
Total commercial loans	4,635,264		747,202		91,414		59,480		18,928		5,552,288
Retail loans
Retail real estate	1,680,640		9,408		882		2,543		2,984		1,696,457
Retail other	448,166		—		—		—		176		448,342
Total retail loans	2,128,806		9,408		882		2,543		3,160		2,144,799
Total portfolio loans	$	6,764,070	$	756,610	$	92,296	$	62,023	$	22,088	$	7,697,087

Risk grades of portfolio loans and net charge-offs are presented in the tables below by lending activity, further sorted by origination year:


	As of and For The Year Ended December 31, 2025
Risk Grade Ratings	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans		Total
(dollars in thousands)	2025		2024		2023		2022		2021		Prior
C&I and other commercial
Pass	$	833,539	$	486,278	$	342,560	$	207,053	$	178,429	$	122,904	$	1,396,826	$	3,567,589
Watch	21,750		79,853		56,387		38,786		48,624		16,778		112,935		375,113
Special Mention	21,712		11,609		56,578		26,343		5,339		800		54,433		176,814
Substandard	8,336		605		20,444		14,603		9,868		3,655		17,883		75,394
Substandard non-accrual	1,489		3,899		600		10,265		948		4,560		12,537		34,298
Total C&I and other commercial	886,826		582,244		476,569		297,050		243,208		148,697		1,594,614		4,229,208
Gross charge-offs	$	4,667	$	3,332	$	4,347	$	1,450	$	13,591	$	11,456	$	5,716	$	44,559

CRE
Pass	1,077,169		483,950		710,448		1,035,426		740,680		515,631		43,830		4,607,134
Watch	210,673		61,926		119,986		143,072		161,387		69,789		2,572		769,405
Special Mention	49,648		22,642		2,991		13,811		32,109		18,858		908		140,967
Substandard	2,416		679		3,857		4,873		7,316		5,324		215		24,680
Substandard non-accrual	72		—		4,547		—		—		3,213		—		7,832
Total CRE	1,339,978		569,197		841,829		1,197,182		941,492		612,815		47,525		5,550,018
Gross charge-offs	1,297		11,057		—		—		253		—		—		12,607

Real estate construction
Pass	395,019		268,117		107,930		89,673		5,356		2,733		74,237		943,065
Watch	18,571		2,112		3,999		22,561		167		—		7,221		54,631
Special Mention	17,961		—		—		—		6,573		—		—		24,534
Substandard	16,020		—		—		—		766		—		—		16,786
Substandard non-accrual	—		273		—		—		—		—		—		273
Total real estate construction	447,571		270,502		111,929		112,234		12,862		2,733		81,458		1,039,289
Gross charge-offs	—		—		—		—		—		—		—		—

Retail real estate
Pass	93,212		127,475		269,877		446,309		407,851		508,504		252,987		2,106,215
Watch	2,686		569		24,601		1,492		267		482		577		30,674
Special Mention	47		78		4,028		1,454		1,686		—		214		7,507
Substandard	—		—		108		440		484		631		136		1,799
Substandard non-accrual	154		308		128		523		264		2,841		4,203		8,421
Total retail real estate	96,099		128,430		298,742		450,218		410,552		512,458		258,117		2,154,616
Gross charge-offs	1,164		—		—		—		—		51		36		1,251

Retail other
Pass	5,233		2,265		33,349		30,321		4,561		885		517,680		594,294



Substandard non-accrual	—		—		76		134		—		—		164		374
Total retail other	5,233		2,265		33,425		30,455		4,561		885		517,844		594,668
Gross charge-offs	546		147		270		47		—		74		141		1,225

Total portfolio loans	$	2,775,707	$	1,552,638	$	1,762,494	$	2,087,139	$	1,612,675	$	1,277,588	$	2,499,558	$	13,567,799
Total gross charge-offs	$	7,674	$	14,536	$	4,617	$	1,497	$	13,844	$	11,581	$	5,893	$	59,642


	As of and For The Year Ended December 31, 2024
Risk Grade Ratings	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans		Total
(dollars in thousands)	2024		2023		2022		2021		2020		Prior
C&I and other commercial
Pass	$	320,831	$	147,909	$	163,870	$	125,053	$	74,146	$	117,234	$	596,295	$	1,545,338
Watch	38,734		49,394		44,709		16,393		2,175		20,964		109,055		281,424
Special Mention	1,718		2,293		5,658		2,634		106		2,540		21,203		36,152
Substandard	15,186		6,545		788		591		320		2,424		11,895		37,749
Substandard non-accrual	65		141		464		—		42		852		2,288		3,852
Total C&I and other commercial	376,534		206,282		215,489		144,671		76,789		144,014		740,736		1,904,515
Gross charge-offs	$	—	$	14,980	$	148	$	22	$	—	$	303	$	—	$	15,453

CRE
Pass	291,503		354,591		755,266		645,994		356,867		314,340		25,457		2,744,018
Watch	115,078		132,900		60,611		62,408		28,320		38,733		895		438,945
Special Mention	39,252		643		8,020		1,395		4,165		1,517		49		55,041
Substandard	6,983		355		4,628		50		95		4,346		50		16,507
Substandard non-accrual	15,000		39		—		—		14		—		—		15,053
Total CRE	467,816		488,528		828,525		709,847		389,461		358,936		26,451		3,269,564
Gross charge-offs	—		—		—		2,999		—		315		—		3,314

Real estate construction
Pass	159,825		134,450		12,205		24,781		2,213		1,124		11,310		345,908
Watch	20,170		6,455		—		208		—		—		—		26,833
Special Mention	—		—		—		221		—		—		—		221
Substandard	5,224		—		—		—		—		—		—		5,224
Substandard non-accrual	—		—		—		23		—		—		—		23
Total real estate construction	185,219		140,905		12,205		25,233		2,213		1,124		11,310		378,209
Gross charge-offs	—		—		—		—		—		—		—		—

Retail real estate
Pass	101,582		237,306		366,820		354,380		147,236		267,431		205,885		1,680,640
Watch	1,255		550		2,733		3,377		872		124		497		9,408
Special Mention	151		—		344		—		—		372		15		882
Substandard	—		243		1,018		503		—		776		3		2,543
Substandard non-accrual	—		—		344		91		152		1,526		871		2,984
Total retail real estate	102,988		238,099		371,259		358,351		148,260		270,229		207,271		1,696,457
Gross charge-offs	—		—		—		—		—		168		—		168

Retail other
Pass	4,996		55,665		57,944		12,207		2,304		589		314,461		448,166



Substandard non-accrual	—		94		67		4		—		11		—		176
Total retail other	4,996		55,759		58,011		12,211		2,304		600		314,461		448,342
Gross charge-offs	9		31		106		78		4		403		—		631

Total portfolio loans	$	1,137,553	$	1,129,573	$	1,485,489	$	1,250,313	$	619,027	$	774,903	$	1,300,229	$	7,697,087
Total gross charge-offs	$	9	$	15,011	$	254	$	3,099	$	4	$	1,189	$	—	$	19,566

Past Due and Non-Accrual Loans

An analysis of portfolio loans that are past due and still accruing, or on non-accrual status, is presented in the table below:


	As of December 31, 2025
	Loans past due, still accruing						Non-accrual Loans		Non-accrual Loans with No Allowance for Credit Losses
(dollars in thousands)	30-59 Days		60-89 Days		90+Days
Commercial loans
C&I and other commercial	$	3,577	$	593	$	2,128	$	34,298	$	4,612
CRE	484		2,514		—		7,832		1,588
Real estate construction	—		—		—		273		158
Past due and non-accrual commercial loans	4,061		3,107		2,128		42,403		6,358
Retail loans
Retail real estate	2,457		4,280		136		8,421		349
Retail other	2,491		79		24		374		—
Past due and non-accrual retail loans	4,948		4,359		160		8,795		349
Total past due and non-accrual loans	$	9,009	$	7,466	$	2,288	$	51,198	$	6,707


	As of December 31, 2024
	Loans past due, still accruing						Non-accrual Loans		Non-accrual Loans with No Allowance for Credit Losses
(dollars in thousands)	30-59 Days		60-89 Days		90+Days
Commercial loans
C&I and other commercial	$	95	$	—	$	—	$	3,852	$	1,224
CRE	42		2,759		—		15,053		15,000
Real estate construction	41		—		—		23		—
Past due and non-accrual commercial loans	178		2,759		—		18,928		16,224
Retail loans
Retail real estate	3,280		683		1,115		2,984		194
Retail other	1,094		130		34		176		—
Past due and non-accrual retail loans	4,374		813		1,149		3,160		194
Total past due and non-accrual loans	$	4,552	$	3,572	$	1,149	$	22,088	$	16,418

Gross interest income recorded on 90+ days past due loans, and that would have been recorded on non-accrual loans if they had been accruing interest in accordance with their original terms, was $3.0 million, $0.9 million, and $1.1 million for the years ended December 31, 2025, 2024, and 2023, respectively. Interest collected on those loans and recognized on a cash basis that was included in interest income was immaterial for the year ended December 31, 2025, was immaterial for the year ended December 31, 2024, and was $0.4 million for the year ended December 31, 2023.

For additional information about Busey’s accounting policies related to portfolio loans, see “Portfolio Loans” in “Note 1. Significant Accounting Policies.”

Loan Modifications for Borrowers Experiencing Financial Difficulty

The following tables present the amortized cost basis of loans that were modified—specifically in the form of (1) principal forgiveness, (2) an interest rate reduction, (3) an other-than-insignificant payment deferral, and/or (4) a term extension—for borrowers experiencing financial difficulty during the periods indicated, disaggregated by lending activity and the type of modification:


	Year Ended December 31, 2025
(dollars in thousands)	Payment Deferral		Term Extension		% of Total Class of Financing Receivable
Modified Loans
C&I and other commercial	$	10,554	$	22,851	0.8	%
CRE1	939		1,502		—	%
Real estate construction	—		16,020		1.5	%


Total of loans modified during the period2	$	11,493	$	40,373	0.4	%

___________________________________________

1.Modified loans represented an insignificant portion of CRE loans, rounding to zero percent.

2.Modifications included four loans on non-accrual status, and the remaining loans were classified as substandard.


	Year Ended December 31, 2024
(dollars in thousands)	Payment Deferral		Term Extension		% of Total Class of Financing Receivable
Modified Loans
C&I and other commercial	$	325	$	26,175	1.4	%
CRE	—		18,147		0.6	%
Real estate construction	—		5,224		1.4	%


Total of loans modified during the period1	$	325	$	49,546	0.6	%

___________________________________________

1.Modifications included one loan on non-accrual status, and the remaining loans were classified as substandard.

The following table provides, as applicable for loan modifications made during the periods indicated for borrowers experiencing financial difficulty, the weighted average interest rate reductions and weighted average term extensions:

Years Ended December 31,

2025

2024

2023

Weighted Average Term Extension

Weighted Average Interest Rate Reduction

Weighted Average Term Extension

Weighted Average Loan Term Extensions

C&I and other commercial

9 months

1.3 years

—

1.5 years

CRE

11 months

4 months

2.50

1.8 years

Real estate construction

10 months

6 months

—

1.0 year

Aggregate effect

10 months

2.50

1.4 years

Performance of Modified Loans

Busey closely monitors the performance of the loans that are modified for borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. The following table depicts the payment performance of loans modified during the last twelve months:


	As of December 31, 2025
(dollars in thousands)	Current		30-89 Days		90+ Days		Non-accrual
Modified Loans
C&I and other commercial	$	29,684	$	—	$	—	$	3,721
CRE	2,168		273		—		—
Real estate construction	16,020		—		—		—


Loans modified during the last twelve months	$	47,872	$	273	$	—	$	3,721

Busey had commitments of $13.5 million as of December 31, 2025, to lend additional funds to debtors experiencing financial difficulty for whom Busey modified a loan within the past twelve months. Busey did not have any commitments as of December 31, 2024, to lend additional funds to debtors experiencing financial difficulty for whom Busey had modified a loan within the past twelve months.

A default occurs when a loan is 90 days or more past due or transferred to non-accrual status. The following table provides the amortized cost basis of loans that had a payment default during the periods indicated, after having been modified during the 12 months before default for borrowers experiencing financial difficulty:


	Years Ended December 31,
	2025				2024			2023
(dollars in thousands)	Payment Deferral		Term Extension			Term Extension			Term Extension
Loans with Subsequent Defaults
C&I and other commercial	$	460	$	3,261		$	—		$	88
CRE	—		—			15,000			—



Modified loans with subsequent defaults	$	460	$	3,261		$	15,000		$	88

For additional information about Busey’s accounting policies related to loans modified for borrowers experiencing financial difficulty, see “Loan Modifications” in “Note 1. Significant Accounting Policies.”

Collateral Dependent Loans

Management's evaluation as to the ultimate collectability of loans includes estimates regarding future cash flows from operations and the value of property, real and personal, pledged as collateral. These estimates are affected by changing economic conditions and the economic prospects of borrowers. Collateral dependent loans are loans in which repayment is expected to be provided solely by the operation or sale of the underlying collateral and there are no other available and reliable sources of repayment. Loans are written down to the lower of cost or fair value of the underlying collateral, less estimated costs to sell. Busey had $47.8 million and $19.3 million of collateral dependent loans secured by real estate for CRE and retail real estate loans, business assets for C&I and other commercial loans, and vehicles and other personal assets for retail other loans as of December 31, 2025, and December 31, 2024, respectively.

Allowance for Credit Losses

The ACL is a valuation account that is deducted from the portfolio loans’ amortized cost bases to present the net amount expected to be collected on the portfolio loans. The ACL is established through the provision for credit losses charged to income. Portfolio loans are charged-off against the ACL when management believes the uncollectibility of a loan balance is confirmed. Recoveries are recognized up to the aggregate amount of previously charged-off balances.

Management estimates the ACL balance using relevant available information from internal and external sources relating to past events, current conditions, and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. The ACL consists of three components: (1) specific allocations/individual reserves; (2) quantitative reserves; and (3) qualitative reserves.

•Specific allocations/individual reserves – When a loan no longer exhibits risk characteristics that are similar to other loans, that loan is individually evaluated. Individual reserves are calculated for loans that are on a non-accrual status that are greater than a defined dollar threshold or loans that have disparate risk characteristics. Reserves may be based on collateral, for collateral-dependent loans, or on quantitative and qualitative factors, including expected cash flow, market sentiment, and guarantor support.

•Quantitative reserves – Busey implemented a new non-discounted cash flow model in the second quarter of 2025 that uses combined historical loan data from Busey Bank beginning in 2004 and CrossFirst Bank since its inception in 2007. The model incorporates various baseline forecast scenarios and national unemployment rates with either national gross domestic product, the national home price index, or the national commercial real estate price index. Further, prepayment and curtailment expectations are factored into the model. Due to the continued economic uncertainty in the markets in which the Company operates, Busey will continue to utilize a forecast period of 12 months with an immediate reversion to historical loss rates beyond this forecast period in its ACL estimate.

•Qualitative reserves – Busey uses qualitative factors to adjust the historical loss factors for current and forecasted conditions. Busey considers the ten qualitative factors identified in the Interagency Guidance and ASC Topic 326 at each reporting date.

The following table summarizes activity in the ACL attributable to each lending activity. Allocation of a portion of the ACL to one lending activity does not preclude its availability to absorb losses in other lending activities:


(dollars in thousands)	C&I and Other Commercial		CRE		Real Estate Construction		Retail Real Estate		Retail Other		Total
ACL balance, December 31, 2022	$	23,860	$	38,299	$	6,457	$	18,193	$	4,799	$	91,608


Provision for loan losses	(727)		(2,455)		(1,465)		7,922		(876)		2,399
Charged-off	(2,429)		(953)		—		(407)		(629)		(4,418)
Recoveries	552		574		171		590		264		2,151
ACL balance, December 31, 2023	21,256		35,465		5,163		26,298		3,558		91,740
Day 1 PCD1	824		322		—		96		1		1,243
Provision for loan losses	14,455		(318)		(1,885)		(3,031)		(631)		8,590
Charged-off	(15,453)		(3,314)		—		(168)		(631)		(19,566)
Recoveries	507		146		67		516		161		1,397
ACL balance, December 31, 2024	21,589		32,301		3,345		23,711		2,458		83,404
Day 1 PCD1	75,569		21,588		2,112		1,430		84		100,783
Day 2 Provision for loan losses2	22,648		15,104		2,911		1,628		142		42,433
Provision for loan losses	(16,574)		13,677		3,105		3,159		(54)		3,313
Charged-off3	(44,559)		(12,607)		—		(1,251)		(1,225)		(59,642)
Recoveries	2,697		265		95		501		174		3,732
ACL balance, December 31, 2025	$	61,370	$	70,328	$	11,568	$	29,178	$	1,579	$	174,023

__________________________________________

1.The Day 1 PCD was attributable to the M&M acquisition in 2024 and the CrossFirst acquisition in 2025.

2.The Day 2 Provision for loan losses was attributable to the CrossFirst acquisition.

3.Charge-off amounts included $36.8 million for PCD loans assumed in the CrossFirst acquisition.

For additional information about Busey’s accounting policies related to the allowance for credit losses, see “Allowance for Credit Losses” in “Note 1. Significant Accounting Policies.”

SIGNIFICANT ACCOUNTING POLICIES - Securities (Details) $ in Millions	Dec. 31, 2025 USD ($)
Accounting Policies [Abstract]
Debt securities, accrued interest	$ 12.5

INCOME TAXES

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

INCOME TAXES

NOTE 13. INCOME TAXES

Income Tax Expenses

The following table presents components of Busey’s income taxes included in the accompanying Consolidated Statements of Income:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Income taxes
Current expense:
Federal	$	33,596	$	26,696	$	20,139
State	9,708		11,533		14,120
Deferred expense:
Federal	(579)		1,561		(1,557)
State	8,653		(177)		(1,363)
Total income taxes	$	51,378	$	39,613	$	31,339

The following table provides a reconciliation of federal and state income taxes at statutory rates to the income taxes included in the accompanying Consolidated Statements of Income:


	Years Ended December 31,
(dollars in thousands)	2025				2024				2023
Income taxes at federal statutory rate	$	39,194	21.0	%	$	32,194	21.0	%	$	32,320	21.0	%
State and local income taxes (net of federal income tax effect)1	14,470		7.8	%	10,890		7.1	%	10,072		6.5	%
Tax credit investments:
Low income housing tax credits	(7,954)		(4.3)	%	(5,657)		(3.7)	%	(11,243)		(7.3)	%
New markets tax credits	(9,008)		(4.8)	%	(9,474)		(6.2)	%	(2,416)		(1.6)	%
Other credits	(1,589)		(0.9)	%	(883)		(0.6)	%	(1,306)		(0.8)	%
Nontaxable or nondeducitble items:
Tax-exempt interest, net	(2,148)		(1.2)	%	(1,141)		(0.7)	%	(1,493)		(1.0)	%
Compensation	3,079		1.7	%	407		0.3	%	(217)		(0.1)	%
Other nontaxable or nondeductible	546		0.2	%	(381)		(0.3)	%	(793)		(0.5)	%
Other items:
Investment in partnerships	14,692		7.9	%	13,244		8.6	%	5,714		3.7	%
Other	96		0.1	%	414		0.3	%	701		0.5	%
Income taxes and effective income tax rate	$	51,378	27.5	%	$	39,613	25.8	%	$	31,339	20.4	%

___________________________________________

1.State taxes in Illinois for 2025, 2024, and 2023 made up the majority (greater than 50%) of the tax effect in this category.

Deferred Income Taxes

Net deferred taxes, reported in other assets or other liabilities on Busey’s Consolidated Balance Sheets, include the deferred tax assets and liabilities presented in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Deferred taxes
Deferred tax assets:
ACL	$	70,282	$	23,685
Unrealized loss on cash flow hedge	2,744		7,256
Unrealized losses on securities available for sale, net	43,634		61,479
Unrealized losses on securities held to maturity	6,335		8,068
Stock-based compensation	8,089		6,431

Purchase accounting adjustments	3,695		2,076
Accrued vacation	713		493
Lease liabilities	8,016		2,951
Employee costs	12,359		5,725
Tax credits	2,873		—
State net operating loss carryovers	712		—

Other	1,931		—
Deferred tax assets before valuation allowances	161,383		118,164
Valuation allowances	(712)		—
Total deferred tax assets	160,671		118,164

Deferred tax liabilities:

Basis in premises and equipment	(6,716)		(2,419)
Affordable housing partnerships and other investments	(8,920)		(8,011)
Purchase accounting adjustments	(927)		(1,022)
Mortgage servicing assets	(872)		(745)
Basis in core deposit, customer intangible assets, and asset purchase goodwill	(20,427)		(3,325)
Deferred loan origination costs	(1,836)		(3,317)
Right of use assets	(7,427)		(2,835)
Unrealized gain on equity securities	(1,268)		(172)
Other	(900)		(856)
Total deferred tax liabilities	(49,293)		(22,702)

Net deferred tax asset	$	111,378	$	95,462

Management has determined that it is more likely than not that the net deferred tax assets included in the accompanying Consolidated Financial Statements will be fully realized with the exception of Kansas net operating losses acquired as part of the CrossFirst acquisition. Prior to acquisition, CrossFirst generated $20.5 million of Kansas net operating losses from tax years 2019 through 2025, which are indefinitely lived. As of December 31, 2025, Management has determined that it is more likely than not that these net operating losses will not be realized due to the lack of profitability reported by the entities included in the Kansas filing group. Based on this determination, Busey established a $0.7 million valuation allowance against the acquired Kansas state net operating losses for the year ended December 31, 2025. No valuation allowance was required for any deferred tax assets as of December 31, 2024.

Income Tax Payments

Income tax payments by jurisdiction, excluding payments for tax credit investments, are presented in the following table:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Income tax payments by jurisdiction
Federal	$	16,794	$	11,200	$	18,300
Illinois1	*		*		5,240
Other	4,115		1,707		1,868
Total income tax payments	$	20,909	$	12,907	$	25,408

___________________________________________

1.The amount of income taxes paid during the years ended December 31, 2025 and 2024, does not meet the five percent disaggregation threshold.

For additional information about Busey’s accounting policies related to income taxes, see “Income Taxes” in “Note 1. Significant Accounting Policies.”

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477617/942-740-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478822/944-740-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 5: http://www.xbrl.org/2003/role/exampleRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12B

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477891/740-270-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.5.Q1)
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-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
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-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/740/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-14

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-21

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-17

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
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-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

PARENT COMPANY ONLY FINANCIAL INFORMATION - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Unrealized (gains) losses recognized on equity securities, net	$ (4,516)	$ (931)	$ 2,171
Stock-based compensation	17,120	7,726	6,595
(Increase) decrease in other assets	(10,319)	19,752	(17,888)
Increase (decrease) in other liabilities	(27,199)	(8,517)	12,365
Net cash provided by operating activities	192,571	178,267	173,390
Cash flows provided by (used in) investing activities
Purchases of premises and equipment	(19,618)	(6,430)	(9,533)
Net cash provided by investing activities	1,097,564	657,903	550,987
Cash flows provided by (used in) financing activities
Cash paid for withholding taxes on stock-based payments	(5,282)	(1,755)	(1,093)
Cash dividends paid	(90,989)	(54,169)	(53,076)
Proceeds from issuance of treasury stock for the 2021 ESPP	1,845	0	0
Purchase of treasury stock	(69,859)	0	(4,482)
Issuance of preferred stock, net of stock issuance costs	207,447	0	0
Common stock issuance costs	(920)	(141)	0
Net cash used in financing activities	(1,693,742)	(858,092)	(231,960)
Net increase (decrease) in cash and cash equivalents	(403,607)	(21,922)	492,417
Cash and cash equivalents, beginning of period	697,659	719,581	227,164
Cash and cash equivalents, ending of period	294,052	697,659	719,581
Parent Company
Cash flows provided by (used in) operating activities
Net income	135,262	113,691	122,565
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	1,029	1,163	1,038
Distributions more (less) than net income of subsidiaries	(12,762)	(38,625)	(53,487)
Unrealized (gains) losses recognized on equity securities, net	(4,467)	(931)	2,171
Stock-based compensation	17,120	7,726	6,595
(Increase) decrease in other assets	(157)	(8,848)	6,253
Increase (decrease) in other liabilities	(6,166)	365	(7,687)
Net cash provided by operating activities	129,859	74,541	77,448
Cash flows provided by (used in) investing activities
Sales (purchases) of equity securities, net	0	995	0
Net cash received in (paid for) acquisitions	11,832	(14,623)	0
Purchases of premises and equipment	(1,201)	(9)	0
Repayments of investments in subsidiaries	0	0	1,480
Net cash provided by investing activities	10,631	(13,637)	1,480
Cash flows provided by (used in) financing activities
Cash paid for withholding taxes on stock-based payments	(5,282)	(1,755)	(1,093)
Cash dividends paid	(90,989)	(54,169)	(53,076)
Repayments of borrowings	(129,000)	(31,450)	(12,000)
Proceeds from the exercise of stock options and warrants	(452)	(3)	9
Proceeds from issuance of treasury stock for the 2021 ESPP	1,845	0	0
Purchase of treasury stock	(69,859)	0	(4,482)
Issuance of preferred stock, net of stock issuance costs	207,447	0	0
Common stock issuance costs	(920)	(141)	0
Net cash used in financing activities	(87,210)	(87,518)	(70,642)
Net increase (decrease) in cash and cash equivalents	53,280	(26,614)	8,286
Cash and cash equivalents, beginning of period	73,484	100,098	91,812
Cash and cash equivalents, ending of period	$ 126,764	$ 73,484	$ 100,098

GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)
Goodwill and other intangibles assets
Number of operating segments \| segment	3
CrossFirst
Goodwill and other intangibles assets
Goodwill acquired during the period	$ 49.5
Other intangible assets acquired during the period	81.8
M&M
Goodwill and other intangibles assets
Goodwill acquired during the period	$ 0.1	$ 15.8
Other intangible assets acquired during the period		$ 6.3

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A

+ Details

PORTFOLIO LOANS - Schedule of Risk Grades by Portfolio Class (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	$ 13,567,799	$ 7,697,087
Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	11,818,297	6,764,070
Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	1,229,823	756,610
Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	349,822	92,296
Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	118,659	62,023
Substandard Non-accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	51,198	22,088
Commercial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	10,818,515	5,552,288
Commercial loans \| Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	9,117,788	4,635,264
Commercial loans \| Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	1,199,149	747,202
Commercial loans \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	342,315	91,414
Commercial loans \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	116,860	59,480
Commercial loans \| Substandard Non-accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	42,403	18,928
Commercial loans \| C&I and other commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	4,229,208	1,904,515
Commercial loans \| C&I and other commercial \| Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	3,567,589	1,545,338
Commercial loans \| C&I and other commercial \| Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	375,113	281,424
Commercial loans \| C&I and other commercial \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	176,814	36,152
Commercial loans \| C&I and other commercial \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	75,394	37,749
Commercial loans \| C&I and other commercial \| Substandard Non-accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	34,298	3,852
Commercial loans \| CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	5,550,018	3,269,564
Commercial loans \| CRE \| Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	4,607,134	2,744,018
Commercial loans \| CRE \| Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	769,405	438,945
Commercial loans \| CRE \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	140,967	55,041
Commercial loans \| CRE \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	24,680	16,507
Commercial loans \| CRE \| Substandard Non-accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	7,832	15,053
Commercial loans \| Real estate construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	1,039,289	378,209
Commercial loans \| Real estate construction \| Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	943,065	345,908
Commercial loans \| Real estate construction \| Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	54,631	26,833
Commercial loans \| Real estate construction \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	24,534	221
Commercial loans \| Real estate construction \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	16,786	5,224
Commercial loans \| Real estate construction \| Substandard Non-accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	273	23
Retail loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	2,749,284	2,144,799
Retail loans \| Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	2,700,509	2,128,806
Retail loans \| Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	30,674	9,408
Retail loans \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	7,507	882
Retail loans \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	1,799	2,543
Retail loans \| Substandard Non-accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	8,795	3,160
Retail loans \| CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	2,154,616	1,696,457
Retail loans \| CRE \| Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	2,106,215	1,680,640
Retail loans \| CRE \| Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	30,674	9,408
Retail loans \| CRE \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	7,507	882
Retail loans \| CRE \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	1,799	2,543
Retail loans \| CRE \| Substandard Non-accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	8,421	2,984
Retail loans \| Retail other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	594,668	448,342
Retail loans \| Retail other \| Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	594,294	448,166
Retail loans \| Retail other \| Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	0	0
Retail loans \| Retail other \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	0	0
Retail loans \| Retail other \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	0	0
Retail loans \| Retail other \| Substandard Non-accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total portfolio loans	$ 374	$ 176

SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangibles (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Goodwill impairment	$ 0	$ 0

- Definition

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References + Details

DEBT SECURITIES (Tables)

12 Months Ended

Dec. 31, 2025

Investments, Debt and Equity Securities [Abstract]

Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM

The tables below provide the amortized cost, unrealized or unrecognized gains and losses, and fair values of debt securities, summarized by major category:


	As of December 31, 2025
	Amortized Cost		Unrealized				Fair Value
(dollars in thousands)			Gross Gains		Gross Losses
Debt securities available for sale1

Obligations of U.S. government corporations and agencies	$	111,876	$	250	$	(80)	$	112,046
Obligations of states and political subdivisions	270,682		3,089		(9,898)		263,873
Asset-backed securities	265,203		412		(35)		265,580
Commercial mortgage-backed securities	143,522		611		(11,191)		132,942
Residential mortgage-backed securities	1,464,347		9,336		(129,267)		1,344,416
Corporate debt securities	45,215		187		(1,711)		43,691
Total debt securities available for sale	$	2,300,845	$	13,885	$	(152,182)	$	2,162,548



	Amortized Cost		Unrecognized				Fair Value
			Gross Gains		Gross Losses
Debt securities held to maturity
Commercial mortgage-backed securities	$	367,825	$	—	$	(65,210)	$	302,615
Residential mortgage-backed securities	378,560		—		(55,218)		323,342
Total debt securities held to maturity	$	746,385	$	—	$	(120,428)	$	625,957

___________________________________________

1.Includes securities marked at par, with no gain or loss to report.


	As of December 31, 2024
	Amortized Cost		Unrealized				Fair Value
(dollars in thousands)			Gross Gains		Gross Losses
Debt securities available for sale1

Obligations of U.S. government corporations and agencies	$	1,408	$	—	$	(8)	$	1,400
Obligations of states and political subdivisions	156,534		31		(16,736)		139,829
Asset-backed securities	336,379		181		(3)		336,557
Commercial mortgage-backed securities	107,305		—		(15,131)		92,174
Residential mortgage-backed securities	1,279,090		19		(191,899)		1,087,210
Corporate debt securities	159,236		363		(6,548)		153,051
Total debt securities available for sale	$	2,039,952	$	594	$	(230,325)	$	1,810,221



	Amortized Cost		Unrecognized				Fair Value
			Gross Gains		Gross Losses
Debt securities held to maturity
Commercial mortgage-backed securities	$	415,530	$	—	$	(77,242)	$	338,288
Residential mortgage-backed securities	411,100		—		(74,335)		336,765
Total debt securities held to maturity	$	826,630	$	—	$	(151,577)	$	675,053

___________________________________________

1.Includes securities marked at par, with no gain or loss to report.

Schedule of Maturities Of Debt Securities

All mortgage-backed securities were issued by U.S. government corporations and agencies.


	As of December 31, 2025
(dollars in thousands)	Amortized Cost		Fair Value
Debt securities available for sale
Due in one year or less	$	10,725	$	10,684
Due after one year through five years	66,180		63,335
Due after five years through ten years	371,411		355,748
Due after ten years	1,852,529		1,732,781
Debt securities available for sale	$	2,300,845	$	2,162,548

Debt securities held to maturity
Due in one year or less	$	20,000	$	19,896
Due after one year through five years	37,076		35,836

Due after ten years	689,309		570,225
Debt securities held to maturity	$	746,385	$	625,957

Schedule of Gains and Losses on Debt Securities Available for Sale

Realized gains and losses related to sales and calls of debt securities available for sale are summarized as follows:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Realized gains and losses on debt securities
Gross gains on debt securities	$	321	$	1	$	20
Gross (losses) on debt securities1	(15,563)		(7,034)		(5,523)
Realized net gains (losses) on debt securities2	$	(15,242)	$	(7,033)	$	(5,503)

___________________________________________

1.During the first quarter of 2025, Busey sold available for sale debt securities with a book value of approximately $205.6 million for a pre-tax loss of $15.5 million and related estimated tax benefit of $4.3 million, as part of a balance sheet repositioning strategy. During the first quarter of 2024, Busey sold available for sale debt securities with a book value of approximately $108.2 million for a pre-tax loss of $6.8 million and related estimated tax benefit of $1.8 million, as part of a balance sheet repositioning strategy.

2.Net gains (losses) on sales of securities reported on the Consolidated Statements of Income include, as applicable, the sale of equity securities, which are excluded in this table.

Schedule of Debt Securities in an Unrealized or Unrecognized Loss Position

The following information pertains to debt securities with gross unrealized or unrecognized losses, aggregated by investment category and the length of time that individual securities have been in a continuous loss position:


	As of December 31, 2025
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Debt securities available for sale

Obligations of U.S. government corporations and agencies	$	39,156	$	(80)	$	—	$	—	$	39,156	$	(80)
Obligations of states and political subdivisions	28,592		(361)		92,205		(9,537)		120,797		(9,898)
Asset-backed securities	10,005		(35)		—		—		10,005		(35)
Commercial mortgage-backed securities	4,986		(48)		71,830		(11,143)		76,816		(11,191)
Residential mortgage-backed securities	84,023		(708)		765,361		(128,559)		849,384		(129,267)
Corporate debt securities	5,969		(20)		29,097		(1,691)		35,066		(1,711)
Debt securities available for sale with gross unrealized losses	$	172,731	$	(1,252)	$	958,493	$	(150,930)	$	1,131,224	$	(152,182)



	12 months or more			Total
		Fair Value		Unrecognized Losses		Fair Value		Unrecognized Losses
Debt securities held to maturity
Commercial mortgage-backed securities		$	302,615	$	(65,210)	$	302,615	$	(65,210)
Residential mortgage-backed securities		323,342		(55,218)		323,342		(55,218)
Debt securities held to maturity with gross unrecognized losses		$	625,957	$	(120,428)	$	625,957	$	(120,428)


	As of December 31, 2024
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Debt securities available for sale

Obligations of U.S. government corporations and agencies	$	—	$	—	$	1,328	$	(8)	$	1,328	$	(8)
Obligations of states and political subdivisions	11,234		(209)		119,723		(16,527)		130,957		(16,736)
Asset-backed securities	14,997		(3)		—		—		14,997		(3)
Commercial mortgage-backed securities	6,238		(42)		85,936		(15,089)		92,174		(15,131)
Residential mortgage-backed securities	152,081		(640)		930,642		(191,259)		1,082,723		(191,899)
Corporate debt securities	598		(1)		143,966		(6,547)		144,564		(6,548)
Debt securities available for sale with gross unrealized losses	$	185,148	$	(895)	$	1,281,595	$	(229,430)	$	1,466,743	$	(230,325)



	12 months or more			Total
		Fair Value		Unrecognized Losses		Fair Value		Unrecognized Losses
Debt securities held to maturity
Commercial mortgage-backed securities		$	338,288	$	(77,242)	$	338,288	$	(77,242)
Residential mortgage-backed securities		336,765		(74,335)		336,765		(74,335)
Debt securities held to maturity with gross unrecognized losses		$	675,053	$	(151,577)	$	675,053	$	(151,577)

Additional information about debt securities in an unrealized or unrecognized loss position is presented in the tables below:


	As of December 31, 2025
(dollars in thousands)	Available for Sale			Held to Maturity			Total
Debt securities with gross unrealized or unrecognized losses, fair value	$	1,131,224		$	625,957		$	1,757,181
Gross unrealized or unrecognized losses on debt securities	152,182			120,428			272,610
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	13.5		%	19.2		%	15.5		%

Count of debt securities	637			52			689
Count of debt securities in an unrealized or unrecognized loss position	376			52			428


	As of December 31, 2024
(dollars in thousands)	Available for Sale			Held to Maturity			Total
Debt securities with gross unrealized or unrecognized losses, fair value	$	1,466,743		$	675,053		$	2,141,796
Gross unrealized or unrecognized losses on debt securities	230,325			151,577			381,902
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	15.7		%	22.5		%	17.8		%

Count of debt securities	677			55			732
Count of debt securities in an unrealized or unrecognized loss position	586			55			641

FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Details) $ in Thousands	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Fair Value
OREO and other repossessed assets with subsequent impairment	$ 700	$ 63
Fair Value, Nonrecurring
Fair Value
Loans evaluated individually, net of related allowance	19,604	616
Bank property held for sale with impairment	1,855	2,841
Fair Value, Nonrecurring \| OREO and other repossessed assets with subsequent impairment
Fair Value
OREO and other repossessed assets with subsequent impairment	4,409
Level 3 Inputs \| Fair Value, Nonrecurring
Fair Value
Loans evaluated individually, net of related allowance	19,604	616
Bank property held for sale with impairment	1,855	2,841
Level 3 Inputs \| Fair Value, Nonrecurring \| OREO and other repossessed assets with subsequent impairment
Fair Value
OREO and other repossessed assets with subsequent impairment	4,409
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral
Fair Value
Loans evaluated individually, net of related allowance	19,604	$ 616
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral \| OREO and other repossessed assets with subsequent impairment
Fair Value
OREO and other repossessed assets with subsequent impairment	$ 4,409
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral \| Minimum \| Measurement Input, Comparability Adjustment
Range (Weighted Average)
Loans evaluated individually, net of related allowance	(0.016)	(0.250)
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral \| Minimum \| Measurement Input, Comparability Adjustment \| OREO and other repossessed assets with subsequent impairment
Range (Weighted Average)
OREO and other repossessed assets with subsequent impairment	(0.028)
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral \| Maximum \| Measurement Input, Comparability Adjustment
Range (Weighted Average)
Loans evaluated individually, net of related allowance	(1.000)	(1.000)
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral \| Maximum \| Measurement Input, Comparability Adjustment \| OREO and other repossessed assets with subsequent impairment
Range (Weighted Average)
OREO and other repossessed assets with subsequent impairment	(0.241)
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral \| Weighted Average \| Measurement Input, Comparability Adjustment
Range (Weighted Average)
Loans evaluated individually, net of related allowance	(0.446)	(0.749)
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral \| Weighted Average \| Measurement Input, Comparability Adjustment \| OREO and other repossessed assets with subsequent impairment
Range (Weighted Average)
OREO and other repossessed assets with subsequent impairment	(0.045)
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral or real estate listing price
Fair Value
Bank property held for sale with impairment	$ 1,855	$ 2,841
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral or real estate listing price \| Minimum \| Measurement Input, Comparability Adjustment
Range (Weighted Average)
Bank property held for sale with impairment	(0.090)	(0.090)
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral or real estate listing price \| Maximum \| Measurement Input, Comparability Adjustment
Range (Weighted Average)
Bank property held for sale with impairment	(0.580)	(0.767)
Level 3 Inputs \| Fair Value, Nonrecurring \| Appraisal of collateral or real estate listing price \| Weighted Average \| Measurement Input, Comparability Adjustment
Range (Weighted Average)
Bank property held for sale with impairment	(0.394)	(0.518)

OTHER REAL ESTATE OWNED AND OTHER REPOSSESSED ASSETS - Schedule of Expenses Related to OREO and Other Repossessed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Operating income (expense), net	$ 38	$ (17)	$ (67)
Net gain (loss) on sales	302	585	46
Impairment expense	(422)	0	(100)
Income from (expense for) OREO and other repossessed assets	$ (82)	$ 568	$ (121)

EARNINGS PER COMMON SHARE - Schedule of Computation of Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net income per share calculations for basic and diluted methods
Net income available to common stockholders	$ 125,386	$ 113,691	$ 122,565
Weighted Average Shares Outstanding
Weighted average number of common shares outstanding, basic (in shares)	84,007,614	56,610,032	55,432,322
Weighted average number of common shares outstanding, diluted (in shares)	85,133,626	57,543,001	56,256,148
Basic earnings per common share (in dollars per share)	$ 1.49	$ 2.01	$ 2.21
Diluted earnings per common share (in dollars per share)	$ 1.47	$ 1.98	$ 2.18
Options
Weighted Average Shares Outstanding
Dilutive effect of common stock equivalents (in shares)	47	753	0
Warrants
Weighted Average Shares Outstanding
Dilutive effect of common stock equivalents (in shares)	0	0	324
SSARs
Weighted Average Shares Outstanding
Dilutive effect of common stock equivalents (in shares)	188,571	0	0
RSU awards
Weighted Average Shares Outstanding
Dilutive effect of common stock equivalents (in shares)	822,771	662,341	647,217
PSU awards
Weighted Average Shares Outstanding
Dilutive effect of common stock equivalents (in shares)	85,022	243,166	151,190
DSU awards
Weighted Average Shares Outstanding
Dilutive effect of common stock equivalents (in shares)	18,335	19,956	18,154
ESPP
Weighted Average Shares Outstanding
Dilutive effect of common stock equivalents (in shares)	11,266	6,753	6,941

OTHER REAL ESTATE OWNED AND OTHER REPOSSESSED ASSETS - Schedule of Activity Related to OREO and Other Repossessed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Other Real Estate [Roll Forward]
OREO and other repossessed assets at January 1	$ 63	$ 125	$ 850
Additions, transfers from loans and assumed in acquisitions	26,641	26	189
Sales	(21,233)	(84)	(770)
Cash payments (collected) paid	(423)	(4)	(44)
Impairment	(422)	0	(100)
OREO and other repossessed assets at December 31	$ 4,626	$ 63	$ 125

DEPOSITS (Tables)

12 Months Ended

Dec. 31, 2025

Deposits [Abstract]

Schedule of Composition of Deposits

The composition of Busey’s deposits is presented in the table below:


	As of December 31,
(dollars in thousands)	2025		2024
Deposits
Noninterest-bearing demand deposits	$	3,659,421	$	2,719,907
Interest-bearing transaction deposits	3,119,475		2,423,237
Saving deposits and money market deposits	5,697,172		3,348,711
Time deposits	2,429,890		1,490,635
Total deposits	$	14,905,958	$	9,982,490

Additional information about Busey’s deposits is presented in the table below:


	As of December 31,
(dollars in thousands)	2025		2024
Brokered interest-bearing transaction deposits	$	50,136	$	—
Brokered savings deposits and money market deposits	10,000		6,002
Brokered time deposits	10,004		7,088
Total time deposits with a minimum denomination of $100,000	1,674,862		860,193
Total time deposits with a minimum denomination that meets or exceeds the FDIC insurance limit of $250,000	876,207		334,503

Schedule of Maturities of Time Deposits

Scheduled maturities of time deposits are presented in the table below:


(dollars in thousands)	As of December 31, 2025
Time deposits by schedule of maturities

2026	$	2,364,343
2027	46,913
2028	10,952
2029	4,593
2030	2,667
Thereafter	422
Time deposits	$	2,429,890

OUTSTANDING COMMITMENTS AND CONTINGENT LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

Schedule of Contractual Amount of Exposure to Off-Balance-Sheet Risk

A summary of the contractual amount of Busey’s exposure to off-balance-sheet risk relating to the Company’s commitments to extend credit and standby letters of credit follows:


	As of December 31,
(dollars in thousands)	2025		2024
Off-Balance Sheet Commitments
Commitments to extend credit	$	4,696,867	$	2,512,714
Standby letters of credit	123,746		35,464
Total commitments	$	4,820,613	$	2,548,178

PORTFOLIO LOANS - Schedule of Risk Grades of Portfolio Loans, Further Sorted by Origination (CY) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 2,775,707	$ 1,137,553
2025 charge-off	7,674	9
2024	1,552,638	1,129,573
2024 charge-off	14,536	15,011
2023	1,762,494	1,485,489
2023 charge-off	4,617	254
2022	2,087,139	1,250,313
2022 charge-off	1,497	3,099
2021	1,612,675	619,027
2021 charge-off	13,844	4
Prior	1,277,588	774,903
Prior, charge-off	11,581	1,189
Revolving Loans	2,499,558	1,300,229
Revolving Loans, charge-off	5,893	0
Total	13,567,799	7,697,087
Total, gross write-offs	59,642	19,566
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	11,818,297	6,764,070
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,229,823	756,610
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	349,822	92,296
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	118,659	62,023
Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	51,198	22,088
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	10,818,515	5,552,288
Commercial loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	9,117,788	4,635,264
Commercial loans \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,199,149	747,202
Commercial loans \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	342,315	91,414
Commercial loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	116,860	59,480
Commercial loans \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	42,403	18,928
Commercial loans \| C&I and other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2025	886,826	376,534
2025 charge-off	4,667	0
2024	582,244	206,282
2024 charge-off	3,332	14,980
2023	476,569	215,489
2023 charge-off	4,347	148
2022	297,050	144,671
2022 charge-off	1,450	22
2021	243,208	76,789
2021 charge-off	13,591	0
Prior	148,697	144,014
Prior, charge-off	11,456	303
Revolving Loans	1,594,614	740,736
Revolving Loans, charge-off	5,716	0
Total	4,229,208	1,904,515
Total, gross write-offs	44,559	15,453
Commercial loans \| C&I and other commercial \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2025	833,539	320,831
2024	486,278	147,909
2023	342,560	163,870
2022	207,053	125,053
2021	178,429	74,146
Prior	122,904	117,234
Revolving Loans	1,396,826	596,295
Total	3,567,589	1,545,338
Commercial loans \| C&I and other commercial \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2025	21,750	38,734
2024	79,853	49,394
2023	56,387	44,709
2022	38,786	16,393
2021	48,624	2,175
Prior	16,778	20,964
Revolving Loans	112,935	109,055
Total	375,113	281,424
Commercial loans \| C&I and other commercial \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2025	21,712	1,718
2024	11,609	2,293
2023	56,578	5,658
2022	26,343	2,634
2021	5,339	106
Prior	800	2,540
Revolving Loans	54,433	21,203
Total	176,814	36,152
Commercial loans \| C&I and other commercial \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2025	8,336	15,186
2024	605	6,545
2023	20,444	788
2022	14,603	591
2021	9,868	320
Prior	3,655	2,424
Revolving Loans	17,883	11,895
Total	75,394	37,749
Commercial loans \| C&I and other commercial \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2025	1,489	65
2024	3,899	141
2023	600	464
2022	10,265	0
2021	948	42
Prior	4,560	852
Revolving Loans	12,537	2,288
Total	34,298	3,852
Commercial loans \| CRE
Financing Receivable, Credit Quality Indicator [Line Items]
2025	1,339,978	467,816
2025 charge-off	1,297	0
2024	569,197	488,528
2024 charge-off	11,057	0
2023	841,829	828,525
2023 charge-off	0	0
2022	1,197,182	709,847
2022 charge-off	0	2,999
2021	941,492	389,461
2021 charge-off	253	0
Prior	612,815	358,936
Prior, charge-off	0	315
Revolving Loans	47,525	26,451
Revolving Loans, charge-off	0	0
Total	5,550,018	3,269,564
Total, gross write-offs	12,607	3,314
Commercial loans \| CRE \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2025	1,077,169	291,503
2024	483,950	354,591
2023	710,448	755,266
2022	1,035,426	645,994
2021	740,680	356,867
Prior	515,631	314,340
Revolving Loans	43,830	25,457
Total	4,607,134	2,744,018
Commercial loans \| CRE \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2025	210,673	115,078
2024	61,926	132,900
2023	119,986	60,611
2022	143,072	62,408
2021	161,387	28,320
Prior	69,789	38,733
Revolving Loans	2,572	895
Total	769,405	438,945
Commercial loans \| CRE \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2025	49,648	39,252
2024	22,642	643
2023	2,991	8,020
2022	13,811	1,395
2021	32,109	4,165
Prior	18,858	1,517
Revolving Loans	908	49
Total	140,967	55,041
Commercial loans \| CRE \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2025	2,416	6,983
2024	679	355
2023	3,857	4,628
2022	4,873	50
2021	7,316	95
Prior	5,324	4,346
Revolving Loans	215	50
Total	24,680	16,507
Commercial loans \| CRE \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2025	72	15,000
2024	0	39
2023	4,547	0
2022	0	0
2021	0	14
Prior	3,213	0
Revolving Loans	0	0
Total	7,832	15,053
Commercial loans \| Real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
2025	447,571	185,219
2025 charge-off	0	0
2024	270,502	140,905
2024 charge-off	0	0
2023	111,929	12,205
2023 charge-off	0	0
2022	112,234	25,233
2022 charge-off	0	0
2021	12,862	2,213
2021 charge-off	0	0
Prior	2,733	1,124
Prior, charge-off	0	0
Revolving Loans	81,458	11,310
Revolving Loans, charge-off	0	0
Total	1,039,289	378,209
Total, gross write-offs	0	0
Commercial loans \| Real estate construction \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2025	395,019	159,825
2024	268,117	134,450
2023	107,930	12,205
2022	89,673	24,781
2021	5,356	2,213
Prior	2,733	1,124
Revolving Loans	74,237	11,310
Total	943,065	345,908
Commercial loans \| Real estate construction \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2025	18,571	20,170
2024	2,112	6,455
2023	3,999	0
2022	22,561	208
2021	167	0
Prior	0	0
Revolving Loans	7,221	0
Total	54,631	26,833
Commercial loans \| Real estate construction \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2025	17,961	0
2024	0	0
2023	0	0
2022	0	221
2021	6,573	0
Prior	0	0
Revolving Loans	0	0
Total	24,534	221
Commercial loans \| Real estate construction \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2025	16,020	5,224
2024	0	0
2023	0	0
2022	0	0
2021	766	0
Prior	0	0
Revolving Loans	0	0
Total	16,786	5,224
Commercial loans \| Real estate construction \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	273	0
2023	0	0
2022	0	23
2021	0	0
Prior	0	0
Revolving Loans	0	0
Total	273	23
Retail loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,749,284	2,144,799
Retail loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,700,509	2,128,806
Retail loans \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Total	30,674	9,408
Retail loans \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,507	882
Retail loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,799	2,543
Retail loans \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	8,795	3,160
Retail loans \| CRE
Financing Receivable, Credit Quality Indicator [Line Items]
2025	96,099	102,988
2025 charge-off	1,164	0
2024	128,430	238,099
2024 charge-off	0	0
2023	298,742	371,259
2023 charge-off	0	0
2022	450,218	358,351
2022 charge-off	0	0
2021	410,552	148,260
2021 charge-off	0	0
Prior	512,458	270,229
Prior, charge-off	51	168
Revolving Loans	258,117	207,271
Revolving Loans, charge-off	36	0
Total	2,154,616	1,696,457
Total, gross write-offs	1,251	168
Retail loans \| CRE \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2025	93,212	101,582
2024	127,475	237,306
2023	269,877	366,820
2022	446,309	354,380
2021	407,851	147,236
Prior	508,504	267,431
Revolving Loans	252,987	205,885
Total	2,106,215	1,680,640
Retail loans \| CRE \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2025	2,686	1,255
2024	569	550
2023	24,601	2,733
2022	1,492	3,377
2021	267	872
Prior	482	124
Revolving Loans	577	497
Total	30,674	9,408
Retail loans \| CRE \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2025	47	151
2024	78	0
2023	4,028	344
2022	1,454	0
2021	1,686	0
Prior	0	372
Revolving Loans	214	15
Total	7,507	882
Retail loans \| CRE \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	243
2023	108	1,018
2022	440	503
2021	484	0
Prior	631	776
Revolving Loans	136	3
Total	1,799	2,543
Retail loans \| CRE \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2025	154	0
2024	308	0
2023	128	344
2022	523	91
2021	264	152
Prior	2,841	1,526
Revolving Loans	4,203	871
Total	8,421	2,984
Retail loans \| Retail other
Financing Receivable, Credit Quality Indicator [Line Items]
2025	5,233	4,996
2025 charge-off	546	9
2024	2,265	55,759
2024 charge-off	147	31
2023	33,425	58,011
2023 charge-off	270	106
2022	30,455	12,211
2022 charge-off	47	78
2021	4,561	2,304
2021 charge-off	0	4
Prior	885	600
Prior, charge-off	74	403
Revolving Loans	517,844	314,461
Revolving Loans, charge-off	141	0
Total	594,668	448,342
Total, gross write-offs	1,225	631
Retail loans \| Retail other \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2025	5,233	4,996
2024	2,265	55,665
2023	33,349	57,944
2022	30,321	12,207
2021	4,561	2,304
Prior	885	589
Revolving Loans	517,680	314,461
Total	594,294	448,166
Retail loans \| Retail other \| Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Retail loans \| Retail other \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Retail loans \| Retail other \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Retail loans \| Retail other \| Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	94
2023	76	67
2022	134	4
2021	0	0
Prior	0	11
Revolving Loans	164	0
Total	$ 374	$ 176

DEPOSITS - Schedule of Maturities of Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Time deposits by schedule of maturities
2026	$ 2,364,343
2027	46,913
2028	10,952
2029	4,593
2030	2,667
Thereafter	422
Time deposits	$ 2,429,890	$ 1,490,635

BUSINESS COMBINATIONS

12 Months Ended

Dec. 31, 2025

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

BUSINESS COMBINATIONS

NOTE 2. BUSINESS COMBINATIONS

CrossFirst Bankshares, Inc.

On March 1, 2025, Busey completed its acquisition of CrossFirst (NASDAQ: CFB), the holding company for CrossFirst Bank, pursuant to an Agreement and Plan of Merger, dated August 26, 2024, by and between Busey and CrossFirst (the “CrossFirst Merger Agreement”). This partnership creates a premier commercial bank spanning 10 states—Illinois, Missouri, Texas, Colorado, Florida, Kansas, Oklahoma, Arizona, Indiana, and New Mexico. The combined holding company continues to operate under the First Busey Corporation name. Busey’s common stock continues to trade on the Nasdaq under the “BUSE” stock ticker symbol.

Merger of CrossFirst Bank into Busey Bank

CrossFirst Bank’s results of operations were included in Busey’s consolidated results of operations beginning March 1, 2025. Busey operated CrossFirst Bank as a separate banking subsidiary until it was merged with and into Busey Bank on June 20, 2025. At the time of the bank merger, CrossFirst Bank’s banking centers became banking centers of Busey Bank.

Merger Consideration for CrossFirst

Upon completion of the acquisition, each share of CrossFirst common stock converted into the right to receive 0.6675 of a share of Busey’s common stock. Cash was paid in lieu of fractional shares. The fair value of common shares issued in consideration of the CrossFirst acquisition was based on the closing price of Busey’s common stock on February 28, 2025.

Further, upon completion of the acquisition, each share of CrossFirst Series A Non-Cumulative Perpetual Preferred Stock converted to the right to receive one share of Busey Series A Non-Cumulative Perpetual Preferred Stock. The fair value of Busey Series A Non-Cumulative Perpetual Preferred Stock was based on the redemption price of $1,000 per share.

The total consideration paid also included the fair value of replacement equity awards related to past service totaling $6.0 million. Busey used a Monte Carlo simulation to estimate the fair value of SSARs and market-based awards. Other awards were valued based on Busey’s closing stock price on February 28, 2025.

Acquisition Accounting for CrossFirst

The CrossFirst acquisition was accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration exchanged were recorded at estimated fair values as of March 1, 2025, the date of acquisition. Subsequent to the acquisition, as additional information and valuations became available, fair value adjustments were recorded, resulting in a $1.9 million increase to the fair value of net assets acquired. Estimated fair values are considered provisional until final fair values are determined or the measurement period has passed, but no later than one year from the acquisition date. Deferred taxes are considered provisional until the measurement period is closed. Other than this, Busey does not expect any further adjustments will be necessary.

As the total consideration paid for CrossFirst exceeded the estimated fair value of net assets acquired, goodwill of $49.5 million was recorded as a result of the acquisition. Goodwill recorded for this transaction reflects synergies expected from the acquisition and the greater revenue opportunities from Busey’s broader service capabilities in attractive new markets. Goodwill recorded for this transaction is not tax deductible and was assigned to the Banking operating segment.

Merchants and Manufacturers Bank Corporation

On April 1, 2024, Busey completed its acquisition of M&M and its wholly-owned subsidiary, M&M Bank, through a merger transaction. This partnership added M&M’s Life Equity Loan® products to Busey’s existing suite of services and expanded Busey’s presence in the suburban Chicago market.

Merger of M&M Bank into Busey Bank

M&M’s results of operations were included in Busey’s consolidated results of operation beginning April 1, 2024. Busey operated M&M Bank as a separate banking subsidiary until it was merged with Busey Bank on June 21, 2024. At the time of the bank merger, M&M Bank’s banking centers became banking centers of Busey Bank, except for M&M’s banking center located at 990 Essington Rd., Joliet, Illinois, which was closed in connection with the bank merger.

Merger Consideration for M&M

At the effective time of the M&M acquisition, each share of M&M common stock converted to the right to receive, at the election of each stockholder and subject to proration and adjustment as provided in the M&M merger agreement, either (1) $117.74 in cash (“Cash Election”), (2) 5.7294 shares of Busey common stock (“Share Election”), or (3) mixed consideration of $34.55 in cash and 4.0481 shares of Busey common stock (“Mixed Election”).

Most of the M&M common stockholders who submitted an election form by the election deadline made the Share Election to receive their Merger consideration solely in the form of shares of Busey common stock. As a result of the elections of M&M common stockholders, and in accordance with the proration and adjustment provisions of the Merger Agreement, the Merger consideration paid to M&M common stockholders was comprised of an aggregate of 1,429,304 shares of Busey common stock and an aggregate of $12.2 million in cash, allocated as follows for each share of M&M stock: (1) $117.74 in cash for the Cash Election, (2) $5.3966 in cash and 5.4668 shares of Busey common stock for the Share Election, and (3) $34.55 in cash and 4.0481 shares of Busey common stock for the Mixed Election. Pursuant to the terms of the Merger Agreement, M&M common stockholders that did not make an election or submit a properly completed election form by the election deadline of March 29, 2024, received cash consideration of $117.74 for each share of M&M common stock held. No fractional shares of Busey common stock were issued in the M&M acquisition. Fractional shares were paid in cash at the rate of $23.32 per share.

Additional merger consideration of $3.0 million was paid to redeem 300 shares of M&M preferred stock.

Acquisition Accounting for M&M

The M&M acquisition was accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration exchanged were recorded at estimated fair values on April 1, 2024, the date of acquisition. Fair values, including initial accounting for deferred taxes, were subject to refinement for up to one year after the closing date as additional information regarding the closing date fair values became available. Fair value adjustments representing a $0.4 million decrease in net assets acquired were recorded during the year ended December 31, 2024, as additional information became available regarding unrecorded assets and liabilities. A final fair value adjustment for deferred taxes was recorded during the three months ended March 31, 2025, resulting in an additional $0.1 million decrease in net assets acquired. Fair values were final as of March 31, 2025.

As the total consideration paid for M&M exceeded the estimated fair value of net assets acquired, goodwill of $15.9 million was recorded as a result of the acquisition. Goodwill recorded for this transaction reflects synergies expected from the acquisition and expansion within the Chicago metropolitan market. Goodwill recorded for this transaction is not tax deductible and was assigned to the Banking operating segment.

Acquisition Date Fair Values

Acquisition-date fair values of the assets acquired and liabilities assumed, as well as the fair value of consideration transferred, were estimated as follows:


	March 1, 2025		April 1, 2024
(dollars in thousands)	CrossFirst (provisional)		M&M (final)
Assets acquired
Cash and cash equivalents	$	385,808	$	33,577
Securities	725,622		8,086
Portfolio loans, net of ACL	6,023,063		417,230
Premises and equipment	69,673		2,045

Other intangible assets1	81,783		6,346
Other assets	212,440		10,461
Total assets acquired	7,498,389		477,745

Liabilities assumed
Deposits	6,571,699		392,838
Short-term borrowings	11,148		35,932
Long-term borrowings	68,922		1,450
Subordinated notes, net of unamortized issuance costs	—		3,911
Junior subordinated debt owed to unconsolidated trusts	2,238		2,594

Other liabilities	84,912		7,342
Total liabilities assumed	6,738,919		444,067

Net assets acquired	$	759,470	$	33,678

Consideration paid
Cash	$	4	$	15,200
Common stock	795,227		34,375
Preferred stock	7,750		—
Replacement awards	5,999		—
Total consideration paid	$	808,980	$	49,575

Goodwill	$	49,510	$	15,897

___________________________________________

1.Other intangible assets are being amortized over a period of ten years.

Valuations of Loans

Estimated fair values for the loan portfolio acquired in the CrossFirst acquisition included adjustments to certain receivables that were not considered PCD as of the acquisition date. These fair value adjustments were determined using a discounted cash flow model that applied various assumptions about coupon rates, remaining maturities, prepayment speeds, projected default probabilities, losses given defaults, and estimates of prevailing discount rates. These loans did not show signs of deterioration since origination, and therefore, at the acquisition date, were not subject to the guidance related to PCD loans. Receivables acquired in the CrossFirst acquisition that were not subject to these requirements included non-PCD loans with a fair value of $4.70 billion and gross contractual amounts receivable of $4.79 billion.

A portion of acquired loans were PCD. The following table provides a reconciliation between the purchase price and the fair value of these financial assets:


	March 1, 2025		April 1, 2024
(dollars in thousands)	CrossFirst		M&M
PCD Financial Assets
Gross contractual receivable for PCD financial assets	$	1,539,718	$	29,290
ACL recorded for estimated uncollectible contractual cash flows specific to PCD financial assets	(100,783)		(1,243)
Interest premium (discount) specific to PCD financial assets	(3,063)		(1,773)
Loans previously charged-off prior to acquisition	(110,740)		—
Fair value of PCD financial assets	$	1,325,132	$	26,274

Pro Forma Results

The following unaudited pro forma information has been prepared as if the CrossFirst acquisition had occurred on January 1, 2024, and as if the M&M acquisition had occurred January 1, 2023. The pro forma results combine the historical results of CrossFirst and M&M into Busey’s Consolidated Statements of Income, including the impact of purchase accounting adjustments such as loan discount accretion, intangible assets amortization, and deposit accretion, net of taxes. The pro forma results have been prepared for comparative purposes only and are not necessarily indicative of the results that would have been obtained had the acquisitions actually occurred on January 1, 2024, or on January 1, 2023, as applicable. Further, pro forma information does not purport to be indicative of future financial operating results. No assumptions have been applied to the pro forma results of operations regarding possible revenue enhancements, expense efficiencies, or asset dispositions. Only the merger related expenses that have been recognized are included in net income in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024
Revenue (net interest income plus noninterest income)	$	758,049	$	750,667
Net income	182,837		170,894
Diluted earnings per common share	1.91		1.87

Other Acquisition Costs

Busey incurred acquisition related expenses as follows:


	Years Ended December 31,
(dollars in thousands)	2025		2024
Pre-tax acquisition expenses
M&M	$	108	$	3,038
CrossFirst1	100,200		3,863
Pre-tax acquisition expenses	$	100,308	$	6,901

___________________________________________

1.In addition to the acquisition costs presented in the table above, during the year ended December 31, 2025, Busey recorded a $4.0 million adjustment to the initial provision for unfunded commitments for CrossFirst acquisition-date balances based on revised estimates resulting from implementation of a new CECL model.

Acquisition related expenses for CrossFirst were comprised primarily of an initial provision to establish an ACL on non-PCD loans (recorded as provision expense), and multiple components of noninterest expense including an initial provision for unfunded commitments; salaries, wages and employee benefits (including equity compensation); data processing; and legal, professional, and consulting costs. Acquisition related expenses for M&M were comprised primarily of professional fees and data processing costs.

Of the total acquisition related expenses, the following legal, professional, and consulting costs were incurred to consummate the mergers:


	Years Ended December 31,
(dollars in thousands)	2025		2024
Pre-tax costs to consummate the merger
M&M	$	—	$	147
CrossFirst	7,533		3,125
Pre-tax costs to consummate the merger	$	7,533	$	3,272

For additional information about Busey’s accounting policies related to business combinations, see “Business Combinations” in “Note 1. Significa nt Accounting Policies.”

- Definition

The entire disclosure for business combination.

+ References

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+ Details

Insider Trading Policies and Procedures	12 Months Ended
Insider Trading Policies and Procedures	Mar. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,383,269	$ 1,271,981	$ 1,145,977
Ending balance	2,468,982	1,383,269	1,271,981
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(207,039)	(218,803)	(273,278)
Ending balance	(124,473)	(207,039)	(218,803)
Unrealized Gains (Losses) on Debt Securities Available For Sale and Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Unrealized holding gains (losses), net	61,782	(4,281)	39,989
Amounts reclassified from AOCI, net and Amortization of unrecognized losses on securities transferred to held to maturity	17,394	12,126	10,060
Unrealized Gains (Losses) on Debt Securities Available For Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(165,680)	(176,636)	(222,394)
Unrealized holding gains (losses), net	55,863	6,509	41,824
Amounts reclassified from AOCI, net and Amortization of unrecognized losses on securities transferred to held to maturity	11,124	4,447	3,934
Ending balance	(98,693)	(165,680)	(176,636)
Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(19,805)	(16,694)	(20,985)
Unrealized holding gains (losses), net	5,919	(10,790)	(1,835)
Amounts reclassified from AOCI, net and Amortization of unrecognized losses on securities transferred to held to maturity	6,270	7,679	6,126
Ending balance	(7,616)	(19,805)	(16,694)
Unrecognized Gains (Losses) on Debt Securities Held to Maturity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(21,554)	(25,473)	(29,899)
Amounts reclassified from AOCI, net and Amortization of unrecognized losses on securities transferred to held to maturity	3,390	3,919	4,426
Ending balance	$ (18,164)	$ (21,554)	$ (25,473)

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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-Section S50
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+ Details

STOCK-BASED COMPENSATION - Schedule of Stock Appreciation Rights Valuation Assumptions (Details) - SSARs	12 Months Ended
	Dec. 31, 2025 $ / shares
Share-based Compensation
Expected volatility, minimum	29.10%
Expected volatility, maximum	36.70%
Expected dividends	4.17%
Risk-free rate, minimum	3.97%
Risk-free rate, maximum	4.03%
Weighted average grant date fair value per share (in dollars per share)	$ 8.94
Exercise timing, number of days after termination	90 days
Termination rate assumed thereafter (as a percent)	5.00%
Minimum
Share-based Compensation
Simulation term	4 years 2 months 12 days
Termination rate assumed (as a percent)	25.00%
Maximum
Share-based Compensation
Simulation term	5 years 8 months 8 days
Termination rate assumed (as a percent)	50.00%

OTHER REAL ESTATE OWNED AND OTHER REPOSSESSED ASSETS (Tables)

12 Months Ended

Dec. 31, 2025

Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]

Schedule of OREO and Other Repossessed Assets Balances

The following table summarizes the composition of Busey’s OREO and other repossessed asset balances:


	As of December 31,
(dollars in thousands)	2025		2024
OREO
Commercial	$	95	$	—
Residential	605		63
Total OREO	700		63
Other repossessed assets	3,926		—
OREO and other repossessed assets	$	4,626	$	63

Schedule of Activity Related to OREO and Other Repossessed Assets

The following table summarizes changes in the OREO and other repossessed assets balance:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
OREO and other repossessed assets at January 1	$	63	$	125	$	850
Additions, transfers from loans and assumed in acquisitions	26,641		26		189
Sales	(21,233)		(84)		(770)
Cash payments (collected) paid	(423)		(4)		(44)
Impairment	(422)		—		(100)
OREO and other repossessed assets at December 31	$	4,626	$	63	$	125

Schedule of Activity Related to Foreclosed Assets

The table below summarizes the effect of these activities, included in other noninterest income and other noninterest expense on Busey’s Consolidated Statements of Income:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Income from (expense for) OREO and other repossessed assets
Operating income (expense), net	$	38	$	(17)	$	(67)
Net gain (loss) on sales	302		585		46
Impairment expense	(422)		—		(100)

Income from (expense for) OREO and other repossessed assets	$	(82)	$	568	$	(121)

PORTFOLIO LOANS - Schedule of the Financial Effect of Loan Modifications (Details)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modified [Line Items]
Weighted Average Term Extension	10 months	10 months	1 year 4 months 24 days
Weighted Average Interest Rate Reduction			2.50%
Commercial loans \| C&I and other commercial
Financing Receivable, Modified [Line Items]
Weighted Average Term Extension	9 months	1 year 3 months 18 days	1 year 6 months
Weighted Average Interest Rate Reduction			0.00%
Commercial loans \| CRE
Financing Receivable, Modified [Line Items]
Weighted Average Term Extension	11 months	4 months	1 year 9 months 18 days
Weighted Average Interest Rate Reduction			2.50%
Commercial loans \| Real estate construction
Financing Receivable, Modified [Line Items]
Weighted Average Term Extension	10 months	6 months	1 year
Weighted Average Interest Rate Reduction			0.00%

PORTFOLIO LOANS - Narrative (Details) - USD ($)	12 Months Ended
PORTFOLIO LOANS - Narrative (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred loan origination costs	$ 7,000,000.0	$ 12,500,000
Net accretable purchase accounting adjustments	(86,600,000)	(8,800,000)
Bank overdrafts	7,100,000	3,800,000
Amount of interest collected and recognized on a cash basis	0	0	$ 400,000
Commitment to lend	13,500,000	0
Collateral dependent loans secured by real estate or business assets	47,800,000	19,300,000
90+ Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross interest income that would have been recorded if impaired loans had been current	3,000,000.0	900,000	1,100,000
Retail loans \| CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans purchased	117,300,000	$ 6,900,000	$ 0
Commercial loans \| Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Limit where loans are processed through an expedited underwriting process	2,000,000.0
Commercial loans \| Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Limit above which loans are annually reviewed	2,000,000.0
Commercial loans \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Limit above which loans are annually reviewed	$ 350,000

PORTFOLIO LOANS - Schedule of Activity on the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Activity in the allowance for loan losses
ACL beginning balance	$ 83,404	$ 91,740	$ 91,608
Day 1 PCD	100,783	1,243
Day 2 Provision for loan losses	52,743	7,495	2,860
Provision for loan losses	3,313	8,590	2,399
Charged-off	(59,642)	(19,566)	(4,418)
Recoveries	3,732	1,397	2,151
ACL ending balance	174,023	83,404	91,740
CrossFirst
Activity in the allowance for loan losses
Day 2 Provision for loan losses	42,433
Charge-offs	36,800
Commercial loans \| C&I and other commercial
Activity in the allowance for loan losses
ACL beginning balance	21,589	21,256	23,860
Day 1 PCD	75,569	824
Provision for loan losses	(16,574)	14,455	(727)
Charged-off	(44,559)	(15,453)	(2,429)
Recoveries	2,697	507	552
ACL ending balance	61,370	21,589	21,256
Commercial loans \| C&I and other commercial \| CrossFirst
Activity in the allowance for loan losses
Day 2 Provision for loan losses	22,648
Commercial loans \| CRE
Activity in the allowance for loan losses
ACL beginning balance	32,301	35,465	38,299
Day 1 PCD	21,588	322
Provision for loan losses	13,677	(318)	(2,455)
Charged-off	(12,607)	(3,314)	(953)
Recoveries	265	146	574
ACL ending balance	70,328	32,301	35,465
Commercial loans \| CRE \| CrossFirst
Activity in the allowance for loan losses
Day 2 Provision for loan losses	15,104
Commercial loans \| Real estate construction
Activity in the allowance for loan losses
ACL beginning balance	3,345	5,163	6,457
Day 1 PCD	2,112	0
Provision for loan losses	3,105	(1,885)	(1,465)
Charged-off	0	0	0
Recoveries	95	67	171
ACL ending balance	11,568	3,345	5,163
Commercial loans \| Real estate construction \| CrossFirst
Activity in the allowance for loan losses
Day 2 Provision for loan losses	2,911
Retail loans \| CRE
Activity in the allowance for loan losses
ACL beginning balance	23,711	26,298	18,193
Day 1 PCD	1,430	96
Provision for loan losses	3,159	(3,031)	7,922
Charged-off	(1,251)	(168)	(407)
Recoveries	501	516	590
ACL ending balance	29,178	23,711	26,298
Retail loans \| CRE \| CrossFirst
Activity in the allowance for loan losses
Day 2 Provision for loan losses	1,628
Retail loans \| Retail other
Activity in the allowance for loan losses
ACL beginning balance	2,458	3,558	4,799
Day 1 PCD	84	1
Provision for loan losses	(54)	(631)	(876)
Charged-off	(1,225)	(631)	(629)
Recoveries	174	161	264
ACL ending balance	1,579	$ 2,458	$ 3,558
Retail loans \| Retail other \| CrossFirst
Activity in the allowance for loan losses
Day 2 Provision for loan losses	$ 142

TAX CREDIT INVESTMENTS AND OTHER INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	$ 165,995	$ 132,006
Deferred Income Taxes and Other Assets [Abstract]
Income tax credits and other tax benefits	$ 17,676	$ 20,734
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration]	Amortization of intangible assets	Amortization of intangible assets
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Amortization of intangible assets	Amortization of intangible assets
Amortization of investments in tax-advantaged projects	$ 15,735	$ 18,494
Tax credit investments \| Other assets
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	119,634	104,635
Other investments in unconsolidated entities \| Other assets
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	46,361	27,371
Unfunded investment obligations \| Other liabilities
Schedule of Equity Method Investments [Line Items]
Unfunded investment obligations	$ 68,690	$ 61,210

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Interest Rate Swaps Recorded in Noninterest Expense (Details) - Interest Rate Swap - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Financial Instruments
Net change in fair value of interest rate swaps	$ 0	$ 0	$ 0
Noninterest expense
Derivative Financial Instruments
Receive-fixed, pay-floating	(2,604)	1,726	(11,525)
Receive-floating, pay-fixed	$ 2,604	$ (1,726)	$ 11,525

GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Carrying Amount of Goodwill by Operating Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Goodwill and other intangibles assets
Total goodwill	$ 383,280	$ 333,695
Banking
Goodwill and other intangibles assets
Total goodwill	360,180	310,595
Wealth Management
Goodwill and other intangibles assets
Total goodwill	14,108	14,108
FirsTech
Goodwill and other intangibles assets
Total goodwill	$ 8,992	$ 8,992

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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- Definition

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+ References

+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

STOCK-BASED COMPENSATION - 2020 Equity Plan Narrative (Details) - 2020 Equity Plan - shares		12 Months Ended
	Apr. 14, 2023	Dec. 31, 2025
Share-based Compensation
Increase in the number of shares authorized for issuance (in shares)	1,350,000
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (in shares)		437,670
Remaining shares available for issuance (in shares)		658,552

- Definition

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JUNIOR SUBORDINATED DEBT OWED TO UNCOLSOLIDATED TRUSTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Junior subordinated debt owed to unconsolidated trusts
Junior subordinated debt owed to unconsolidated trusts	$ 77,328	$ 74,815
Fair value adjustment, remaining balance to be accreted	2,900	2,900
Trust Preferred Securities Subject to Mandatory Redemption
Junior subordinated debt owed to unconsolidated trusts
Maximum of holding companies assets retained	$ 15,000,000
Junior Subordinated Debt \| Trust Preferred Securities Subject to Mandatory Redemption
Junior subordinated debt owed to unconsolidated trusts
Maximum period to defer payment of interest on the notes and, therefore, distributions on the trust preferred securities	5 years
Parent Company
Junior subordinated debt owed to unconsolidated trusts
Junior subordinated debt owed to unconsolidated trusts	$ 77,328	$ 74,815

- Definition

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+ Details

EARNINGS PER COMMON SHARE - Schedule of Average Shares Excluded From Computation of Diluted Earnings Per Common Share (Details) - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Anti-dilutive securities excluded from the calculation of common stock equivalents
Total anti-dilutive common stock equivalents (in shares)	191,028	153,741	168,381
Options
Anti-dilutive securities excluded from the calculation of common stock equivalents
Total anti-dilutive common stock equivalents (in shares)	11,330	9,588	21,981
RSU awards
Anti-dilutive securities excluded from the calculation of common stock equivalents
Total anti-dilutive common stock equivalents (in shares)	1,124	3,216	39,445
PSU awards
Anti-dilutive securities excluded from the calculation of common stock equivalents
Total anti-dilutive common stock equivalents (in shares)	178,574	140,937	106,955

BUSINESS COMBINATIONS - Narrative (Details) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended	10 Months Ended
	Mar. 01, 2025 USD ($) $ / shares shares	Apr. 01, 2024 USD ($) $ / shares shares	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) state
Business Combination, Contingent Consideration [Line Items]
Number of states in which entity operates \| state					10
Preferred stock redemption price per share (in dollars per share) \| $ / shares	$ 1,000
Fair value adjustments				$ (400)	$ 1,900
Goodwill				$ 333,695	$ 383,280
CrossFirst
Business Combination, Contingent Consideration [Line Items]
Goodwill	$ 49,510	$ 15,900
Fair value of financial assets acquired	4,700,000
Gross contractual amounts of acquired receivables	$ 4,790,000
M&M
Business Combination, Contingent Consideration [Line Items]
Shares received for each share owned (in shares) \| shares		5.7294
Goodwill		$ 15,897
Per share cash consideration entitled (in dollars per share) \| $ / shares		$ 117.74
Mixed consideration (in dollars per share) \| $ / shares		$ 34.55
Mixed consideration ratio (in shares) \| shares		4.0481
Business combination consideration, number of shares (in shares) \| shares		1,429,304
Cash		$ 12,200
Consideration transferred per share in cash, Share Election (in dollars per share) \| $ / shares		$ 5.3966
Consideration transferred per share in shares, Share Election (in shares) \| shares		5.4668
Cash consideration received (in dollars per share) \| $ / shares		$ 117.74
Fractional shares, payment rate (in dollars per share) \| $ / shares		$ 23.32
Additional consideration transferred		$ 3,000
Number of shares redeemed ( in shares) \| shares		300
Fair value adjustments			$ (100)
SSARs \| CrossFirst \| Common \| CrossFirst
Business Combination, Contingent Consideration [Line Items]
Shares received for each share owned (in shares) \| shares	0.6675

EARNINGS PER COMMON SHARE (Tables)

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Schedule of Computation of Earnings Per Common Share

Earnings per common share have been computed as follows:


	Years Ended December 31,
(dollars in thousands, except per share amounts)	2025		2024		2023
Net income available to common stockholders	$	125,386	$	113,691	$	122,565

Weighted average number of common shares outstanding, basic	84,007,614		56,610,032		55,432,322
Dilutive effect of common stock equivalents:
Options	47		753		—
Warrants	—		—		324
SSARs	188,571		—		—
RSU awards	822,771		662,341		647,217
PSU awards	85,022		243,166		151,190
DSU awards	18,335		19,956		18,154
ESPP	11,266		6,753		6,941
Weighted average number of common shares outstanding, diluted	85,133,626		57,543,001		56,256,148

Basic earnings per common share	$	1.49	$	2.01	$	2.21
Diluted earnings per common share	1.47		1.98		2.18

Schedule of Average Shares Excluded From Computation of Diluted Earnings Per Common Share

Shares that were excluded from the computation of diluted earnings per common share because their effect would have been anti-dilutive are summarized in the table below for the periods presented:


	Years Ended December 31,
	2025	2024	2023
Anti-dilutive common stock equivalents
Options	11,330	9,588	21,981

RSU awards	1,124	3,216	39,445
PSU awards	178,574	140,937	106,955

Total anti-dilutive common stock equivalents	191,028	153,741	168,381

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Interest Income (Expense) Recorded on Swap Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Financial Instruments
Net interest income	$ 569,609	$ 322,611	$ 320,621
Interest Rate Swap \| Cash Flow Hedging
Derivative Financial Instruments
Increase (decrease) in interest income on swap transactions	(8,432)	(10,669)	(10,326)
(Increase) decrease in interest expense on swap transactions	0	1,378	1,757
Net interest income	$ (8,432)	$ (9,291)	$ (8,569)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative effect of change in accounting principal (ASU 2023-02)	Preferred	Common	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative effect of change in accounting principal (ASU 2023-02)	AOCI	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2022			0	55,279,124
Beginning balance at Dec. 31, 2022	$ 1,145,977		$ 0	$ 58	$ 1,320,980	$ 168,769		$ (273,278)	$ (70,552)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	122,565					122,565
OCI, net of tax	54,475							54,475
Repurchase of stock (in shares)				(227,935)
Repurchase of stock	(4,482)								(4,482)
Issuance of treasury stock for ESPP (in shares)				59,845
Issuance of treasury stock for ESPP	1,011				(530)				1,541
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (in shares)				132,091
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax	(1,093)				(4,494)				3,401
Net issuance of treasury stock for SSARs and warrants exercised and related tax (in shares)				994
Net issuance of treasury stock for SSARs and warrants exercised and related tax	9				(17)				26
Cash dividends common stock	(53,076)					(53,076)
Stock dividend equivalents on RSUs/PSUs/DSUs	0				1,061	(1,061)
Stock-based compensation	6,595				6,595
Ending balance (in shares) at Dec. 31, 2023			0	55,244,119
Ending balance at Dec. 31, 2023	1,271,981	$ (1,391)	$ 0	$ 58	1,323,595	237,197	$ (1,391)	(218,803)	(70,066)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	113,691					113,691
OCI, net of tax	11,764							11,764
Stock issued in acquisition, net of stock issuance costs (in shares)				1,429,304
Stock issued in acquisition, net of stock issuance costs	34,234			$ 2	34,232
Issuance of treasury stock for ESPP (in shares)				58,843
Issuance of treasury stock for ESPP	1,190				(325)				1,515
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (in shares)				163,387
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax	(1,754)				(5,961)				4,207
Net issuance of treasury stock for warrants exercised (in shares)				328
Net issuance of treasury stock for warrants exercised	(3)				(11)				8
Cash dividends common stock	(54,169)					(54,169)
Stock dividend equivalents on RSUs/PSUs/DSUs	0				1,274	(1,274)
Stock-based compensation	7,726				7,726
Ending balance (in shares) at Dec. 31, 2024			0	56,895,981
Ending balance at Dec. 31, 2024	1,383,269		$ 0	$ 60	1,360,530	294,054		(207,039)	(64,336)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	135,262					135,262
OCI, net of tax	82,566							82,566
Stock issued in acquisition, net of stock issuance costs (in shares)			7,750	33,148,268
Stock issued in acquisition, net of stock issuance costs	808,055			$ 33	808,022
Issuance of preferred stock, net of issuance costs (in shares)			215,000
Issuance of preferred stock, net of issuance costs	207,447				207,447
Repurchase of stock (in shares)				(3,063,100)
Repurchase of stock	(69,859)								(69,859)
Issuance of treasury stock for ESPP (in shares)				97,590
Issuance of treasury stock for ESPP	1,845				(488)				2,333
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (in shares)				514,785
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax	(5,282)				(17,566)				12,284
Net issuance of treasury stock for SSARs and warrants exercised and related tax (in shares)				30,906
Net issuance of treasury stock for SSARs and warrants exercised and related tax	(452)				(1,174)				722
Cash dividends on preferred stock	(9,876)					(9,876)
Cash dividends common stock	(81,113)					(81,113)
Stock dividend equivalents on RSUs/PSUs/DSUs	0				1,620	(1,620)
Stock-based compensation	17,120				17,120
Ending balance (in shares) at Dec. 31, 2025			222,750	87,624,430
Ending balance at Dec. 31, 2025	$ 2,468,982		$ 0	$ 93	$ 2,375,511	$ 336,707		$ (124,473)	$ (118,856)

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Net Gains (Losses) Recorded in AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Financial Instruments
Net gain (loss) recognized in OCI, net of tax	$ 7,780	$ (13,055)	$ (2,567)
Cash Flow Hedging \| Interest Rate Contract
Derivative Financial Instruments
Net gain (loss) recognized in OCI, net of tax	5,919	(10,790)	(1,835)
(Gain) loss reclassified from OCI to interest income, net of tax	6,270	8,818	7,382
(Gain) loss reclassified from OCI to interest expense, net of tax	0	(1,139)	(1,256)
Net change in unrealized gains (losses) on cash flow hedges, net of tax	$ 12,189	$ (3,111)	$ 4,291

STOCK-BASED COMPENSATION - Schedule of Stock Appreciation Rights Activity (Details) - SSARs - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Shares
Outstanding at beginning of period (in shares)	0
Replacement of CrossFirst SSARs (in shares)	424,390
Exercised (in shares)	(119,842)
Forfeited (in shares)	(4,005)
Expired (in shares)	(30,145)
Outstanding at end of period (in shares)	270,398
Exercisable (in shares)	253,560
Weighted- Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 0
Replacement of CrossFirst SSARs (in dollars per share)	15.78
Exercised (in dollars per shares)	13.31
Forfeited (in dollars per shares)	16.00
Expired (in dollars per shares)	23.23
Outstanding at ending of period (in dollars per share)	16.04
Exercisable (in dollars per share)	$ 15.70
Weighted- Average Remaining Contractual Term
Weighted- Average Remaining Contractual Term	4 years 11 months 23 days
Weighted- Average Remaining Contractual Term, Exercisable (in years)	4 years 11 months 8 days
Intrinsic value, options outstanding	$ 2,095	$ 0
Intrinsic value, exercisable at end of year	2,051
Aggregate intrinsic value of SSARs exercised	$ 1,100

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

12 Months Ended

Dec. 31, 2025

Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Alternative [Abstract]

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

NOTE 22. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table summarizes changes AOCI by component, net of tax:


(dollars in thousands)	Unrealized Gains (Losses) on Debt Securities Available For Sale		Unrecognized Gains (Losses) on Debt Securities Held to Maturity		Unrealized Gains (Losses) on Cash Flow Hedges		Total
Balance, December 31, 2022	$	(222,394)	$	(29,899)	$	(20,985)	$	(273,278)
Unrealized holding gains (losses), net	41,824		—		(1,835)		39,989

Amounts reclassified from AOCI, net	3,934		—		6,126		10,060
Amortization of unrecognized losses on securities transferred to held to maturity	—		4,426		—		4,426
Balance, December 31, 2023	(176,636)		(25,473)		(16,694)		(218,803)
Unrealized holding gains (losses), net	6,509		—		(10,790)		(4,281)

Amounts reclassified from AOCI, net	4,447		—		7,679		12,126
Amortization of unrecognized losses on securities transferred to held to maturity	—		3,919		—		3,919
Balance, December 31, 2024	(165,680)		(21,554)		(19,805)		(207,039)
Unrealized holding gains (losses), net	55,863		—		5,919		61,782

Amounts reclassified from AOCI, net	11,124		—		6,270		17,394
Amortization of unrecognized losses on securities transferred to held to maturity	—		3,390		—		3,390
Balance, December 31, 2025	$	(98,693)	$	(18,164)	$	(7,616)	$	(124,473)

REGULATORY CAPITAL - Schedule of Regulatory Capital Requirements Applicable to Busey and Busey Bank (Details) $ in Thousands	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount
Actual	$ 1,920,388	$ 1,237,301
Minimum Capital Requirement	694,987	394,840
Minimum To Be Well Capitalized	$ 1,003,870	$ 570,325
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio
Actual	0.1243	0.1410
Minimum Capital Requirement	0.0450	0.0450
Minimum To Be Well Capitalized	0.0650	0.0650
Tier 1 Capital to Risk Weighted Assets, Amount
Actual	$ 2,143,138	$ 1,314,301
Minimum Capital Requirement	926,650	526,453
Minimum To Be Well Capitalized	$ 1,235,533	$ 701,938
Tier 1 Capital to Risk Weighted Assets, Ratio
Actual	0.1388	0.1498
Minimum Capital Requirement	0.0600	0.0600
Minimum To Be Well Capitalized	0.0800	0.0800
Total Capital to Risk Weighted Assets, Amount
Actual	$ 2,459,847	$ 1,625,943
Minimum Capital Requirement	1,235,533	701,938
Minimum To Be Well Capitalized	$ 1,544,416	$ 877,422
Total Capital to Risk Weighted Assets, Ratio
Actual	0.1593	0.1853
Minimum Capital Requirement	0.0800	0.0800
Minimum To Be Well Capitalized	0.1000	0.1000
Leverage Ratio of Tier 1 Capital to Average Assets, Amount
Actual	$ 2,143,138	$ 1,314,301
Minimum Capital Requirement	$ 718,334	$ 475,348
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio
Actual	0.1193	0.1106
Minimum Capital Requirement	0.0400	0.0400
Busey Bank
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount
Actual	$ 2,150,048	$ 1,438,296
Minimum Capital Requirement	692,654	393,277
Minimum To Be Well Capitalized	$ 1,000,500	$ 568,067
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio
Actual	0.1397	0.1646
Minimum Capital Requirement	0.0450	0.0450
Minimum To Be Well Capitalized	0.0650	0.0650
Tier 1 Capital to Risk Weighted Assets, Amount
Actual	$ 2,150,048	$ 1,438,296
Minimum Capital Requirement	923,539	524,369
Minimum To Be Well Capitalized	$ 1,231,385	$ 699,159
Tier 1 Capital to Risk Weighted Assets, Ratio
Actual	0.1397	0.1646
Minimum Capital Requirement	0.0600	0.0600
Minimum To Be Well Capitalized	0.0800	0.0800
Total Capital to Risk Weighted Assets, Amount
Actual	$ 2,287,179	$ 1,520,938
Minimum Capital Requirement	1,231,385	699,159
Minimum To Be Well Capitalized	$ 1,539,231	$ 873,949
Total Capital to Risk Weighted Assets, Ratio
Actual	0.1486	0.1740
Minimum Capital Requirement	0.0800	0.0800
Minimum To Be Well Capitalized	0.1000	0.1000
Leverage Ratio of Tier 1 Capital to Average Assets, Amount
Actual	$ 2,150,048	$ 1,438,296
Minimum Capital Requirement	716,476	473,878
Minimum To Be Well Capitalized	$ 895,596	$ 592,347
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio
Actual	0.1200	0.1214
Minimum Capital Requirement	0.0400	0.0400
Minimum To Be Well Capitalized	0.0500	0.0500

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Cybersecurity Risk Management and Strategy Disclosure	Dec. 31, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Busey maintains a cyber security risk management program designed to prevent, detect, and respond to information security threats. The program is designed to align with the Cyber Risk Institute’s Profile framework, which is based on the National Institute of Standards and Technology’s Cybersecurity Framework. The program is led by Busey’s Chief Information Security Officer (“CISO”). Busey’s CISO has been in the role since September 2020 and has over 15 years of experience across external and internal audit, technology risk management, and cybersecurity matters, primarily within the financial services sector, and also including additional industries such as healthcare, technology, consumer products, and manufacturing for both regional and multinational corporations. Busey’s cyber security risk management program is a key part of the Company’s overall risk management system, which is administered by the Chief Risk Officer. Busey’s cyber security risk management program includes administrative, technical, and physical safeguards to help ensure the security and confidentiality of customer records and information. Busey has long devoted significant resources to assessing, identifying, and managing risks associated with cybersecurity threats, including: •Establishing an internal cybersecurity team that is responsible for conducting regular assessments of Busey’s information systems, existing controls, vulnerabilities, and potential improvements; •Employing continuous monitoring tools that can detect and help respond to cybersecurity threats in real-time; •Performing due diligence with respect to third-party service providers, including their cybersecurity practices, and requiring contractual commitments from Busey’s service providers to take certain cybersecurity measures; •Ongoing monitoring and assessment of third-party vendors' cybersecurity practices, including regular audits, compliance checks, and incident reporting requirements; •Engaging third-party cybersecurity consultants, who conduct periodic penetration testing, vulnerability assessments, and other procedures to identify potential weaknesses in Busey’s systems and processes; •Mandating periodic cybersecurity training for Busey’s workforce, which includes awareness programs on phishing, social engineering, and other common cyber threats; •Implementing access control measures such as multi-factor authentication, role-based access controls, and regular access reviews to ensure that only authorized personnel have access to critical systems and data; •Using data encryption for both data at rest and data in transit to protect sensitive information; and •Creating an incident response plan that outlines the steps to contain, mitigate, and remediate the impact of cybersecurity incidents, including communication protocols and post-incident analysis. Busey’s security and privacy policies and procedures are in effect across all of its businesses and geographic locations. Busey adheres to various regulatory requirements and standards, including the Gramm-Leach-Bliley Act to ensure compliance with data protection laws. Additionally, Busey maintains cybersecurity insurance coverage to mitigate potential financial impacts from cyber incidents.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Busey’s security and privacy policies and procedures are in effect across all of its businesses and geographic locations. Busey adheres to various regulatory requirements and standards, including the Gramm-Leach-Bliley Act to ensure compliance with data protection laws. Additionally, Busey maintains cybersecurity insurance coverage to mitigate potential financial impacts from cyber incidents.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Busey’s board of directors, as a whole and through its Enterprise Risk Committee (the “Risk Committee”), is responsible for the oversight of risk management. In that role, Busey’s board of directors and its Risk Committee, with support from Busey’s cybersecurity advisors, are responsible for ensuring that the risk management processes developed and implemented by management are adequate and functioning as designed. To carry out those duties, both the board of directors and the Risk Committee receive quarterly reports from Busey’s management team regarding cybersecurity risks, and Busey’s efforts to prevent, detect, mitigate, and remediate any cybersecurity incidents.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	Busey’s board of directors, as a whole and through its Enterprise Risk Committee (the “Risk Committee”), is responsible for the oversight of risk management.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	To carry out those duties, both the board of directors and the Risk Committee receive quarterly reports from Busey’s management team regarding cybersecurity risks, and Busey’s efforts to prevent, detect, mitigate, and remediate any cybersecurity incidents.
Cybersecurity Risk Role of Management [Text Block]	Busey’s board of directors, as a whole and through its Enterprise Risk Committee (the “Risk Committee”), is responsible for the oversight of risk management. In that role, Busey’s board of directors and its Risk Committee, with support from Busey’s cybersecurity advisors, are responsible for ensuring that the risk management processes developed and implemented by management are adequate and functioning as designed. To carry out those duties, both the board of directors and the Risk Committee receive quarterly reports from Busey’s management team regarding cybersecurity risks, and Busey’s efforts to prevent, detect, mitigate, and remediate any cybersecurity incidents.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The program is led by Busey’s Chief Information Security Officer (“CISO”).
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Busey’s CISO has been in the role since September 2020 and has over 15 years of experience across external and internal audit, technology risk management, and cybersecurity matters, primarily within the financial services sector, and also including additional industries such as healthcare, technology, consumer products, and manufacturing for both regional and multinational corporations.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	Busey’s board of directors, as a whole and through its Enterprise Risk Committee (the “Risk Committee”), is responsible for the oversight of risk management. In that role, Busey’s board of directors and its Risk Committee, with support from Busey’s cybersecurity advisors, are responsible for ensuring that the risk management processes developed and implemented by management are adequate and functioning as designed. To carry out those duties, both the board of directors and the Risk Committee receive quarterly reports from Busey’s management team regarding cybersecurity risks, and Busey’s efforts to prevent, detect, mitigate, and remediate any cybersecurity incidents.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

PORTFOLIO LOANS - Schedule of Past Due and Non-accrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Total portfolio loans	$ 13,567,799	$ 7,697,087
90 days past due and still accruing	2,288	1,149
Non-accrual Loans	51,198	22,088
Non-accrual Loans with No Allowance for Credit Losses	6,707	16,418
30-59 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	9,009	4,552
60-89 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	7,466	3,572
Commercial loans
Financing Receivable, Past Due [Line Items]
Total portfolio loans	10,818,515	5,552,288
90 days past due and still accruing	2,128	0
Non-accrual Loans	42,403	18,928
Non-accrual Loans with No Allowance for Credit Losses	6,358	16,224
Commercial loans \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	4,061	178
Commercial loans \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	3,107	2,759
Commercial loans \| C&I and other commercial
Financing Receivable, Past Due [Line Items]
Total portfolio loans	4,229,208	1,904,515
90 days past due and still accruing	2,128	0
Non-accrual Loans	34,298	3,852
Non-accrual Loans with No Allowance for Credit Losses	4,612	1,224
Commercial loans \| C&I and other commercial \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	3,577	95
Commercial loans \| C&I and other commercial \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	593	0
Commercial loans \| CRE
Financing Receivable, Past Due [Line Items]
Total portfolio loans	5,550,018	3,269,564
90 days past due and still accruing	0	0
Non-accrual Loans	7,832	15,053
Non-accrual Loans with No Allowance for Credit Losses	1,588	15,000
Commercial loans \| CRE \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	484	42
Commercial loans \| CRE \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	2,514	2,759
Commercial loans \| Real estate construction
Financing Receivable, Past Due [Line Items]
Total portfolio loans	1,039,289	378,209
90 days past due and still accruing	0	0
Non-accrual Loans	273	23
Non-accrual Loans with No Allowance for Credit Losses	158	0
Commercial loans \| Real estate construction \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	0	41
Commercial loans \| Real estate construction \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	0	0
Retail loans
Financing Receivable, Past Due [Line Items]
Total portfolio loans	2,749,284	2,144,799
90 days past due and still accruing	160	1,149
Non-accrual Loans	8,795	3,160
Non-accrual Loans with No Allowance for Credit Losses	349	194
Retail loans \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	4,948	4,374
Retail loans \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	4,359	813
Retail loans \| CRE
Financing Receivable, Past Due [Line Items]
Total portfolio loans	2,154,616	1,696,457
90 days past due and still accruing	136	1,115
Non-accrual Loans	8,421	2,984
Non-accrual Loans with No Allowance for Credit Losses	349	194
Retail loans \| CRE \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	2,457	3,280
Retail loans \| CRE \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	4,280	683
Retail loans \| Retail other
Financing Receivable, Past Due [Line Items]
Total portfolio loans	594,668	448,342
90 days past due and still accruing	24	34
Non-accrual Loans	374	176
Non-accrual Loans with No Allowance for Credit Losses	0	0
Retail loans \| Retail other \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	2,491	1,094
Retail loans \| Retail other \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total portfolio loans	$ 79	$ 130

BUSINESS COMBINATIONS- Schedule of Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Revenue (net interest income plus noninterest income)	$ 758,049	$ 750,667
Net income	$ 182,837	$ 170,894
Diluted earnings per common share (in dollars per share)	$ 1.91	$ 1.87

INCOME TAXES - Schedule of Income Tax Payments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items]
Federal	$ 16,794	$ 11,200	$ 18,300
Illinois/Other	4,100
Total income tax payments	20,909	12,907	25,408
Illinois
Effective Income Tax Rate Reconciliation [Line Items]
Illinois/Other			5,240
Other
Effective Income Tax Rate Reconciliation [Line Items]
Illinois/Other	$ 4,115	$ 1,707	$ 1,868

BORROWINGS - Revolving Line of Credit (Details) - Revolving Credit Facility - USD ($)	May 28, 2021	Dec. 31, 2025
Short-Term Debt [Line Items]
Issuance of debt	$ 40,000,000.0
Floating interest rate margin	1.80%
Balance outstanding		$ 0

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Interest income
Interest and fees on loans	$ 776,433	$ 426,422	$ 385,848
Taxable interest income	84,212	72,794	80,316
Non-taxable interest income	5,626	1,176	2,678
Dividend income on bank stock	2,956	848	1,170
Other interest income	24,633	22,441	10,531
Total interest income	893,860	523,681	480,543
Interest expense
Deposits	302,989	178,463	123,985
Federal funds purchased and securities sold under agreements to repurchase	3,708	4,308	5,203
Short-term borrowings	621	701	12,775
Long-term borrowings	2,841	300	1,700
Subordinated notes	8,602	12,650	12,406
Junior subordinated debt owed to unconsolidated trusts	5,490	4,648	3,853
Total interest expense	324,251	201,070	159,922
Net interest income	569,609	322,611	320,621
Provision for credit losses	52,743	7,495	2,860
Net interest income after provision for credit losses	516,866	315,116	317,761
Noninterest income
Mortgage revenue	2,565	2,075	1,089
Income on bank owned life insurance	6,597	5,130	4,701
Realized net gains (losses) on the sale of mortgage servicing rights	0	7,724	0
Realized net gains (losses) on securities	(15,242)	(7,033)	(28)
Unrealized net gains (losses) recognized on equity securities	4,516	931	(2,171)
Other noninterest income	20,462	14,001	9,248
Total noninterest income	149,975	139,682	121,214
Noninterest expense
Salaries, wages, and employee benefits	289,063	175,619	162,597
Data processing	43,181	27,124	23,708
Net occupancy expense of premises	29,490	18,737	18,214
Furniture and equipment expenses	8,496	6,805	6,759
Professional fees	18,807	12,804	7,147
Amortization of intangible assets	16,614	10,057	10,432
Interchange expense	5,194	6,001	6,864
FDIC insurance	10,397	5,603	5,650
Other noninterest expense	58,959	38,744	43,700
Total noninterest expense	480,201	301,494	285,071
Income before income taxes	186,640	153,304	153,904
Income taxes	51,378	39,613	31,339
Net income	135,262	113,691	122,565
Dividends on preferred stock	9,876	0	0
Net income available to common stockholders	$ 125,386	$ 113,691	$ 122,565
Weighted average number of common shares outstanding, basic (in shares)	84,007,614	56,610,032	55,432,322
Weighted average number of common shares outstanding, diluted (in shares)	85,133,626	57,543,001	56,256,148
Basic earnings per common share (in dollars per share)	$ 1.49	$ 2.01	$ 2.21
Diluted earnings per common share (in dollars per share)	$ 1.47	$ 1.98	$ 2.18
Wealth management fees
Noninterest income
Noninterest income	$ 69,426	$ 63,630	$ 57,309
Payment technology solutions
Noninterest income
Noninterest income	20,000	21,983	21,192
Treasury management services
Noninterest income
Noninterest income	17,322	8,377	7,435
Card services and ATM fees
Noninterest income
Noninterest income	18,048	13,424	12,305
Other service charges on deposit accounts
Noninterest income
Noninterest income	$ 6,281	$ 9,440	$ 10,134

EARNINGS PER COMMON SHARE

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

EARNINGS PER COMMON SHARE

NOTE 21. EARNINGS PER COMMON SHARE

Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding, which include DSUs that are vested but not delivered. Net income available to common stockholders is net income less dividends that have been declared on Busey’s preferred stock (all of which is non-cumulative). Diluted earnings per common share is computed using the treasury stock method and reflects the potential dilution that could occur if Busey’s outstanding stock options and SSARs were exercised, stock units were vested, and ESPP shares were issued.

Earnings per common share have been computed as follows:


	Years Ended December 31,
(dollars in thousands, except per share amounts)	2025		2024		2023
Net income available to common stockholders	$	125,386	$	113,691	$	122,565

Weighted average number of common shares outstanding, basic	84,007,614		56,610,032		55,432,322
Dilutive effect of common stock equivalents:
Options	47		753		—
Warrants	—		—		324
SSARs	188,571		—		—
RSU awards	822,771		662,341		647,217
PSU awards	85,022		243,166		151,190
DSU awards	18,335		19,956		18,154
ESPP	11,266		6,753		6,941
Weighted average number of common shares outstanding, diluted	85,133,626		57,543,001		56,256,148

Basic earnings per common share	$	1.49	$	2.01	$	2.21
Diluted earnings per common share	1.47		1.98		2.18

Shares that were excluded from the computation of diluted earnings per common share because their effect would have been anti-dilutive are summarized in the table below for the periods presented:


	Years Ended December 31,
	2025	2024	2023
Anti-dilutive common stock equivalents
Options	11,330	9,588	21,981

RSU awards	1,124	3,216	39,445
PSU awards	178,574	140,937	106,955

Total anti-dilutive common stock equivalents	191,028	153,741	168,381

BUSINESS COMBINATIONS - Schedule of Pre-tax Costs to Consummate the Merger (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Business Combination [Line Items]
Pre-tax costs to consummate the merger	$ 7,533	$ 3,272
M&M
Business Combination [Line Items]
Pre-tax costs to consummate the merger	0	147
CrossFirst
Business Combination [Line Items]
Pre-tax costs to consummate the merger	$ 7,533	$ 3,125

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 805
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-Paragraph 2
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Reference 41: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
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-Section 50
-Paragraph 2
-Subparagraph (g)(1)
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Reference 42: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
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-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

+ Details

GOODWILL AND OTHER INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

NOTE 8. GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill

Busey’s goodwill is associated with its three operating segments, Banking, Wealth Management, and FirsTech. Goodwill is tested annually for impairment, and as part of this analysis, the reporting unit's carrying value is compared to its estimated fair value. Based on the impairment testing performed at December 31, 2025, there were no indicators of potential impairment.

In connection with the acquisition of CrossFirst, Busey recorded goodwill totaling $49.5 million and other intangible assets of $81.8 million during the year ended December 31, 2025, each in the Banking segment. In connection with the acquisition of M&M, Busey recorded goodwill totaling $0.1 million during the year ended December 31, 2025, and recorded goodwill totaling $15.8 million and other intangible assets of $6.3 million during the year ended December 31, 2024, each in the banking segment.

The carrying amount of goodwill by operating segment is presented in the table below:


	As of December 31,
(dollars in thousands)	2025		2024
Goodwill
Banking	$	360,180	$	310,595
Wealth Management	14,108		14,108
FirsTech	8,992		8,992
Total goodwill	$	383,280	$	333,695

Indefinite-lived intangible assets, such as goodwill, are not amortized. Goodwill is Busey's only indefinite-lived intangible asset.

Intangible Assets

Core deposit and customer relationship intangible assets are amortized over the estimated period during which Busey expects to benefit from the assets. The following table present Busey’s intangible asset balances and the related amounts of accumulated amortization:


	As of December 31, 2025
(dollars in thousands)	Core deposit intangible		Customer relationship intangible		Total
Intangible Assets
Intangible assets, gross	$	187,194	$	33,138	$	220,332
Accumulated amortization	93,558		29,325		122,883
Intangible assets, net	$	93,636	$	3,813	$	97,449


	As of December 31, 2024
(dollars in thousands)	Core deposit intangible		Customer relationship intangible		Total
Intangible Assets
Intangible assets, gross	$	105,411	$	33,138	$	138,549
Accumulated amortization	78,831		27,438		106,269
Intangible assets, net	$	26,580	$	5,700	$	32,280

Amortization expense related to intangible assets, as reflected on Busey's Consolidated Statements of Income, is presented in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Amortization Expense
Core deposit intangible	$	14,727	$	7,739	$	7,616
Customer relationship intangible	1,887		2,318		2,816
Amortization of intangible assets	$	16,614	$	10,057	$	10,432

Future expense for the amortization of intangible assets, as estimated, is summarized in the table below:


	As of December 31, 2025
(dollars in thousands)	Core deposit intangible		Customer relationship intangible		Total
Estimated amortization expense
2026	$	15,277	$	1,479	$	16,756
2027	14,251		1,091		15,342
2028	13,184		703		13,887
2029	10,266		360		10,626
2030	9,160		162		9,322
Thereafter	31,498		18		31,516
Total estimated amortization expense	$	93,636	$	3,813	$	97,449

For additional information about Busey’s accounting policies related to goodwill and other intangible assets, see “Goodwill and Other Intangible Assets” in “Note 1. Significant Accounting Policies.”

PREMISES AND EQUIPMENT - Schedule of Depreciation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 12,926	$ 9,503	$ 9,488

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References + Details

SIGNIFICANT ACCOUNTING POLICIES - Cash Surrender Value of Bank Owned Life Insurance (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Bank owned life insurance accrued liability	$ 5.5	$ 5.7

INCOME TAXES - Schedule of the Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
ACL	$ 70,282,000	$ 23,685,000
Unrealized loss on cash flow hedge	2,744,000	7,256,000
Unrealized losses on securities available for sale, net	43,634,000	61,479,000
Unrealized losses on securities held to maturity	6,335,000	8,068,000
Stock-based compensation	8,089,000	6,431,000
Purchase accounting adjustments	3,695,000	2,076,000
Accrued vacation	713,000	493,000
Lease liabilities	8,016,000	2,951,000
Employee costs	12,359,000	5,725,000
Tax credits	2,873,000	0
State net operating loss carryovers	712,000	0
Other	1,931,000	0
Deferred tax assets before valuation allowances	161,383,000	118,164,000
Valuation allowances	(712,000)	0
Total deferred tax assets	160,671,000	118,164,000
Deferred tax liabilities:
Basis in premises and equipment	(6,716,000)	(2,419,000)
Affordable housing partnerships and other investments	(8,920,000)	(8,011,000)
Purchase accounting adjustments	(927,000)	(1,022,000)
Mortgage servicing assets	(872,000)	(745,000)
Basis in core deposit, customer intangible assets, and asset purchase goodwill	(20,427,000)	(3,325,000)
Deferred loan origination costs	(1,836,000)	(3,317,000)
Right of use assets	(7,427,000)	(2,835,000)
Unrealized gain on equity securities	(1,268,000)	(172,000)
Other	(900,000)	(856,000)
Total deferred tax liabilities	(49,293,000)	(22,702,000)
Net deferred tax asset	$ 111,378,000	$ 95,462,000

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of the Interest-Rate Swaps Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Interest Rate Swap
Balances carried in AOCI
Unrealized gains (losses) on cash flow hedges, net of tax	$ 0	$ 0	$ 0
Cash Flow Hedging \| Interest Rate Swap
Derivative Financial Instruments
Notional amount	500,000	500,000
Balances carried in AOCI
Unrealized gains (losses) on cash flow hedges, net of tax	(7,616)	(19,805)
Cash Flow Hedging \| Interest Rate Swap \| Other assets
Gross aggregate fair value of the swaps
Gross aggregate fair value of swap assets	3,215	0
Cash Flow Hedging \| Interest Rate Swap \| Other liabilities
Gross aggregate fair value of the swaps
Gross aggregate fair value of swap liabilities	14,589	27,770
Cash Flow Hedging \| Prime Loan Swap
Derivative Financial Instruments
Notional amount	$ 300,000	$ 300,000
Weighted average rate: receive-fixed	4.81%	4.81%
Weighted average variable Prime pay rates and 1-month CME Term SOFR pay rates	6.81%	7.62%
Weighted average maturity	3 years 1 month 6 days	4 years 1 month 6 days
Cash Flow Hedging \| SOFR Loan Swaps
Derivative Financial Instruments
Notional amount	$ 200,000	$ 200,000
Weighted average rate: receive-fixed	3.78%	3.78%
Weighted average variable Prime pay rates and 1-month CME Term SOFR pay rates	3.82%	0.00%
Weighted average maturity	3 years 9 months 3 days	4 years 9 months 3 days

REGULATORY CAPITAL (Tables)

12 Months Ended

Dec. 31, 2025

Banking and Thrift, Other Disclosure [Abstract]

Schedule of Regulatory Capital Requirements Applicable to Busey and Busey Bank

The following tables summarize regulatory capital requirements applicable to First Busey and Busey Bank:


	As of December 31, 2025
	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized
(dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common equity Tier 1 capital to risk weighted assets
First Busey	$	1,920,388	12.43	%	$	694,987	4.50	%	$	1,003,870	6.50	%
Busey Bank	$	2,150,048	13.97	%	$	692,654	4.50	%	$	1,000,500	6.50	%

Tier 1 capital to risk weighted assets
First Busey	$	2,143,138	13.88	%	$	926,650	6.00	%	$	1,235,533	8.00	%
Busey Bank	$	2,150,048	13.97	%	$	923,539	6.00	%	$	1,231,385	8.00	%

Total capital to risk weighted assets
First Busey	$	2,459,847	15.93	%	$	1,235,533	8.00	%	$	1,544,416	10.00	%
Busey Bank	$	2,287,179	14.86	%	$	1,231,385	8.00	%	$	1,539,231	10.00	%

Leverage ratio of Tier 1 capital to average assets
First Busey	$	2,143,138	11.93	%	$	718,334	4.00	%	N/A		N/A
Busey Bank	$	2,150,048	12.00	%	$	716,476	4.00	%	$	895,596	5.00	%


	As of December 31, 2024
	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized
(dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common equity Tier 1 capital to risk weighted assets
First Busey	$	1,237,301	14.10	%	$	394,840	4.50	%	$	570,325	6.50	%
Busey Bank	$	1,438,296	16.46	%	$	393,277	4.50	%	$	568,067	6.50	%

Tier 1 capital to risk weighted assets
First Busey	$	1,314,301	14.98	%	$	526,453	6.00	%	$	701,938	8.00	%
Busey Bank	$	1,438,296	16.46	%	$	524,369	6.00	%	$	699,159	8.00	%

Total capital to risk weighted assets
First Busey	$	1,625,943	18.53	%	$	701,938	8.00	%	$	877,422	10.00	%
Busey Bank	$	1,520,938	17.40	%	$	699,159	8.00	%	$	873,949	10.00	%

Leverage ratio of Tier 1 capital to average assets
First Busey	$	1,314,301	11.06	%	$	475,348	4.00	%	N/A		N/A
Busey Bank	$	1,438,296	12.14	%	$	473,878	4.00	%	$	592,347	5.00	%

BORROWINGS (Tables)

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Schedule of Distribution of Securities Sold Under Agreements to Repurchase and Short-term Borrowings and Weighted Average Interest Rates

Securities sold under agreements to repurchase were as follows:


	As of December 31,
(dollars in thousands)	2025			2024
Securities sold under agreements to repurchase	$	166,929		$	155,610
Weighted average rate for securities sold under agreements to repurchase	2.22		%	2.63		%

Schedule of Long-Term Debt

Long-term borrowings are summarized in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Long-term borrowings
FHLB borrowings	$	102,792	$	—
Secured borrowings	4,791		—

Finance lease liabilities	6,223		—
Total long-term borrowings	$	113,806	$	—

Schedule of Unamortized Debt Issuance Cost

Unamortized debt issuance costs related to Busey’s subordinated notes are presented in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Unamortized debt issuance costs
Subordinated notes issued in 2020	$	—	$	222
Subordinated notes issued in 2022	605		1,004
Total unamortized debt issuance costs	$	605	$	1,226

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Paragraph 2
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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+ Details

OTHER REAL ESTATE OWNED AND OTHER REPOSSESSED ASSETS - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Residential
Real Estate Properties [Line Items]
Residential real estate in the process of foreclosure	$ 6.0	$ 0.4

OPERATING SEGMENTS AND RELATED INFORMATION - Schedule of Financial Results by Operating Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Interest income	$ 893,860	$ 523,681	$ 480,543
Intersegment interest income	0	0	0
Interest expense	324,251	201,070	159,922
Intersegment interest expense	0	0	0
Net interest income	569,609	322,611	320,621
Provision for credit losses	52,743	7,495	2,860
Net interest income after provision for credit losses	516,866	315,116	317,761
Noninterest income
All other noninterest income	18,898	22,828	12,839
Intersegment noninterest income	0	0	0
Total noninterest income	149,975	139,682	121,214
Revenue	719,584	462,293	441,835
Noninterest expense
Salaries, wages, and employee benefits	289,063	175,619	162,597
Data processing	43,181	27,124	23,708
Amortization of intangible assets	16,614	10,057	10,432
Interchange expense	5,194	6,001	6,864
Other noninterest expense	126,149	82,693	81,470
Intersegment noninterest expense	0	0	0
Total noninterest expense	480,201	301,494	285,071
Income (loss) before income taxes	186,640	153,304	153,904
Income taxes	51,378	39,613	31,339
Net income	135,262	113,691	122,565
Wealth management fees
Noninterest income
Noninterest income	69,426	63,630	57,309
Payment technology solutions
Noninterest income
Noninterest income	20,000	21,983	21,192
Treasury management services
Noninterest income
Noninterest income	17,322	8,377	7,435
Card services and ATM fees
Noninterest income
Noninterest income	18,048	13,424	12,305
Other service charges on deposit accounts
Noninterest income
Noninterest income	6,281	9,440	10,134
Other
Segment Reporting Information [Line Items]
Interest income	6	33	105
Intersegment interest income	(62)	(372)	(54)
Interest expense	14,193	17,944	19,005
Intersegment interest expense	(3,210)	(2,664)	(3,006)
Net interest income	(11,039)	(15,619)	(15,948)
Provision for credit losses	0	0	0
Net interest income after provision for credit losses	(11,039)	(15,619)	(15,948)
Noninterest income
All other noninterest income	6,454	942	(2,182)
Intersegment noninterest income	(3,383)	(2,473)	(2,703)
Total noninterest income	3,071	(1,531)	(4,885)
Revenue	(7,968)	(17,150)	(20,833)
Noninterest expense
Salaries, wages, and employee benefits	42,964	21,128	17,767
Data processing	338	538	541
Amortization of intangible assets	0	0	0
Interchange expense	0	0	0
Other noninterest expense	16,269	9,593	6,015
Intersegment noninterest expense	(23,291)	(15,996)	(16,976)
Total noninterest expense	36,280	15,263	7,347
Income (loss) before income taxes	(44,248)	(32,413)	(28,180)
Income taxes	(6,748)	(7,478)	(7,258)
Net income	(37,500)	(24,935)	(20,922)
Other \| Wealth management fees
Noninterest income
Noninterest income	0	0	0
Other \| Payment technology solutions
Noninterest income
Noninterest income	0	0	0
Other \| Treasury management services
Noninterest income
Noninterest income	0	0	0
Other \| Card services and ATM fees
Noninterest income
Noninterest income	0	0	0
Other \| Other service charges on deposit accounts
Noninterest income
Noninterest income	0	0	0
Banking \| Operating Segments
Segment Reporting Information [Line Items]
Interest income	893,854	523,648	480,438
Intersegment interest income	0	324	0
Interest expense	310,058	183,126	140,917
Intersegment interest expense	3,210	2,664	3,006
Net interest income	580,586	338,182	336,515
Provision for credit losses	52,743	7,495	2,860
Net interest income after provision for credit losses	527,843	330,687	333,655
Noninterest income
All other noninterest income	11,701	20,563	14,507
Intersegment noninterest income	1,795	1,402	1,149
Total noninterest income	55,147	53,206	45,530
Revenue	635,733	391,388	382,045
Noninterest expense
Salaries, wages, and employee benefits	206,640	117,730	111,834
Data processing	36,551	20,631	18,217
Amortization of intangible assets	15,735	8,916	8,963
Interchange expense	0	0	0
Other noninterest expense	104,371	67,528	70,798
Intersegment noninterest expense	18,427	11,457	13,178
Total noninterest expense	381,724	226,262	222,990
Income (loss) before income taxes	201,266	157,631	156,195
Income taxes	50,924	40,365	32,342
Net income	150,342	117,266	123,853
Banking \| Operating Segments \| Wealth management fees
Noninterest income
Noninterest income	0	0	0
Banking \| Operating Segments \| Payment technology solutions
Noninterest income
Noninterest income	0	0	0
Banking \| Operating Segments \| Treasury management services
Noninterest income
Noninterest income	17,322	8,377	7,435
Banking \| Operating Segments \| Card services and ATM fees
Noninterest income
Noninterest income	18,048	13,424	12,305
Banking \| Operating Segments \| Other service charges on deposit accounts
Noninterest income
Noninterest income	6,281	9,440	10,134
Wealth Management \| Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	0	0
Intersegment interest income	0	0	0
Interest expense	0	0	0
Intersegment interest expense	0	0	0
Net interest income	0	0	0
Provision for credit losses	0	0	0
Net interest income after provision for credit losses	0	0	0
Noninterest income
All other noninterest income	754	1,323	514
Intersegment noninterest income	0	0	0
Total noninterest income	70,180	64,953	57,823
Revenue	70,180	64,953	57,823
Noninterest expense
Salaries, wages, and employee benefits	28,870	26,631	24,474
Data processing	2,590	2,263	1,937
Amortization of intangible assets	879	1,141	1,469
Interchange expense	0	0	0
Other noninterest expense	2,691	2,836	2,503
Intersegment noninterest expense	3,330	3,096	2,698
Total noninterest expense	38,360	35,967	33,081
Income (loss) before income taxes	31,820	28,986	24,742
Income taxes	7,637	6,956	5,938
Net income	24,183	22,030	18,804
Wealth Management \| Operating Segments \| Wealth management fees
Noninterest income
Noninterest income	69,426	63,630	57,309
Wealth Management \| Operating Segments \| Payment technology solutions
Noninterest income
Noninterest income	0	0	0
Wealth Management \| Operating Segments \| Treasury management services
Noninterest income
Noninterest income	0	0	0
Wealth Management \| Operating Segments \| Card services and ATM fees
Noninterest income
Noninterest income	0	0	0
Wealth Management \| Operating Segments \| Other service charges on deposit accounts
Noninterest income
Noninterest income	0	0	0
FirsTech \| Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	0	0
Intersegment interest income	62	48	54
Interest expense	0	0	0
Intersegment interest expense	0	0	0
Net interest income	62	48	54
Provision for credit losses	0	0	0
Net interest income after provision for credit losses	62	48	54
Noninterest income
All other noninterest income	(11)	0	0
Intersegment noninterest income	1,588	1,071	1,554
Total noninterest income	21,577	23,054	22,746
Revenue	21,639	23,102	22,800
Noninterest expense
Salaries, wages, and employee benefits	10,589	10,130	8,522
Data processing	3,702	3,692	3,013
Amortization of intangible assets	0	0	0
Interchange expense	5,194	6,001	6,864
Other noninterest expense	2,818	2,736	2,154
Intersegment noninterest expense	1,534	1,443	1,100
Total noninterest expense	23,837	24,002	21,653
Income (loss) before income taxes	(2,198)	(900)	1,147
Income taxes	(435)	(230)	317
Net income	(1,763)	(670)	830
FirsTech \| Operating Segments \| Wealth management fees
Noninterest income
Noninterest income	0	0	0
FirsTech \| Operating Segments \| Payment technology solutions
Noninterest income
Noninterest income	20,000	21,983	21,192
FirsTech \| Operating Segments \| Treasury management services
Noninterest income
Noninterest income	0	0	0
FirsTech \| Operating Segments \| Card services and ATM fees
Noninterest income
Noninterest income	0	0	0
FirsTech \| Operating Segments \| Other service charges on deposit accounts
Noninterest income
Noninterest income	$ 0	$ 0	$ 0

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Cash and cash equivalents:
Cash and due from banks	$ 181,041	$ 129,444
Interest-bearing deposits	113,011	568,215
Total cash and cash equivalents	294,052	697,659
Debt securities available for sale	2,162,548	1,810,221
Debt securities held to maturity	746,385	826,630
Equity securities	14,916	15,862
Loans held for sale	5,752	3,657
Portfolio loans (net of ACL of $174,023 at December 31, 2025, and $83,404 at December 31, 2024)	13,393,776	7,613,683
Restricted bank stock	77,006	49,930
Premises and equipment, net	193,444	118,820
Goodwill	383,280	333,695
Other intangible assets, net	97,449	32,280
Cash surrender value of bank owned life insurance	260,402	185,087
Other assets	475,726	359,198
Total assets	18,104,736	12,046,722
Deposits:
Noninterest-bearing	3,659,421	2,719,907
Interest-bearing	11,246,537	7,262,583
Total deposits	14,905,958	9,982,490
Securities sold under agreements to repurchase	166,929	155,610
Long-term borrowings	113,806	0
Subordinated notes, net of unamortized issuance costs	99,395	227,723
Junior subordinated debt owed to unconsolidated trusts	77,328	74,815
Other liabilities	272,338	222,815
Total liabilities	15,635,754	10,663,453
Outstanding commitments and contingent liabilities (see Notes 7 and 18)
Stockholders’ equity
Preferred stock, $0.001 par value, liquidation preference $222,750 at December 31, 2025 and zero at December 31, 2024	0	0
Common stock, $0.001 par value	93	60
Additional paid-in capital	2,375,511	1,360,530
Retained earnings	336,707	294,054
AOCI	(124,473)	(207,039)
Total stockholders’ equity before treasury stock	2,587,838	1,447,605
Treasury stock at cost	(118,856)	(64,336)
Total stockholders’ equity	2,468,982	1,383,269
Total liabilities and stockholders’ equity	$ 18,104,736	$ 12,046,722
Preferred shares issued (in shares)	222,750	0
Preferred shares outstanding (in shares)	222,750	0
Common shares issued (in shares)	92,694,541	59,546,273
Less: Treasury (in shares)	5,070,111	2,650,292
Common shares outstanding (in shares)	87,624,430	56,895,981

DEPOSITS

12 Months Ended

Dec. 31, 2025

Deposits [Abstract]

DEPOSITS

NOTE 9. DEPOSITS

The composition of Busey’s deposits is presented in the table below:


	As of December 31,
(dollars in thousands)	2025		2024
Deposits
Noninterest-bearing demand deposits	$	3,659,421	$	2,719,907
Interest-bearing transaction deposits	3,119,475		2,423,237
Saving deposits and money market deposits	5,697,172		3,348,711
Time deposits	2,429,890		1,490,635
Total deposits	$	14,905,958	$	9,982,490

Additional information about Busey’s deposits is presented in the table below:


	As of December 31,
(dollars in thousands)	2025		2024
Brokered interest-bearing transaction deposits	$	50,136	$	—
Brokered savings deposits and money market deposits	10,000		6,002
Brokered time deposits	10,004		7,088
Total time deposits with a minimum denomination of $100,000	1,674,862		860,193
Total time deposits with a minimum denomination that meets or exceeds the FDIC insurance limit of $250,000	876,207		334,503

Scheduled maturities of time deposits are presented in the table below:


(dollars in thousands)	As of December 31, 2025
Time deposits by schedule of maturities

2026	$	2,364,343
2027	46,913
2028	10,952
2029	4,593
2030	2,667
Thereafter	422
Time deposits	$	2,429,890

BORROWINGS - Schedule of Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Disclosure [Abstract]
Securities sold under agreements to repurchase	$ 166,929	$ 155,610
Weighted average rate for securities sold under agreements to repurchase	2.22%	2.63%

- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-20

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
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-Paragraph 15
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-URI https://asc.fasb.org/1943274/2147483444/210-20-55-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-10

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483466/210-20-50-3

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-12A(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column A)(Footnote 4)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

+ Details

OUTSTANDING COMMITMENTS AND CONTINGENT LIABILITIES

12 Months Ended

Dec. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

OUTSTANDING COMMITMENTS AND CONTINGENT LIABILITIES

NOTE 18. OUTSTANDING COMMITMENTS AND CONTINGENT LIABILITIES

Credit Commitments and Contingencies

A summary of the contractual amount of Busey’s exposure to off-balance-sheet risk relating to the Company’s commitments to extend credit and standby letters of credit follows:


	As of December 31,
(dollars in thousands)	2025		2024
Off-Balance Sheet Commitments
Commitments to extend credit	$	4,696,867	$	2,512,714
Standby letters of credit	123,746		35,464
Total commitments	$	4,820,613	$	2,548,178

For additional information about Busey’s accounting policies related to credit commitments and contingencies, see “Off-Balance Sheet Arrangements” in “Note 1. Significant Accounting Policies.”

Legal Matters

Busey is a party to legal actions which arise in the normal course of its business activities. Additionally, on November 25, 2025, First Busey Corporation filed two lawsuits against the Illinois Secretary of State in connection with an ongoing dispute regarding the amount of franchise taxes, penalties, interest, fees, and charges purportedly due from First Busey Corporation to the Illinois Secretary of State, as described in more detail under the heading “Franchise Tax Matter” below. Legal and administrative proceedings are subject to inherent uncertainties. While unfavorable outcomes could occur, Busey does not believe at this time that any potential liabilities relating to pending or potential legal matters are likely to have a material impact on Busey's results of operations or financial position.

Franchise Tax Matter

In 2021, First Busey Corporation received an inquiry from the Illinois Secretary of State, pursuant to which the Illinois Secretary of State asked for additional information regarding certain of First Busey Corporation’s franchise tax filings and the calculation of amounts due thereunder. The franchise tax is established by the Illinois Business Corporation Act (“BCA”) 805 ILCS 5/1 et seq., and is a tax imposed on foreign and domestic corporations for the privilege of conducting business in Illinois. First Busey Corporation has been cooperating with the inquiry since the initial outreach from the Illinois Secretary of State in 2021 and in October 2024 delivered additional BCA forms requested by the Illinois Secretary of State, with a full reservation of rights by First Busey Corporation.

On March 20, 2025, the Illinois Secretary of State requested that First Busey Corporation resubmit the requested forms using a proposed methodology for paid-in capital that First Busey Corporation views as inconsistent with the Illinois Secretary of State’s past practice, and existing statutory and case law. Accordingly, on May 14, 2025, within the Illinois Secretary of State’s requested timeframe, First Busey Corporation informed the Illinois Secretary of State that it would not resubmit the requested forms with the methodology that First Busey Corporation disputes and requested that the parties instead continue good faith discussions. On July 2, 2025, First Busey Corporation received a notice of hearing from the Illinois Secretary of State indicating that an administrative hearing has been scheduled to “ascertain” the required amount of franchise taxes, penalties, interest, fees, and charges purportedly due from First Busey Corporation to the Illinois Secretary of State. In the notice, the Illinois Secretary of State requested a determination of an amount due that the Illinois Secretary of State preliminarily estimated at in excess of $28.0 million, including in excess of $17.4 million in interest and approximately $0.3 million in penalties. First Busey Corporation disagrees with the Illinois Secretary of State’s preliminary estimate and believes that the Illinois Secretary of State’s request is contrary not only to the Illinois Secretary of State’s past practice, but also existing statutory and case law. First Busey Corporation intends to vigorously defend itself against the Illinois Secretary of State’s notice, including through appropriate judicial relief. To that end, on July 31, 2025, First Busey Corporation filed a special appearance with the Illinois Secretary of State’s Department of Administrative Hearings solely for the limited purpose of contesting the jurisdiction of the Illinois Secretary of State to initiate and conduct the administrative hearing, and on November 25, 2025, First Busey Corporation filed two lawsuits against the Illinois Secretary of State in connection with this matter: one in federal court, First Busey Corporation v. Alexi Giannoulias, No. 3:25-cv-50488 (N.D. Ill.); and one in Illinois state court, First Busey Corporation v. Alexi Giannoulias, No. 25-MR-283 (Sixth Judicial Circuit of Illinois, Champaign County). Both lawsuits and the administrative hearing remain pending.

Where a loss is believed to be reasonably possible, but not probable, or the loss cannot be reasonably estimated, no accrual is required. Given the underlying disagreement between First Busey Corporation and the Illinois Secretary of State on the proper methodology for calculating any franchise tax owed, the loss cannot be reasonably estimated. It is reasonably possible that this matter could require First Busey Corporation to pay additional taxes, including potential penalties and interest, or make other expenditures or accrue liabilities in amounts that could not be reasonably estimated as of December 31, 2025. If the likelihood of potential liabilities elevates and First Busey Corporation becomes able to reasonably estimate the loss, requiring an accrual, the potential future liabilities could be material in the period(s) in which they are recorded.

DEBT SECURITIES

12 Months Ended

Dec. 31, 2025

Investments, Debt and Equity Securities [Abstract]

DEBT SECURITIES

NOTE 3. DEBT SECURITIES

Busey's portfolio of debt securities includes both available for sale and held to maturity securities. The tables below provide the amortized cost, unrealized or unrecognized gains and losses, and fair values of debt securities, summarized by major category:


	As of December 31, 2025
	Amortized Cost		Unrealized				Fair Value
(dollars in thousands)			Gross Gains		Gross Losses
Debt securities available for sale1

Obligations of U.S. government corporations and agencies	$	111,876	$	250	$	(80)	$	112,046
Obligations of states and political subdivisions	270,682		3,089		(9,898)		263,873
Asset-backed securities	265,203		412		(35)		265,580
Commercial mortgage-backed securities	143,522		611		(11,191)		132,942
Residential mortgage-backed securities	1,464,347		9,336		(129,267)		1,344,416
Corporate debt securities	45,215		187		(1,711)		43,691
Total debt securities available for sale	$	2,300,845	$	13,885	$	(152,182)	$	2,162,548



	Amortized Cost		Unrecognized				Fair Value
			Gross Gains		Gross Losses
Debt securities held to maturity
Commercial mortgage-backed securities	$	367,825	$	—	$	(65,210)	$	302,615
Residential mortgage-backed securities	378,560		—		(55,218)		323,342
Total debt securities held to maturity	$	746,385	$	—	$	(120,428)	$	625,957

___________________________________________

1.Includes securities marked at par, with no gain or loss to report.


	As of December 31, 2024
	Amortized Cost		Unrealized				Fair Value
(dollars in thousands)			Gross Gains		Gross Losses
Debt securities available for sale1

Obligations of U.S. government corporations and agencies	$	1,408	$	—	$	(8)	$	1,400
Obligations of states and political subdivisions	156,534		31		(16,736)		139,829
Asset-backed securities	336,379		181		(3)		336,557
Commercial mortgage-backed securities	107,305		—		(15,131)		92,174
Residential mortgage-backed securities	1,279,090		19		(191,899)		1,087,210
Corporate debt securities	159,236		363		(6,548)		153,051
Total debt securities available for sale	$	2,039,952	$	594	$	(230,325)	$	1,810,221



	Amortized Cost		Unrecognized				Fair Value
			Gross Gains		Gross Losses
Debt securities held to maturity
Commercial mortgage-backed securities	$	415,530	$	—	$	(77,242)	$	338,288
Residential mortgage-backed securities	411,100		—		(74,335)		336,765
Total debt securities held to maturity	$	826,630	$	—	$	(151,577)	$	675,053

___________________________________________

1.Includes securities marked at par, with no gain or loss to report.

Maturities of Debt Securities

Amortized cost and fair value of debt securities, by contractual maturity or pre-refunded date, are shown below. Mortgages underlying mortgage-backed securities and asset-backed securities may be called or prepaid; therefore, actual maturities could differ from the contractual maturities. All mortgage-backed securities were issued by U.S. government corporations and agencies.


	As of December 31, 2025
(dollars in thousands)	Amortized Cost		Fair Value
Debt securities available for sale
Due in one year or less	$	10,725	$	10,684
Due after one year through five years	66,180		63,335
Due after five years through ten years	371,411		355,748
Due after ten years	1,852,529		1,732,781
Debt securities available for sale	$	2,300,845	$	2,162,548

Debt securities held to maturity
Due in one year or less	$	20,000	$	19,896
Due after one year through five years	37,076		35,836

Due after ten years	689,309		570,225
Debt securities held to maturity	$	746,385	$	625,957

Gains and Losses on Debt Securities Available for Sale

Realized gains and losses related to sales and calls of debt securities available for sale are summarized as follows:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Realized gains and losses on debt securities
Gross gains on debt securities	$	321	$	1	$	20
Gross (losses) on debt securities1	(15,563)		(7,034)		(5,523)
Realized net gains (losses) on debt securities2	$	(15,242)	$	(7,033)	$	(5,503)

___________________________________________

2.Net gains (losses) on sales of securities reported on the Consolidated Statements of Income include, as applicable, the sale of equity securities, which are excluded in this table.

Debt securities with carrying amounts of $744.2 million on December 31, 2025, and $871.4 million on December 31, 2024, were pledged as collateral for public deposits, securities sold under agreements to repurchase, and for other purposes as required.

Debt Securities in an Unrealized or Unrecognized Loss Position


	As of December 31, 2025
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Debt securities available for sale

Obligations of U.S. government corporations and agencies	$	39,156	$	(80)	$	—	$	—	$	39,156	$	(80)
Obligations of states and political subdivisions	28,592		(361)		92,205		(9,537)		120,797		(9,898)
Asset-backed securities	10,005		(35)		—		—		10,005		(35)
Commercial mortgage-backed securities	4,986		(48)		71,830		(11,143)		76,816		(11,191)
Residential mortgage-backed securities	84,023		(708)		765,361		(128,559)		849,384		(129,267)
Corporate debt securities	5,969		(20)		29,097		(1,691)		35,066		(1,711)
Debt securities available for sale with gross unrealized losses	$	172,731	$	(1,252)	$	958,493	$	(150,930)	$	1,131,224	$	(152,182)



	12 months or more			Total
		Fair Value		Unrecognized Losses		Fair Value		Unrecognized Losses
Debt securities held to maturity
Commercial mortgage-backed securities		$	302,615	$	(65,210)	$	302,615	$	(65,210)
Residential mortgage-backed securities		323,342		(55,218)		323,342		(55,218)
Debt securities held to maturity with gross unrecognized losses		$	625,957	$	(120,428)	$	625,957	$	(120,428)


	As of December 31, 2024
	Less than 12 months				12 months or more				Total
(dollars in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Debt securities available for sale

Obligations of U.S. government corporations and agencies	$	—	$	—	$	1,328	$	(8)	$	1,328	$	(8)
Obligations of states and political subdivisions	11,234		(209)		119,723		(16,527)		130,957		(16,736)
Asset-backed securities	14,997		(3)		—		—		14,997		(3)
Commercial mortgage-backed securities	6,238		(42)		85,936		(15,089)		92,174		(15,131)
Residential mortgage-backed securities	152,081		(640)		930,642		(191,259)		1,082,723		(191,899)
Corporate debt securities	598		(1)		143,966		(6,547)		144,564		(6,548)
Debt securities available for sale with gross unrealized losses	$	185,148	$	(895)	$	1,281,595	$	(229,430)	$	1,466,743	$	(230,325)



	12 months or more			Total
		Fair Value		Unrecognized Losses		Fair Value		Unrecognized Losses
Debt securities held to maturity
Commercial mortgage-backed securities		$	338,288	$	(77,242)	$	338,288	$	(77,242)
Residential mortgage-backed securities		336,765		(74,335)		336,765		(74,335)
Debt securities held to maturity with gross unrecognized losses		$	675,053	$	(151,577)	$	675,053	$	(151,577)

Additional information about debt securities in an unrealized or unrecognized loss position is presented in the tables below:


	As of December 31, 2025
(dollars in thousands)	Available for Sale			Held to Maturity			Total
Debt securities with gross unrealized or unrecognized losses, fair value	$	1,131,224		$	625,957		$	1,757,181
Gross unrealized or unrecognized losses on debt securities	152,182			120,428			272,610
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	13.5		%	19.2		%	15.5		%

Count of debt securities	637			52			689
Count of debt securities in an unrealized or unrecognized loss position	376			52			428


	As of December 31, 2024
(dollars in thousands)	Available for Sale			Held to Maturity			Total
Debt securities with gross unrealized or unrecognized losses, fair value	$	1,466,743		$	675,053		$	2,141,796
Gross unrealized or unrecognized losses on debt securities	230,325			151,577			381,902
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	15.7		%	22.5		%	17.8		%

Count of debt securities	677			55			732
Count of debt securities in an unrealized or unrecognized loss position	586			55			641

Unrealized and unrecognized losses were related to changes in market interest rates and market conditions that do not represent credit-related impairments. Unless part of a corporate strategy or restructuring plan, Busey does not intend to sell securities that are in an unrealized or unrecognized loss position, and it is more likely than not that Busey will recover the amortized cost prior to being required to sell the debt securities. Full collection of the amounts due according to the contractual terms of the debt securities is expected; therefore, no ACL has been recorded in relation to debt securities, and the impairment related to noncredit factors on debt securities available for sale is recognized in AOCI, net of applicable taxes. As of December 31, 2025, Busey did not hold general obligation bonds of any single issuer, the aggregate of which exceeded 10% of Busey’s stockholders’ equity.

For additional information about Busey’s accounting policies related to debt securities, see “Debt Securities Available for Sale” and “Debt Securities Held to Maturity” in “Note 1. Significant Accounting Policies.”

DEBT SECURITIES - Schedule of Realized Gains and Losses on Debt Securities (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Realized gains and losses on debt securities
Gross gains on debt securities			$ 321	$ 1	$ 20
Gross (losses) on debt securities			(15,563)	(7,034)	(5,523)
Realized net gains (losses) on debt securities			$ (15,242)	$ (7,033)	$ (5,503)
Debt securities, available for sale, sold	$ 205,600	$ 108,200
Pre-tax loss on sale of debt securities available for sale	15,500	6,800
Debt securities available for sale sold, tax benefit	$ 4,300	$ 1,800

REGULATORY CAPITAL

12 Months Ended

Dec. 31, 2025

Banking and Thrift, Other Disclosure [Abstract]

REGULATORY CAPITAL

NOTE 12. REGULATORY CAPITAL

First Busey and Busey Bank are subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory—and possibly additional discretionary—actions by regulators that, if undertaken, could have a direct material effect on First Busey's Consolidated Financial Statements. Capital amounts and classification also are subject to qualitative judgments by regulators about components, risk weightings, and other factors.

Banking regulations identify five capital categories for insured depository institutions: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized. As of December 31, 2025 and 2024, all capital ratios of First Busey and Busey Bank exceeded well capitalized levels under the applicable regulatory capital adequacy guidelines. Management believes that no events or changes have occurred subsequent to December 31, 2025, that would change this designation.

Capital Amounts and Ratios

The following tables summarize regulatory capital requirements applicable to First Busey and Busey Bank:


	As of December 31, 2025
	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized
(dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common equity Tier 1 capital to risk weighted assets
First Busey	$	1,920,388	12.43	%	$	694,987	4.50	%	$	1,003,870	6.50	%
Busey Bank	$	2,150,048	13.97	%	$	692,654	4.50	%	$	1,000,500	6.50	%

Tier 1 capital to risk weighted assets
First Busey	$	2,143,138	13.88	%	$	926,650	6.00	%	$	1,235,533	8.00	%
Busey Bank	$	2,150,048	13.97	%	$	923,539	6.00	%	$	1,231,385	8.00	%

Total capital to risk weighted assets
First Busey	$	2,459,847	15.93	%	$	1,235,533	8.00	%	$	1,544,416	10.00	%
Busey Bank	$	2,287,179	14.86	%	$	1,231,385	8.00	%	$	1,539,231	10.00	%

Leverage ratio of Tier 1 capital to average assets
First Busey	$	2,143,138	11.93	%	$	718,334	4.00	%	N/A		N/A
Busey Bank	$	2,150,048	12.00	%	$	716,476	4.00	%	$	895,596	5.00	%


	As of December 31, 2024
	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized
(dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common equity Tier 1 capital to risk weighted assets
First Busey	$	1,237,301	14.10	%	$	394,840	4.50	%	$	570,325	6.50	%
Busey Bank	$	1,438,296	16.46	%	$	393,277	4.50	%	$	568,067	6.50	%

Tier 1 capital to risk weighted assets
First Busey	$	1,314,301	14.98	%	$	526,453	6.00	%	$	701,938	8.00	%
Busey Bank	$	1,438,296	16.46	%	$	524,369	6.00	%	$	699,159	8.00	%

Total capital to risk weighted assets
First Busey	$	1,625,943	18.53	%	$	701,938	8.00	%	$	877,422	10.00	%
Busey Bank	$	1,520,938	17.40	%	$	699,159	8.00	%	$	873,949	10.00	%

Leverage ratio of Tier 1 capital to average assets
First Busey	$	1,314,301	11.06	%	$	475,348	4.00	%	N/A		N/A
Busey Bank	$	1,438,296	12.14	%	$	473,878	4.00	%	$	592,347	5.00	%

Capital Conservation Buffer

In July 2013, U.S. federal banking authorities approved the Basel III Rule for strengthening international capital standards. The Basel III Rule introduced a capital conservation buffer, composed entirely of common equity Tier 1 capital, which is added to the minimum risk-weighted asset ratios. The capital conservation buffer is not a minimum capital requirement; however, banking institutions with a ratio of common equity Tier 1 capital to risk-weighted assets below the capital conservation buffer will face constraints on dividends, equity repurchases, and discretionary bonus payments based on the amount of the shortfall. In order to refrain from restrictions on dividends, equity repurchases, and discretionary bonus payments, banking institutions must maintain minimum ratios of (1) common equity Tier 1 capital to risk-weighted assets of at least 7.0%, (2) Tier 1 capital to risk-weighted assets of at least 8.5%, and (3) total capital to risk-weighted assets of at least 10.5%.

Subsidiary Dividend Payments

First Busey Corporation’s ability to pay cash dividends to its stockholders and to service its debt is dependent on the receipt of cash dividends from its subsidiaries. Under applicable regulatory requirements, an Illinois state-chartered bank, such as Busey Bank, generally may pay dividends only out of net profits. Busey Bank paid $160.0 million, $100.0 million, and $90.0 million in dividends to First Busey Corporation during the years ended December 31, 2025, 2024, and 2023, respectively.

- Definition

The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union.

+ References + Details

FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis

The following tables summarize financial assets and financial liabilities measured at estimated fair value on a recurring basis:


	As of December 31, 2025
(dollars in thousands)	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
Debt securities available for sale:

Obligations of U.S. government corporations and agencies	$	—	$	112,046	$	—	$	112,046
Obligations of states and political subdivisions	—		263,873		—		263,873
Asset-backed securities	—		265,580		—		265,580
Commercial mortgage-backed securities	—		132,942		—		132,942
Residential mortgage-backed securities	—		1,344,416		—		1,344,416
Corporate debt securities	—		43,691		—		43,691
Equity securities	155		14,761		—		14,916
Derivative assets	—		30,902		30		30,932
Derivative liabilities	—		42,155		65		42,220


	As of December 31, 2024
(dollars in thousands)	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
Debt securities available for sale:

Obligations of U.S. government corporations and agencies	$	—	$	1,400	$	—	$	1,400
Obligations of states and political subdivisions	—		139,829		—		139,829
Asset-backed securities	—		336,557		—		336,557
Commercial mortgage-backed securities	—		92,174		—		92,174
Residential mortgage-backed securities	—		1,087,210		—		1,087,210
Corporate debt securities	—		153,051		—		153,051
Equity securities	5,567		10,295		—		15,862
Derivative assets	—		30,368		5		30,373
Derivative liabilities	—		58,099		—		58,099

Activity for risk participation agreements, which are financial assets measured at estimated fair value on a recurring basis using Level 3, is summarized in the tables below:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024
Beginning Balance		$	5	$	15
Gains (losses) recognized in earnings	Other expense	117		(26)

Purchases		(171)		16
Sales		55		—
Assumed in acquisition		(41)		—




Ending Balance		$	(35)	$	5

Schedule of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

The following tables summarize assets and liabilities measured at estimated fair value on a non-recurring basis:


	As of December 31, 2025
(dollars in thousands)	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
Loans evaluated individually, net of related allowance	$	—	$	—	$	19,604	$	19,604
OREO and other repossessed assets with subsequent impairment	—		—		4,409		4,409
Bank property held for sale with impairment	—		—		1,855		1,855


	As of December 31, 2024
(dollars in thousands)	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
Loans evaluated individually, net of related allowance	$	—	$	—	$	616	$	616

Bank property held for sale with impairment	—		—		2,841		2,841

Schedule of Quantitative Information About Level 3 Fair Value Measurements

The following tables present additional quantitative information about assets measured at estimated fair value on a non-recurring basis using Level 3 inputs:

As of December 31, 2025

(dollars in thousands)

Fair Value

Valuation
Techniques

Unobservable
Input

Range
(Weighted Average)

Loans evaluated individually, net of related allowance

19,604

Appraisal of collateral

Appraisal adjustments

-1.6% to -100.0%

(-44.6)

OREO and other repossessed assets with subsequent impairment

4,409

Appraisal of collateral

Appraisal adjustments

-2.8% to -24.1%

(-4.5)%

Bank property held for sale with impairment

1,855

Appraisal of collateral or real estate listing price

Appraisal adjustments

-9.0% to -58.0%

(-39.4)

As of December 31, 2024

(dollars in thousands)

Fair Value

Valuation
Techniques

Unobservable
Input

Range
(Weighted Average)

Loans evaluated individually, net of related allowance

616

Appraisal of collateral

Appraisal adjustments

-25.0% to -100.0%

(-74.9)%

Bank property held for sale with impairment

2,841

Appraisal of collateral or real estate listing price

Appraisal adjustments

-9.0% to -76.7%

(-51.8)%

Schedule of Estimated Fair Values of Financial Instruments

Fair values of financial instruments that are not carried at fair value on Busey’s Consolidated Balance Sheets were estimated as follows:


	As of December 31, 2025				As of December 31, 2024
(dollars in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial assets
Level 1 inputs:
Cash and cash equivalents	$	294,052	$	294,052	$	697,659	$	697,659
Level 2 inputs:
Debt securities held to maturity	746,385		625,957		826,630		675,053
Loans held for sale	5,752		5,886		3,657		3,726
Restricted bank stock	77,006		77,006		49,930		49,930
Accrued interest receivable	71,788		71,788		45,141		45,141
Level 3 inputs:
Portfolio loans, net	13,393,776		13,472,907		7,613,683		7,426,158
Mortgage servicing rights	1,459		5,176		1,304		5,627
Other servicing rights	2,086		2,193		1,482		1,591

Financial liabilities
Level 2 inputs:
Time deposits	$	2,429,890	$	2,425,290	$	1,490,635	$	1,481,591
Securities sold under agreements to repurchase	166,929		166,929		155,610		155,610

Long-term borrowings	113,806		113,853		—		—
Junior subordinated debt owed to unconsolidated trusts	77,328		71,407		74,815		67,314
Accrued interest payable	25,372		25,372		21,129		21,129
Level 3 inputs:

Subordinated notes, net of unamortized issuance costs	99,395		94,500		227,723		219,043

PREMISES AND EQUIPMENT

12 Months Ended

Dec. 31, 2025

Property, Plant and Equipment [Abstract]

PREMISES AND EQUIPMENT

NOTE 6. PREMISES AND EQUIPMENT

Premises and equipment are summarized in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Premises and equipment
Land and improvements	$	50,147	$	42,565
Buildings and improvements	194,925		130,185
Furniture and equipment	64,108		53,945
Premises and equipment, gross	309,180		226,695
Accumulated depreciation and amortization	(115,736)		(107,875)
Premises and equipment, net	$	193,444	$	118,820

Depreciation expense is presented in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Depreciation and amortization expense	$	12,926	$	9,503	$	9,488

For additional information about Busey’s accounting policies related to premises and equipment, see “Premises and Equipment” in “Note 1. Significant Accounting Policies.”

FAIR VALUE MEASUREMENTS - Schedule of Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financial assets
Debt securities held to maturity	$ 625,957	$ 675,053
Restricted bank stock	77,006	49,930
Portfolio loans, net	13,393,776	7,613,683
Mortgage servicing rights	667,900	582,500
Financial liabilities
Junior subordinated debt owed to unconsolidated trusts	77,328	74,815
Level 1 Inputs \| Carrying Amount
Financial assets
Cash and cash equivalents	294,052	697,659
Level 1 Inputs \| Fair Value
Financial assets
Cash and cash equivalents	294,052	697,659
Level 2 Inputs \| Carrying Amount
Financial assets
Debt securities held to maturity	746,385	826,630
Loans held for sale	5,752	3,657
Restricted bank stock	77,006	49,930
Accrued interest receivable	71,788	45,141
Financial liabilities
Time deposits	2,429,890	1,490,635
Securities sold under agreements to repurchase	166,929	155,610
Junior subordinated debt owed to unconsolidated trusts	77,328	74,815
Accrued interest payable	25,372	21,129
Level 2 Inputs \| Carrying Amount \| Long-term borrowings
Financial liabilities
Long-term borrowings and Subordinated notes, net of unamortized issuance costs	113,806	0
Level 2 Inputs \| Fair Value
Financial assets
Debt securities held to maturity	625,957	675,053
Loans held for sale	5,886	3,726
Restricted bank stock	77,006	49,930
Accrued interest receivable	71,788	45,141
Financial liabilities
Time deposits	2,425,290	1,481,591
Securities sold under agreements to repurchase	166,929	155,610
Junior subordinated debt owed to unconsolidated trusts	71,407	67,314
Accrued interest payable	25,372	21,129
Level 2 Inputs \| Fair Value \| Long-term borrowings
Financial liabilities
Long-term borrowings and Subordinated notes, net of unamortized issuance costs	113,853	0
Level 3 Inputs \| Carrying Amount
Financial assets
Portfolio loans, net	13,393,776	7,613,683
Mortgage servicing rights	1,459	1,304
Other servicing rights	2,086	1,482
Level 3 Inputs \| Carrying Amount \| Subordinated Debt
Financial liabilities
Long-term borrowings and Subordinated notes, net of unamortized issuance costs	99,395	227,723
Level 3 Inputs \| Fair Value
Financial assets
Portfolio loans, net	13,472,907	7,426,158
Mortgage servicing rights	5,176	5,627
Other servicing rights	2,193	1,591
Level 3 Inputs \| Fair Value \| Subordinated Debt
Financial liabilities
Long-term borrowings and Subordinated notes, net of unamortized issuance costs	$ 94,500	$ 219,043

STOCK-BASED COMPENSATION - Schedule of Unamortized Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Share-based Compensation
Total unamortized stock-based compensation	$ 15,309	$ 10,317
SSARs
Share-based Compensation
Total unamortized stock-based compensation	98	0
RSU awards
Share-based Compensation
Total unamortized stock-based compensation	9,236	7,093
PSU awards
Share-based Compensation
Total unamortized stock-based compensation	5,769	3,043
DSU awards
Share-based Compensation
Total unamortized stock-based compensation	$ 206	$ 181
Busey Awards \| 2020 Equity Plan
Share-based Compensation
Weighted average period over which expense is to be recognized on awards issued under Busey's 2020 Equity Plan	1 year 9 months 18 days	2 years 6 months
CrossFirst Replacement Awards
Share-based Compensation
Weighted average period over which expense is to be recognized on awards issued under Busey's 2020 Equity Plan	1 year 2 months 12 days

SIGNIFICANT ACCOUNTING POLICIES - Stock-Based Employee Compensation (Details) - shares			12 Months Ended
	Mar. 26, 2025	Apr. 14, 2023	Dec. 31, 2025
RSU awards
Share-based Compensation
Number of shares of common stock per award (in shares)			1
RSU awards \| Management
Share-based Compensation
Number of shares of common stock per award (in shares)			1
RSU awards \| Minimum
Share-based Compensation
Requisite service periods			1 year
RSU awards \| Maximum
Share-based Compensation
Requisite service periods			5 years
PSU awards
Share-based Compensation
Number of shares of common stock per award (in shares)			1
PSU awards \| Management
Share-based Compensation
Number of shares of common stock per award (in shares)			1
DSU awards
Share-based Compensation
Number of shares of common stock per award (in shares)			1
Vesting period			1 year
Settlement period			30 days
ESPP
Share-based Compensation
Percentage of discount to market price			15.00%
2020 Equity Plan
Share-based Compensation
Increase in the number of shares authorized for issuance (in shares)		1,350,000
2020 Equity Plan \| RSU awards \| Minimum \| Management
Share-based Compensation
Requisite service periods	1 year

TRANSACTIONS WITH RELATED PARTIES (Tables)

12 Months Ended

Dec. 31, 2025

Schedule of the Analysis of the Changes in Loans to Related Parties

The following table presents changes in loans to related parties, as a group:


(dollars in thousands)	As of and for the Year Ended December 31, 2025
Balance of loans to related parties, December 31, 2024	$	98,011
Change in relationship	(62,108)
New loans/advances	2,383
Repayments	(3,373)
Balance of loans to related parties, December 31, 2025	$	34,913

Unused commitments to directors and executive officers	$	35,863

LEASES

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

LEASES

NOTE 7. LEASES

Busey as The Lessee

Busey’s leases consisting primarily of real estate leases for banking centers, ATM locations, and office space, as well as equipment leases. The following table summarizes lease-related balances that Busey reported on its Consolidated Balance Sheets:


		As of December 31,
(dollars in thousands)	Location	2025		2024
Lease balances
Right of use assets:
Operating leases	Other assets	$	30,204	$	10,608
Finance leases	Premises and equipment, net	5,155		—
Total right of use assets		$	35,359	$	10,608

Lease liabilities:
Operating leases	Other liabilities	$	32,597	$	11,040
Finance leases	Long-term borrowings	6,223		—
Total lease liabilities		$	38,820	$	11,040

Lease terms are summarized in the following table:


	As of December 31,
	2025		2024
Lease terms
Weighted average remaining lease terms:
Operating leases	7.41 years		7.55 years
Finance leases	16.26 years		N/A
Weighted average discount rates:
Operating leases	4.24	%	3.77	%
Finance leases	5.10	%	N/A

The following table presents lease costs that Busey reported on its Consolidated Statements of Income:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024		2023
Lease costs
Operating lease costs:
Premises rent expense	Net occupancy expense of premises	$	5,891	$	2,335	$	2,379
Equipment rent expense	Furniture and equipment expenses	29		17		16
Finance lease costs:
Amortization expense	Net occupancy expense of premises	269		—		—
Interest expense	Long-term borrowings	267		—		—
Variable lease costs	Net occupancy expense of premises	60		58		38
Short-term lease costs	Net occupancy expense of premises	58		83		50
Total lease cost		$	6,574	$	2,493	$	2,483

Cash paid for amounts included in the measurement of lease liabilities is presented in the following table:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Cash flows related to leases
Operating cash flows from operating leases	$	10,185	$	3,992	$	4,173
Operating cash flows from finance leases	267		—		—
Financing cash flows from finance leases	141		—		—

Right of use assets obtained in exchange for operating lease liabilities1	25,590		1,579		231
Right of use assets obtained in exchange for finance lease liabilities1	6,365		—		—

___________________________________________

1.The year ended December 31, 2025, included $23.2 million for operating and $6.4 million for financing right of use assets recognized in connection with the acquisition of CrossFirst. The year ended December 31, 2024, included $0.1 million right of use assets recognized in connection with the acquisition of M&M, and an additional $0.7 million recognized in connection with a lease amendment that was executed subsequent to the M&M acquisition for a lease that was obtained in that acquisition. Additional information about assets and liabilities obtained in business combinations can be found in “Note 2. Business Combinations.”

Future undiscounted payments for leases with initial terms of one year or more are presented in the table below:


	As of December 31, 2025
(dollars in thousands)	Operating Leases		Finance Leases
Rent commitments

2026	$	6,255	$	490
2027	5,929		527
2028	5,406		540
2029	4,407		540
2030	3,505		540
Thereafter	12,690		6,625
Total undiscounted cash flows	38,192		9,262
Less: Amounts representing interest	5,595		3,039
Present value of net future minimum lease payments	$	32,597	$	6,223

As of December 31, 2025, Busey had commitments totaling $6.0 million for three lease contracts with future accounting commencement dates.

Busey as The Lessor

Busey leases office and parking spaces to outside parties. Revenues recorded in connection with these leases, reported in other income on Busey’s Consolidated Statements of Income, are summarized in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Rental income	$	860	$	820	$	724

Noncancellable terms for these leases, all of which are operating leases, extend through 2030. Under the terms of these lease agreements, Busey is entitled to receive aggregate future minimum lease payments as shown in the table below:


(dollars in thousands)	As of December 31, 2025
Rents to be received

2026	$	804
2027	515
2028	377
2029	197
2030	117
Thereafter	—
Total lease payments from operating leases	$	2,010

For additional information about Busey’s accounting policies related to leases, see “Leases” in “Note 1. Significant Accounting Policies.”

LEASES

NOTE 7. LEASES

Busey as The Lessee


		As of December 31,
(dollars in thousands)	Location	2025		2024
Lease balances
Right of use assets:
Operating leases	Other assets	$	30,204	$	10,608
Finance leases	Premises and equipment, net	5,155		—
Total right of use assets		$	35,359	$	10,608

Lease liabilities:
Operating leases	Other liabilities	$	32,597	$	11,040
Finance leases	Long-term borrowings	6,223		—
Total lease liabilities		$	38,820	$	11,040

Lease terms are summarized in the following table:


	As of December 31,
	2025		2024
Lease terms
Weighted average remaining lease terms:
Operating leases	7.41 years		7.55 years
Finance leases	16.26 years		N/A
Weighted average discount rates:
Operating leases	4.24	%	3.77	%
Finance leases	5.10	%	N/A

The following table presents lease costs that Busey reported on its Consolidated Statements of Income:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024		2023
Lease costs
Operating lease costs:
Premises rent expense	Net occupancy expense of premises	$	5,891	$	2,335	$	2,379
Equipment rent expense	Furniture and equipment expenses	29		17		16
Finance lease costs:
Amortization expense	Net occupancy expense of premises	269		—		—
Interest expense	Long-term borrowings	267		—		—
Variable lease costs	Net occupancy expense of premises	60		58		38
Short-term lease costs	Net occupancy expense of premises	58		83		50
Total lease cost		$	6,574	$	2,493	$	2,483

Cash paid for amounts included in the measurement of lease liabilities is presented in the following table:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Cash flows related to leases
Operating cash flows from operating leases	$	10,185	$	3,992	$	4,173
Operating cash flows from finance leases	267		—		—
Financing cash flows from finance leases	141		—		—

Right of use assets obtained in exchange for operating lease liabilities1	25,590		1,579		231
Right of use assets obtained in exchange for finance lease liabilities1	6,365		—		—

___________________________________________

Future undiscounted payments for leases with initial terms of one year or more are presented in the table below:


	As of December 31, 2025
(dollars in thousands)	Operating Leases		Finance Leases
Rent commitments

2026	$	6,255	$	490
2027	5,929		527
2028	5,406		540
2029	4,407		540
2030	3,505		540
Thereafter	12,690		6,625
Total undiscounted cash flows	38,192		9,262
Less: Amounts representing interest	5,595		3,039
Present value of net future minimum lease payments	$	32,597	$	6,223

As of December 31, 2025, Busey had commitments totaling $6.0 million for three lease contracts with future accounting commencement dates.

Busey as The Lessor


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Rental income	$	860	$	820	$	724


(dollars in thousands)	As of December 31, 2025
Rents to be received

2026	$	804
2027	515
2028	377
2029	197
2030	117
Thereafter	—
Total lease payments from operating leases	$	2,010

For additional information about Busey’s accounting policies related to leases, see “Leases” in “Note 1. Significant Accounting Policies.”

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Financial Instruments Owned and Pledged as Collateral (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Cash pledged to secure obligations under derivative contracts
Derivative Financial Instruments
Cash pledged to secure obligations	$ 14,400	$ 21,900
Collateral held to secure obligations under derivative contracts
Derivative Financial Instruments
Cash pledged to secure obligations	$ 5,050	$ 20,260

- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References + Details

DEBT SECURITIES - Schedule of Additional Information About Debt Securities Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2025 USD ($) security	Dec. 31, 2024 USD ($) security
Available for Sale
Debt securities with gross unrealized or unrecognized losses, fair value \| $	$ 1,131,224	$ 1,466,743
Gross unrealized or unrecognized losses on debt securities \| $	$ 152,182	$ 230,325
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	13.50%	15.70%
Count of debt securities \| security	637	677
Count of debt securities in an unrealized or unrecognized loss position \| security	376	586
Held to Maturity
Debt securities with gross unrealized or unrecognized losses, fair value \| $	$ 625,957	$ 675,053
Gross unrealized or unrecognized losses on debt securities \| $	$ 120,428	$ 151,577
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	19.20%	22.50%
Count of debt securities \| security	52	55
Count of debt securities in an unrealized or unrecognized loss position \| security	52	55
Total
Debt securities with gross unrealized or unrecognized losses, fair value \| $	$ 1,757,181	$ 2,141,796
Gross unrealized or unrecognized losses on debt securities \| $	$ 272,610	$ 381,902
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses	15.50%	17.80%
Count of debt securities \| security	689	732
Count of debt securities in an unrealized or unrecognized loss position \| security	428	641

STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation
Total stock-based compensation expense	$ 17,120	$ 7,726	$ 6,595
SSARs
Share-based Compensation
Total stock-based compensation expense	137	0	0
RSU awards
Share-based Compensation
Total stock-based compensation expense	10,657	3,823	2,622
PSU awards
Share-based Compensation
Total stock-based compensation expense	5,158	2,867	2,962
DSU awards
Share-based Compensation
Total stock-based compensation expense	842	826	833
ESPP
Share-based Compensation
Total stock-based compensation expense	$ 326	$ 210	$ 178

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Amortization Expense Relating to Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill and other intangibles assets
Amortization of intangible assets	$ 16,614	$ 10,057	$ 10,432
Core deposit intangible
Goodwill and other intangibles assets
Amortization of intangible assets	14,727	7,739	7,616
Customer relationship intangible
Goodwill and other intangibles assets
Amortization of intangible assets	$ 1,887	$ 2,318	$ 2,816

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

+ References

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- Definition

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+ Details

PREMISES AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2025

Property, Plant and Equipment [Abstract]

Schedule of Premises and Equipment and Depreciation Expenses

Premises and equipment are summarized in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Premises and equipment
Land and improvements	$	50,147	$	42,565
Buildings and improvements	194,925		130,185
Furniture and equipment	64,108		53,945
Premises and equipment, gross	309,180		226,695
Accumulated depreciation and amortization	(115,736)		(107,875)
Premises and equipment, net	$	193,444	$	118,820

Depreciation expense is presented in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Depreciation and amortization expense	$	12,926	$	9,503	$	9,488

BORROWINGS - Schedule of Long-Term Borrowings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) note	Dec. 31, 2024 USD ($)
Long-term debt
Finance lease liabilities	$ 6,223	$ 0
Total long-term borrowings	$ 113,806	$ 0
Weighted average rate for securities sold under agreements to repurchase	2.22%	2.63%
FHLB borrowings
Long-term debt
Total long-term borrowings	$ 102,792	$ 0
Number of notes \| note	15
Weighted average rate for securities sold under agreements to repurchase	2.43%
Debt, weighted average maturity period	1 year 11 months 15 days
Secured borrowings
Long-term debt
Total long-term borrowings	$ 4,791	$ 0
Number of notes \| note	7
Debt, weighted average maturity period	17 years 3 days

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

SIGNIFICANT ACCOUNTING POLICIES - Off Balance Sheet Arrangements (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Standby letters of credit
Obligation with Joint and Several Liability Arrangement [Line Items]
Off-balance sheet credit exposure	$ 13.0	$ 6.0

STOCK-BASED COMPENSATION - Stock Settled Appreciation Rights (Details) - SSARs - USD ($) $ in Millions		12 Months Ended
	Mar. 01, 2025	Dec. 31, 2025
Share-based Compensation
Fair value of SSARs that have vested		$ 3.7
CrossFirst \| Common \| CrossFirst
Share-based Compensation
Shares received for each share owned (in shares)	0.6675
Omnibus Incentive 2018 Plan
Share-based Compensation
Vesting period		7 years
Weighted average remaining contractual term		5 years 4 months 24 days
Period over which cost will be recognized		3 years 2 months 12 days
Omnibus Incentive 2018 Plan \| Minimum
Share-based Compensation
Share-based compensation, expiration period		10 years
Omnibus Incentive 2018 Plan \| Maximum
Share-based Compensation
Share-based compensation, expiration period		15 years

LEASES - Narrative (Details) $ in Millions	Dec. 31, 2025 USD ($) lease
Leases [Abstract]
Leases not yet commenced commitments \| $	$ 6.0
Number of leases not yet commenced \| lease	3

BORROWINGS - Short-Term Borrowings (Details) - USD ($)	12 Months Ended
BORROWINGS - Short-Term Borrowings (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Short-Term Debt [Line Items]
Short-term debt	$ 0	$ 0
Minimum
Short-Term Debt [Line Items]
Short-term borrowings, mature period	1 day
Maximum
Short-Term Debt [Line Items]
Short-term borrowings, mature period	90 days

INCOME TAXES - Schedule of the Components of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current expense:
Federal	$ 33,596	$ 26,696	$ 20,139
State	9,708	11,533	14,120
Deferred expense:
Federal	(579)	1,561	(1,557)
State	8,653	(177)	(1,363)
Income taxes	$ 51,378	$ 39,613	$ 31,339

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details

BORROWINGS

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

BORROWINGS

NOTE 10. BORROWINGS

Securities Sold Under Agreements to Repurchase

Securities sold under agreements to repurchase, which are classified as secured borrowings, generally mature daily. Securities sold under agreements to repurchase are reflected at the amount of cash received in connection with the transaction. The underlying securities are held by Busey’s safekeeping agent. Busey may be required to provide additional collateral based on fluctuations in the fair value of the underlying securities.

Securities sold under agreements to repurchase were as follows:


	As of December 31,
(dollars in thousands)	2025			2024
Securities sold under agreements to repurchase	$	166,929		$	155,610
Weighted average rate for securities sold under agreements to repurchase	2.22		%	2.63		%

Revolving Line of Credit

On May 28, 2021, Busey entered into a Second Amended and Restated Credit Agreement, pursuant to which it has access to a $40.0 million revolving line of credit bearing an interest rate of 1.80% plus the one-month forward-looking term rate based on SOFR. After executing subsequent amendments, the current termination date for the revolving line of credit is April 30, 2026. As of December 31, 2025, there was no balance outstanding on the revolving line of credit. The revolving line of credit incurs an insignificant non-usage fee based on any undrawn amounts.

Short-Term Borrowings

Busey had no short term borrowings as of either December 31, 2025, or December 31, 2024. When applicable, Busey’s short-term borrowings include loans maturing within one year of the loan origination date, the current portion of long-term debt that is due within 12 months, and federal funds purchased. Federal funds purchased are short-term borrowings that generally mature between one day and 90 days. During the second quarter of 2025, Busey purchased federal funds to test operational availability to access funds if needed.

Long-Term Borrowings

Busey’s long-term borrowings consists of loans maturing more than one year from the loan origination date, excluding the current portion that is due within 12 months, and finance lease liabilities. Long-term borrowings are summarized in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Long-term borrowings
FHLB borrowings	$	102,792	$	—
Secured borrowings	4,791		—

Finance lease liabilities	6,223		—
Total long-term borrowings	$	113,806	$	—

Funds borrowed from the FHLB, listed above, consisted of 15 notes with a weighted average interest rate of 2.43% and a weighted average maturity period of 1.96 years as of December 31, 2025. Maturity dates for the long-term FHLB borrowings range from May 2027 through October 2028.

Acquired SBA loans that did not qualify for sale accounting treatment are presented as secured borrowings. Secured borrowings consisted of seven notes with a weighted average maturity period of 17.01 years as of December 31, 2025. Maturity dates for the secured borrowings range from September 2030 to January 2046.

Subordinated Notes

On June 1, 2020, Busey issued $125.0 million of fixed-to-floating rate subordinated notes that mature on June 1, 2030. The subordinated notes, which qualified as Tier 2 capital for regulatory purposes, bore interest at an annual rate of 5.25% for the first five years after issuance. Thereafter, the notes were to bear interest at a floating rate equal to a three-month benchmark rate plus a spread of 5.11%, as calculated on each applicable determination date. The subordinated notes, which were unsecured obligations of the Company, had an optional redemption, in whole or in part, on any interest payment date on or after June 1, 2025. On June 1, 2025, Busey redeemed the entire $125.0 million outstanding principal amount of the subordinated notes.

On June 2, 2022, Busey issued $100.0 million aggregate principal amount of 5.000% fixed-to-floating rate subordinated notes maturing June 15, 2032, which qualify as Tier 2 Capital for regulatory purposes. The price to the public for the subordinated notes was 100% of the principal amount of the subordinated notes. Interest on the subordinated notes accrues at a rate equal to (1) 5.000% per annum from the original issue date to, but excluding, June 15, 2027, payable semiannually in arrears, and (2) a floating rate per annum equal to a benchmark rate, which is the Three-Month Term SOFR (as defined in the subordinated notes), plus a spread of 252 bps from and including June 15, 2027, payable quarterly in arrears. The subordinated notes have an optional redemption in whole or in part on any interest payment date on or after June 15, 2027.

Associated with the M&M acquisition completed on April 1, 2024 (see “Note 2. Business Combinations”), Busey acquired a $4.0 million 5.25% fixed-to-floating rate subordinated note maturing December 4, 2030, which qualified as Tier 2 capital for regulatory purposes. Interest on the subordinated note accrued at a rate equal to 5.25% per annum from the original issue date to December 4, 2025. Thereafter, the note was to accrue interest at a floating rate per annum equal to a benchmark rate, which was the Three-Month Term SOFR (as defined in the subordinated notes), plus a spread of 497 bps. The subordinated note had an optional redemption, in whole or in part, on or after December 4, 2025. On December 4, 2025, Busey redeemed the entire $4.0 million outstanding principal amount of the subordinated note.

Unamortized debt issuance costs related to Busey’s subordinated notes are presented in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Unamortized debt issuance costs
Subordinated notes issued in 2020	$	—	$	222
Subordinated notes issued in 2022	605		1,004
Total unamortized debt issuance costs	$	605	$	1,226

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-Name Accounting Standards Codification
-Section S50
-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/470/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1C

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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Reference 21: http://www.xbrl.org/2003/role/disclosureRef
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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
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Reference 23: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

EMPLOYEE BENEFIT PLANS

12 Months Ended

Dec. 31, 2025

Employee Benefit Plans

EMPLOYEE BENEFIT PLANS

NOTE 15. EMPLOYEE BENEFIT PLANS

401(k) Plan

Busey provides retirement benefits under its 401(k) Plan. All Busey associates who meet certain age requirements are eligible to participate in the 401(k) Plan. There is no waiting period for participation in the 401(k) Plan. The 401(k) Plan is funded primarily through participant contributions via payroll deductions, with two contribution options: (1) the traditional option allows plan participants to elect pre-tax contributions, and (2) the Roth option allows plan participants to elect after-tax contributions. Plan participants may elect to make traditional and/or Roth 401(k) contributions, up to the annual deferral and catch-up limits established by the Internal Revenue Service.

Busey supplements participant contributions by making safe harbor matching and discretionary profit-sharing contributions to the 401(k) Plan.

Safe Harbor Match

Busey makes safe harbor matching contributions to the 401(k) Plan equal to 100% of the first 3% of eligible participant compensation contributed to the plan and 50% of the next 2% of eligible participant compensation contributed to the plan. The rights of participants in safe harbor matching contributions vest immediately.

Profit Sharing

All associates who meet certain age and service requirements are eligible to participate in Busey's profit-sharing contributions. Discretionary profit-sharing contributions and related expenses, if any, are approved solely by the First Busey Corporation board of directors, and in no case may annual contributions be greater than the amounts deductible for federal income tax purposes for that year. The rights of participants in profit-sharing contributions vest ratably over a five-year period.

401(k) Plan Expenses

Expenses related to Busey’s employee benefit plans, reported in salaries, wages, and employee benefits in the accompanying Consolidated Statements of Income, are summarized in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
401(k) Plan expenses
Safe harbor match expenses	$	6,261	$	4,486	$	3,745
Profit-sharing expenses	4,914		3,370		3,031
Total 401(k) Plan expenses	$	11,175	$	7,856	$	6,776

TRANSACTIONS WITH RELATED PARTIES

12 Months Ended

Dec. 31, 2025

TRANSACTIONS WITH RELATED PARTIES

NOTE 17. TRANSACTIONS WITH RELATED PARTIES

Busey has had, and may be expected to have in the future, banking transactions in the ordinary course of business with related parties which include directors, executive officers, chief credit officers, their immediate families, and affiliated companies in which they have 10% or more beneficial ownership, on the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with others.

The following table presents changes in loans to related parties, as a group:


(dollars in thousands)	As of and for the Year Ended December 31, 2025
Balance of loans to related parties, December 31, 2024	$	98,011
Change in relationship	(62,108)
New loans/advances	2,383
Repayments	(3,373)
Balance of loans to related parties, December 31, 2025	$	34,913

Unused commitments to directors and executive officers	$	35,863

Loans to related parties did not include significant amounts that were past due, non-accrual, or modified.

Deposits from related parties totaled $98.0 million as of December 31, 2025, and $31.2 million as of December 31, 2024.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480990/946-20-50-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480990/946-20-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
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-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/850/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-6

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

+ Details

PARENT COMPANY ONLY FINANCIAL INFORMATION - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Equity securities	$ 14,916	$ 15,862
Investments in subsidiaries:
Other assets	475,726	359,198
Total assets	18,104,736	12,046,722
Liabilities:
Subordinated notes, net of unamortized issuance costs	99,395	227,723
Junior subordinated debentures owed to unconsolidated trusts	77,328	74,815
Other liabilities	272,338	222,815
Total liabilities	15,635,754	10,663,453
Total stockholders’ equity	2,468,982	1,383,269	$ 1,271,981	$ 1,145,977
Total liabilities and stockholders’ equity	18,104,736	12,046,722
Parent Company
Assets
Cash and cash equivalents	126,764	73,484
Equity securities	14,761	10,295
Investments in subsidiaries:
Bank	2,483,450	1,584,264
Premises and equipment, net	1,590	11
Other assets	41,614	29,859
Total assets	2,668,179	1,697,913
Liabilities:
Subordinated notes, net of unamortized issuance costs	99,395	227,723
Junior subordinated debentures owed to unconsolidated trusts	77,328	74,815
Other liabilities	22,474	12,106
Total liabilities	199,197	314,644
Total stockholders’ equity	2,468,982	1,383,269
Total liabilities and stockholders’ equity	$ 2,668,179	$ 1,697,913

TAX CREDIT INVESTMENTS AND OTHER INVESTMENTS IN UNCONSOLIDATED ENTITIES (Tables)

12 Months Ended

Dec. 31, 2025

Investments, All Other Investments [Abstract]

Schedule of Investments

Busey’s investments in unconsolidated entities and related unfunded investment obligations are reflected in other assets and other liabilities on the Consolidated Balance Sheets, and are summarized in the table below:


		As of December 31,
(dollars in thousands)	Location	2025		2024
Investments in unconsolidated entities
Tax credit investments	Other assets	$	119,634	$	104,635
Other investments in unconsolidated entities	Other assets	46,361		27,371
Investments in unconsolidated entities		$	165,995	$	132,006

Unfunded investment obligations	Other liabilities	$	68,690	$	61,210

Actual amounts of income tax credits and other benefits, along with investment amortization, are presented in the table below.


	Years Ended December 31,
(dollars in thousands)	2025		2024
Income tax credits and other tax benefits	$	17,676	$	20,734
Amortization of investments in tax-advantaged projects	15,735		18,494

SIGNIFICANT ACCOUNTING POLICIES - Leases (Details)	Dec. 31, 2025 lease
Accounting Policies [Abstract]
Number of finance leases	1

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Net Gains (Losses) Relating to Derivative Instruments (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Financial Instruments
Net gains (losses) on mortgage banking derivatives	$ 749	$ 438	$ 2
Interest rate lock commitments
Derivative Financial Instruments
Derivative, gain (loss), statement of income or comprehensive income [Extensible Enumeration]	Mortgage revenue	Mortgage revenue	Mortgage revenue
Net gains (losses) on mortgage banking derivatives	$ 789	$ 585	$ 0
Forward sales commitments
Derivative Financial Instruments
Derivative, gain (loss), statement of income or comprehensive income [Extensible Enumeration]	Mortgage revenue	Mortgage revenue	Mortgage revenue
Net gains (losses) on mortgage banking derivatives	$ (40)	$ (147)	$ 2

SIGNIFICANT ACCOUNTING POLICIES - Loan Servicing (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Unpaid principal balances of loans serviced			$ 667.9	$ 582.5
Mortgage servicing rights sold		$ 923.5
Pre-tax gain on debt securities		7.5
Debt securities, available for sale, sold	$ 205.6	108.2
Pre-tax loss on sale of debt securities available for sale	$ 15.5	$ 6.8
Impairment charges			$ 0.2	$ 0.0

- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481260/860-50-45-2

+ Details

SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details)	Dec. 31, 2025 USD ($)
Accounting Policies [Abstract]
Accruals for payments of interest and penalties	$ 0

DEPOSITS - Schedule of Composition of Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deposits [Abstract]
Noninterest-bearing demand deposits	$ 3,659,421	$ 2,719,907
Interest-bearing transaction deposits	3,119,475	2,423,237
Saving deposits and money market deposits	5,697,172	3,348,711
Time deposits	2,429,890	1,490,635
Total deposits	14,905,958	9,982,490
Brokered interest-bearing transaction deposits	50,136	0
Brokered savings deposits and money market deposits	10,000	6,002
Brokered time deposits	10,004	7,088
Total time deposits with a minimum denomination of $100,000	1,674,862	860,193
Total time deposits with a minimum denomination that meets or exceeds the FDIC insurance limit of $250,000	$ 876,207	$ 334,503

LEASES - Schedule of Future Undiscounted Lease Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Operating Leases
2026	$ 6,255
2027	5,929
2028	5,406
2029	4,407
2030	3,505
Thereafter	12,690
Total undiscounted cash flows	38,192
Less: Amounts representing interest	5,595
Present value of net future minimum lease payments	32,597	$ 11,040
Finance Leases
2026	490
2027	527
2028	540
2029	540
2030	540
Thereafter	6,625
Total undiscounted cash flows	9,262
Less: Amounts representing interest	3,039
Present value of net future minimum lease payments	$ 6,223	$ 0

OPERATING SEGMENTS AND RELATED INFORMATION (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Schedule of Information Relating to Operating Segments

Goodwill and total assets are summarized below by operating segment. The “other” category included in the tables below consists of the parent company, First Busey Risk Management, Inc. until its dissolution on December 18, 2023, and the elimination of intercompany transactions:


	As of December 31, 2025
(dollars in thousands)	Banking		Wealth Management		FirsTech		Other		Total
Goodwill	$	360,180	$	14,108	$	8,992	$	—	$	383,280
Total assets	17,880,797		152,422		45,373		26,144		18,104,736


	As of December 31, 2024
(dollars in thousands)	Banking		Wealth Management		FirsTech		Other		Total
Goodwill	$	310,595	$	14,108	$	8,992	$	—	$	333,695
Total assets	11,856,651		126,180		57,737		6,154		12,046,722

Financial results by operating segment, including significant expense categories provided to the chief operating decision maker, are summarized below:


	Year Ended December 31, 2025
(dollars in thousands)	Banking		Wealth Management		FirsTech		Other		Total
Interest income	$	893,854	$	—	$	—	$	6	$	893,860
Intersegment interest income	—		—		62		(62)		—
Interest expense	310,058		—		—		14,193		324,251
Intersegment interest expense	3,210		—		—		(3,210)		—
Net interest income	580,586		—		62		(11,039)		569,609
Provision for credit losses	52,743		—		—		—		52,743
Net interest income after provision for credit losses	527,843		—		62		(11,039)		516,866

Noninterest income
Wealth management fees	—		69,426		—		—		69,426
Payment technology solutions	—		—		20,000		—		20,000
Treasury management services	17,322		—		—		—		17,322
Card services and ATM fees	18,048		—		—		—		18,048
Other service charges on deposit accounts	6,281		—		—		—		6,281
All other noninterest income	11,701		754		(11)		6,454		18,898
Intersegment noninterest income	1,795		—		1,588		(3,383)		—
Noninterest income	55,147		70,180		21,577		3,071		149,975

Revenue	635,733		70,180		21,639		(7,968)		719,584

Noninterest expense
Salaries, wages, and employee benefits	206,640		28,870		10,589		42,964		289,063
Data processing	36,551		2,590		3,702		338		43,181
Amortization of intangible assets	15,735		879		—		—		16,614
Interchange expense	—		—		5,194		—		5,194
All other noninterest expense	104,371		2,691		2,818		16,269		126,149
Intersegment noninterest expense	18,427		3,330		1,534		(23,291)		—
Noninterest expense	381,724		38,360		23,837		36,280		480,201

Income (loss) before income taxes	201,266		31,820		(2,198)		(44,248)		186,640
Income taxes	50,924		7,637		(435)		(6,748)		51,378
Net income	$	150,342	$	24,183	$	(1,763)	$	(37,500)	$	135,262


	Year Ended December 31, 2024
	Banking		Wealth Management		FirsTech		Other		Total
Interest income	$	523,648	$	—	$	—	$	33	$	523,681
Intersegment interest income	324		—		48		(372)		—
Interest expense	183,126		—		—		17,944		201,070
Intersegment interest expense	2,664		—		—		(2,664)		—
Net interest income	338,182		—		48		(15,619)		322,611
Provision for credit losses	7,495		—		—		—		7,495
Net interest income after provision for credit losses	330,687		—		48		(15,619)		315,116

Noninterest income
Wealth management fees	—		63,630		—		—		63,630
Payment technology solutions	—		—		21,983		—		21,983
Treasury management services	8,377		—		—		—		8,377
Card services and ATM fees	13,424		—		—		—		13,424
Other service charges on deposit accounts	9,440		—		—		—		9,440
All other noninterest income	20,563		1,323		—		942		22,828
Intersegment noninterest income	1,402		—		1,071		(2,473)		—
Noninterest income	53,206		64,953		23,054		(1,531)		139,682

Revenue	391,388		64,953		23,102		(17,150)		462,293

Noninterest expense
Salaries, wages, and employee benefits	117,730		26,631		10,130		21,128		175,619
Data processing	20,631		2,263		3,692		538		27,124
Amortization of intangible assets	8,916		1,141		—		—		10,057
Interchange expense	—		—		6,001		—		6,001
All other noninterest expense	67,528		2,836		2,736		9,593		82,693
Intersegment noninterest expense	11,457		3,096		1,443		(15,996)		—
Noninterest expense	226,262		35,967		24,002		15,263		301,494

Income (loss) before income taxes	157,631		28,986		(900)		(32,413)		153,304
Income taxes	40,365		6,956		(230)		(7,478)		39,613
Net income	$	117,266	$	22,030	$	(670)	$	(24,935)	$	113,691


	Year Ended December 31, 2023
	Banking		Wealth Management		FirsTech		Other		Total
Interest income	$	480,438	$	—	$	—	$	105	$	480,543
Intersegment interest income	—		—		54		(54)		—
Interest expense	140,917		—		—		19,005		159,922
Intersegment interest expense	3,006		—		—		(3,006)		—
Net interest income	336,515		—		54		(15,948)		320,621
Provision for credit losses	2,860		—		—		—		2,860
Net interest income after provision for credit losses	333,655		—		54		(15,948)		317,761

Noninterest income
Wealth management fees	—		57,309		—		—		57,309
Payment technology solutions	—		—		21,192		—		21,192
Treasury management services	7,435		—		—		—		7,435
Card services and ATM fees	12,305		—		—		—		12,305
Other service charges on deposit accounts	10,134		—		—		—		10,134
All other noninterest income	14,507		514		—		(2,182)		12,839
Intersegment noninterest income	1,149		—		1,554		(2,703)		—
Noninterest income	45,530		57,823		22,746		(4,885)		121,214

Revenue	382,045		57,823		22,800		(20,833)		441,835

Noninterest expense
Salaries, wages, and employee benefits	111,834		24,474		8,522		17,767		162,597
Data processing	18,217		1,937		3,013		541		23,708
Amortization of intangible assets	8,963		1,469		—		—		10,432
Interchange expense	—		—		6,864		—		6,864
All other noninterest expense	70,798		2,503		2,154		6,015		81,470
Intersegment noninterest expense	13,178		2,698		1,100		(16,976)		—
Noninterest expense	222,990		33,081		21,653		7,347		285,071

Income (loss) before income taxes	156,195		24,742		1,147		(28,180)		153,904
Income taxes	32,342		5,938		317		(7,258)		31,339
Net income	$	123,853	$	18,804	$	830	$	(20,922)	$	122,565

BUSINESS COMBINATIONS (Tables)

12 Months Ended

Dec. 31, 2025

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Schedule of Estimated Acquisition-Date Fair Values of the Assets Acquired and Liabilities Assumed

Acquisition-date fair values of the assets acquired and liabilities assumed, as well as the fair value of consideration transferred, were estimated as follows:


	March 1, 2025		April 1, 2024
(dollars in thousands)	CrossFirst (provisional)		M&M (final)
Assets acquired
Cash and cash equivalents	$	385,808	$	33,577
Securities	725,622		8,086
Portfolio loans, net of ACL	6,023,063		417,230
Premises and equipment	69,673		2,045

Other intangible assets1	81,783		6,346
Other assets	212,440		10,461
Total assets acquired	7,498,389		477,745

Liabilities assumed
Deposits	6,571,699		392,838
Short-term borrowings	11,148		35,932
Long-term borrowings	68,922		1,450
Subordinated notes, net of unamortized issuance costs	—		3,911
Junior subordinated debt owed to unconsolidated trusts	2,238		2,594

Other liabilities	84,912		7,342
Total liabilities assumed	6,738,919		444,067

Net assets acquired	$	759,470	$	33,678

Consideration paid
Cash	$	4	$	15,200
Common stock	795,227		34,375
Preferred stock	7,750		—
Replacement awards	5,999		—
Total consideration paid	$	808,980	$	49,575

Goodwill	$	49,510	$	15,897

___________________________________________

1.Other intangible assets are being amortized over a period of ten years.

Schedule of Reconciliation Between the Purchase Price and the Fair Value

The following table provides a reconciliation between the purchase price and the fair value of these financial assets:


	March 1, 2025		April 1, 2024
(dollars in thousands)	CrossFirst		M&M
PCD Financial Assets
Gross contractual receivable for PCD financial assets	$	1,539,718	$	29,290
ACL recorded for estimated uncollectible contractual cash flows specific to PCD financial assets	(100,783)		(1,243)
Interest premium (discount) specific to PCD financial assets	(3,063)		(1,773)
Loans previously charged-off prior to acquisition	(110,740)		—
Fair value of PCD financial assets	$	1,325,132	$	26,274

Busey incurred acquisition related expenses as follows:


	Years Ended December 31,
(dollars in thousands)	2025		2024
Pre-tax acquisition expenses
M&M	$	108	$	3,038
CrossFirst1	100,200		3,863
Pre-tax acquisition expenses	$	100,308	$	6,901

___________________________________________

Of the total acquisition related expenses, the following legal, professional, and consulting costs were incurred to consummate the mergers:


	Years Ended December 31,
(dollars in thousands)	2025		2024
Pre-tax costs to consummate the merger
M&M	$	—	$	147
CrossFirst	7,533		3,125
Pre-tax costs to consummate the merger	$	7,533	$	3,272

Schedule of Pro Forma Information

Only the merger related expenses that have been recognized are included in net income in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024
Revenue (net interest income plus noninterest income)	$	758,049	$	750,667
Net income	182,837		170,894
Diluted earnings per common share	1.91		1.87

- Definition

Tabular disclosure of business combination. Includes, but is not limited to, recognized asset and liability.

+ References + Details

SIGNIFICANT ACCOUNTING POLICIES - Schedule of Estimated Useful Lives for Premises and Equipment (Details)	Dec. 31, 2025
Minimum \| Buildings and improvements
Premises and equipment
Estimated Useful Life	3 years
Minimum \| Furniture and equipment
Premises and equipment
Estimated Useful Life	3 years
Maximum \| Buildings and improvements
Premises and equipment
Estimated Useful Life	40 years
Maximum \| Furniture and equipment
Premises and equipment
Estimated Useful Life	10 years

INCOME TAXES - Schedule of the Reconciliation of Federal and State Income Taxes at Statutory rates to the Income Taxes Included in the Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income taxes at federal statutory rate	$ 39,194	$ 32,194	$ 32,320
State and local income taxes (net of federal income tax effect)	14,470	10,890	10,072
Low income housing tax credits	(7,954)	(5,657)	(11,243)
New markets tax credits	(9,008)	(9,474)	(2,416)
Other credits	(1,589)	(883)	(1,306)
Tax-exempt interest, net	(2,148)	(1,141)	(1,493)
Compensation	3,079	407	(217)
Other nontaxable or nondeductible	546
Other nontaxable or nondeductible		(381)	(793)
Investment in partnerships	14,692	13,244	5,714
Other	96	414	701
Income taxes	$ 51,378	$ 39,613	$ 31,339
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income taxes at federal statutory rate	21.00%	21.00%	21.00%
State and local income taxes (net of federal income tax effect)	7.80%	7.10%	6.50%
Low income housing tax credits	(4.30%)	(3.70%)	(7.30%)
New markets tax credits	(4.80%)	(6.20%)	(1.60%)
Other credits	(0.90%)	(0.60%)	(0.80%)
Tax-exempt interest, net	(1.20%)	(0.70%)	(1.00%)
Compensation	1.70%	0.30%	(0.10%)
Other nontaxable or nondeductible	0.20%
Other nontaxable or nondeductible		(0.30%)	(0.50%)
Investment in partnerships	7.90%	8.60%	3.70%
Other	0.10%	0.30%	0.50%
Effective income tax rate	27.50%	25.80%	20.40%

TRANSACTIONS WITH RELATED PARTIES - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Related Party Transactions [Abstract]
Deposits from related parties	$ 98.0	$ 31.2

DEBT SECURITIES - Schedule of Maturity of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 10,725
Due after one year through five years	66,180
Due after five years through ten years	371,411
Due after ten years	1,852,529
Amortized Cost	2,300,845	$ 2,039,952
Fair Value
Due in one year or less	10,684
Due after one year through five years	63,335
Due after five years through ten years	355,748
Due after ten years	1,732,781
Fair Value	2,162,548	1,810,221
Amortized Cost
Due in one year or less	20,000
Due after one year through five years	37,076
Due after ten years	689,309
Amortized Cost	746,385	826,630
Fair Value
Due in one year or less	19,896
Due after one year through five years	35,836
Due after ten years	570,225
Fair Value	$ 625,957	$ 675,053

STOCK-BASED COMPENSATION - RSU, PSU, and DSU Narrative (Details) - USD ($) $ in Millions							12 Months Ended
	Mar. 26, 2026	Oct. 08, 2025	Jul. 23, 2025	May 29, 2025	Mar. 26, 2025	Mar. 01, 2025	Dec. 31, 2025
RSU awards
Share-based Compensation
Number of shares of common stock per award (in shares)							1
Granted (in shares)							387,882
RSU awards \| Maximum
Share-based Compensation
Requisite service periods							5 years
RSU awards \| Minimum
Share-based Compensation
Requisite service periods							1 year
PSU awards
Share-based Compensation
Number of shares of common stock per award (in shares)							1
Granted (in shares)							407,723
Market Based Performance Stock Units \| 2020 Equity Plan
Share-based Compensation
Granted (in shares)						59,471
Grant date fair value of the award						$ 1.3
Market Based Performance Stock Units \| 2020 Equity Plan \| Maximum
Share-based Compensation
Granted (in shares)						95,154
Vesting percentage (as a percent)						160.00%
Market Based Performance Stock Units \| 2020 Equity Plan \| Minimum
Share-based Compensation
Vesting percentage (as a percent)						0.00%
DSU awards
Share-based Compensation
Number of shares of common stock per award (in shares)							1
Granted (in shares)							39,846
Vesting period							1 year
Settlement period							30 days
Management \| RSU awards
Share-based Compensation
Number of shares of common stock per award (in shares)							1
Management \| RSU awards \| 2020 Equity Plan
Share-based Compensation
Granted (in shares)		21,395	13,724	4,494	348,269
Grant date fair value of the award		$ 0.5	$ 0.3	$ 0.1	$ 7.7
Management \| RSU awards \| 2020 Equity Plan \| Maximum
Share-based Compensation
Period over which cost will be recognized					3 years
Management \| RSU awards \| 2020 Equity Plan \| Minimum
Share-based Compensation
Period over which cost will be recognized				3 years
Requisite service periods					1 year
Management \| PSU awards
Share-based Compensation
Number of shares of common stock per award (in shares)							1
Management \| Market Based Performance Stock Units \| 2020 Equity Plan
Share-based Compensation
Granted (in shares)					174,126
Grant date fair value of the award					$ 3.4
Management \| Market Based Performance Stock Units \| 2020 Equity Plan \| Maximum
Share-based Compensation
Granted (in shares)					278,602
Vesting percentage (as a percent)					160.00%
Management \| Market Based Performance Stock Units \| 2020 Equity Plan \| Minimum
Share-based Compensation
Vesting percentage (as a percent)					0.00%
Management \| Performance Based Performance Stock Units \| 2020 Equity Plan
Share-based Compensation
Granted (in shares)					174,126
Grant date fair value of the award					$ 3.9
Management \| Performance Based Performance Stock Units \| 2020 Equity Plan \| Maximum
Share-based Compensation
Granted (in shares)					278,602
Vesting percentage (as a percent)					160.00%
Management \| Performance Based Performance Stock Units \| 2020 Equity Plan \| Minimum
Share-based Compensation
Vesting percentage (as a percent)					0.00%
Nonemployee Directors \| DSU awards
Share-based Compensation
Number of shares of common stock per award (in shares)							1
Vesting period							1 year
Nonemployee Directors \| DSU awards \| 2020 Equity Plan
Share-based Compensation
Granted (in shares)					39,846
Grant date fair value of the award					$ 0.9
Period over which cost will be recognized					1 year
Nonemployee Directors \| DSU awards \| 2020 Equity Plan \| Forecast
Share-based Compensation
Vesting percentage (as a percent)	100.00%

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2025
Audit Information [Abstract]
Auditor Firm ID	49
Auditor Name	RSM US LLP
Auditor Location	Des Moines, Iowa

FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

NOTE 20. FAIR VALUE MEASUREMENTS

The fair value of an asset or liability is the price that would be received by selling that asset or paid in transferring that liability (exit price) in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. ASC Topic 820 “Fair Value Measurement” establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:

•Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

•Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatility, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means.

•Level 3 Inputs – Unobservable inputs for determining the fair values of assets or liabilities that reflect the Company’s own assumptions about the assumptions that market participants would use in pricing the assets or liabilities.

A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. These valuation methodologies were applied to Busey’s assets and liabilities that are carried at fair value.

In general, fair value estimates are based upon quoted market prices, when available. If such quoted market prices are not available, fair values are estimated utilizing independent valuation techniques that consider identical or similar securities for which significant assumptions are derived primarily from or corroborated by observable data. Valuation adjustments may be made to ensure that financial instruments are recorded at their estimated fair values. These adjustments may include amounts to reflect, among other things, counterparty credit quality and the company's creditworthiness as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. While management believes Busey's valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to estimate the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.

Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

Debt Securities Available for Sale

Debt securities classified as available for sale are reported at fair value, which is estimated using Level 2 inputs. Busey obtains fair value measurements from an independent pricing service. The independent pricing service utilizes evaluated pricing models that vary by asset class and incorporate available trade, bid, and other market information. Because many fixed income securities do not trade on a daily basis, the independent pricing service applies available information to prepare evaluations, with a focus on observable market data such as benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing.

The independent pricing service uses model processes, such as the Option Adjusted Spread model, to assess interest rate impact and develop prepayment scenarios. Models and processes take into account market conventions. For each asset class, a team of evaluators gathers information from market sources and integrates relevant credit information, perceived market movements, and sector news into the evaluated pricing applications and models.

Market inputs that the independent pricing service normally seeks for evaluations of securities, listed in approximate order of priority, include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including market research publications. The independent pricing service also monitors market indicators, industry, and economic events. For certain security types, additional inputs may be used or some of the market inputs may not be applicable. Evaluators may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs listed are available for use in the evaluation process for each security evaluation on a given day. Because the data utilized was observable, the securities have been classified as Level 2.

Equity Securities

Equity securities are reported at fair value, which is estimated using Level 1 or Level 2 inputs. Fair value measurements of mutual funds or stock in active markets are estimated using unadjusted quoted prices for identical assets at the measurement date and are classified as Level 1. Fair value measurements of stock that are not active use quoted prices for identical or similar assets in markets and are classified as Level 2.

Derivative Assets and Derivative Liabilities

Busey’s derivative assets and derivative liabilities are reported at fair value, which is measured using Level 2 or Level 3 inputs. Derivative balances are included in other assets or other liabilities on the Consolidated Balance Sheets, and consist of interest rate swaps and risk participation agreements where there is no significant deterioration in the counterparties (loan customers) credit risk since origination of the interest rate swap or risk participation agreement, as well as mortgage banking derivatives, including interest rate lock commitments and forward sales commitments.

Fair values of derivative assets and liabilities are estimated based on prices that are obtained from a third-party which uses observable market inputs and, with the exception of risk participation agreements, are classified as Level 2. For purposes of potential valuation adjustments to Busey’s derivative positions, Busey evaluates the credit risk of its counterparties as well as its own credit risk. Accordingly, Busey has considered factors such as the likelihood of default, expected loss given default, net exposures, and remaining contractual life, among other things, in determining if any estimated fair value adjustments related to credit risk are required. Busey reviews counterparty exposure quarterly, and when necessary, appropriate adjustments are made to reflect the exposure. No changes in counterparty credit were identified.

Due to the significance of unobservable inputs, derivative assets related to risk participation agreements are classified as Level 3.

The following tables summarize financial assets and financial liabilities measured at estimated fair value on a recurring basis:


	As of December 31, 2025
(dollars in thousands)	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
Debt securities available for sale:

Obligations of U.S. government corporations and agencies	$	—	$	112,046	$	—	$	112,046
Obligations of states and political subdivisions	—		263,873		—		263,873
Asset-backed securities	—		265,580		—		265,580
Commercial mortgage-backed securities	—		132,942		—		132,942
Residential mortgage-backed securities	—		1,344,416		—		1,344,416
Corporate debt securities	—		43,691		—		43,691
Equity securities	155		14,761		—		14,916
Derivative assets	—		30,902		30		30,932
Derivative liabilities	—		42,155		65		42,220


	As of December 31, 2024
(dollars in thousands)	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
Debt securities available for sale:

Obligations of U.S. government corporations and agencies	$	—	$	1,400	$	—	$	1,400
Obligations of states and political subdivisions	—		139,829		—		139,829
Asset-backed securities	—		336,557		—		336,557
Commercial mortgage-backed securities	—		92,174		—		92,174
Residential mortgage-backed securities	—		1,087,210		—		1,087,210
Corporate debt securities	—		153,051		—		153,051
Equity securities	5,567		10,295		—		15,862
Derivative assets	—		30,368		5		30,373
Derivative liabilities	—		58,099		—		58,099

Activity for risk participation agreements, which are financial assets measured at estimated fair value on a recurring basis using Level 3, is summarized in the tables below:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024
Beginning Balance		$	5	$	15
Gains (losses) recognized in earnings	Other expense	117		(26)

Purchases		(171)		16
Sales		55		—
Assumed in acquisition		(41)		—




Ending Balance		$	(35)	$	5

For additional information about Busey’s accounting policies related to the fair value of financial instruments, see “Fair Value of Financial Instruments” in “Note 1. Significant Accounting Policies.”

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Certain financial assets and financial liabilities are measured at estimated fair value on a non-recurring basis; that is, the instruments are not measured at estimated fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment).

Loans Evaluated Individually

Busey does not record portfolio loans at estimated fair value on a recurring basis. However, periodically, a loan is evaluated individually and is reported at the estimated fair value of the underlying collateral, less estimated costs to sell, if repayment is expected solely from the collateral. If the estimated collateral value is not sufficient, a specific reserve is recorded. Collateral values are estimated using a combination of observable inputs, including recent appraisals, and unobservable inputs based on customized discounting criteria. Due to the significance of unobservable inputs, fair values of individually evaluated collateral dependent loans have been classified as Level 3.

OREO and Other Repossessed Assets

Non-financial assets measured at fair value, upon initial recognition or subsequent impairment, include OREO and other repossessed assets. OREO properties and other repossessed assets are measured using a combination of observable inputs, including recent appraisals, and unobservable inputs. Due to the significance of unobservable inputs, the estimated fair values of all OREO and other repossessed assets have been classified as Level 3.

Bank Property Held for Sale

Bank property held for sale represents certain banking center office buildings which Busey has closed and consolidated with other existing banking centers. Bank property held for sale is measured at the lower of amortized cost or estimated fair value less estimated costs to sell, and is included in premises and equipment, net on the Consolidated Balance Sheets. Fair values were based upon discounted appraisals or real estate listing prices. Due to the significance of unobservable inputs, fair values of all bank property held for sale have been classified as Level 3.

The following tables summarize assets and liabilities measured at estimated fair value on a non-recurring basis:


	As of December 31, 2025
(dollars in thousands)	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
Loans evaluated individually, net of related allowance	$	—	$	—	$	19,604	$	19,604
OREO and other repossessed assets with subsequent impairment	—		—		4,409		4,409
Bank property held for sale with impairment	—		—		1,855		1,855


	As of December 31, 2024
(dollars in thousands)	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
Loans evaluated individually, net of related allowance	$	—	$	—	$	616	$	616

Bank property held for sale with impairment	—		—		2,841		2,841

The following tables present additional quantitative information about assets measured at estimated fair value on a non-recurring basis using Level 3 inputs:

As of December 31, 2025

(dollars in thousands)

Fair Value

Valuation
Techniques

Unobservable
Input

Range
(Weighted Average)

Loans evaluated individually, net of related allowance

19,604

Appraisal of collateral

Appraisal adjustments

-1.6% to -100.0%

(-44.6)

OREO and other repossessed assets with subsequent impairment

4,409

Appraisal of collateral

Appraisal adjustments

-2.8% to -24.1%

(-4.5)%

Bank property held for sale with impairment

1,855

Appraisal of collateral or real estate listing price

Appraisal adjustments

-9.0% to -58.0%

(-39.4)

As of December 31, 2024

(dollars in thousands)

Fair Value

Valuation
Techniques

Unobservable
Input

Range
(Weighted Average)

Loans evaluated individually, net of related allowance

616

Appraisal of collateral

Appraisal adjustments

-25.0% to -100.0%

(-74.9)%

Bank property held for sale with impairment

2,841

Appraisal of collateral or real estate listing price

Appraisal adjustments

-9.0% to -76.7%

(-51.8)%

Financial Assets and Financial Liabilities That Are Not Carried at Fair Value

Fair values of financial instruments that are not carried at fair value on Busey’s Consolidated Balance Sheets were estimated as follows:


	As of December 31, 2025				As of December 31, 2024
(dollars in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial assets
Level 1 inputs:
Cash and cash equivalents	$	294,052	$	294,052	$	697,659	$	697,659
Level 2 inputs:
Debt securities held to maturity	746,385		625,957		826,630		675,053
Loans held for sale	5,752		5,886		3,657		3,726
Restricted bank stock	77,006		77,006		49,930		49,930
Accrued interest receivable	71,788		71,788		45,141		45,141
Level 3 inputs:
Portfolio loans, net	13,393,776		13,472,907		7,613,683		7,426,158
Mortgage servicing rights	1,459		5,176		1,304		5,627
Other servicing rights	2,086		2,193		1,482		1,591

Financial liabilities
Level 2 inputs:
Time deposits	$	2,429,890	$	2,425,290	$	1,490,635	$	1,481,591
Securities sold under agreements to repurchase	166,929		166,929		155,610		155,610

Long-term borrowings	113,806		113,853		—		—
Junior subordinated debt owed to unconsolidated trusts	77,328		71,407		74,815		67,314
Accrued interest payable	25,372		25,372		21,129		21,129
Level 3 inputs:

Subordinated notes, net of unamortized issuance costs	99,395		94,500		227,723		219,043

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

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+ Details

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Interest Rate Swaps Not Designated as Hedges (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Interest Rate Swap
Derivative assets not designated as hedging instruments
Notional Amount	$ 1,160,259	$ 719,236
Fair Value	27,540	30,319
Derivative liabilities not designated as hedging instruments
Notional Amount	1,160,259	719,236
Fair Value	27,540	30,319
Interest rate swaps: receive-fixed, pay-floating
Derivative assets not designated as hedging instruments
Notional Amount	703,286	156,539
Fair Value	11,542	1,465
Derivative liabilities not designated as hedging instruments
Notional Amount	456,973	562,697
Fair Value	15,998	28,854
Interest rate swaps: receive-floating, pay-fixed
Derivative assets not designated as hedging instruments
Notional Amount	456,973	562,697
Fair Value	15,998	28,854
Derivative liabilities not designated as hedging instruments
Notional Amount	703,286	156,539
Fair Value	$ 11,542	$ 1,465

BORROWINGS - Schedule of Unamortized Debt Issuance Cost (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Junior subordinated debt owed to unconsolidated trusts
Total unamortized debt issuance costs	$ 605	$ 1,226
Subordinated notes issued in 2020 \| Subordinated Debt
Junior subordinated debt owed to unconsolidated trusts
Total unamortized debt issuance costs	0	222
Subordinated notes issued in 2022 \| Subordinated Debt
Junior subordinated debt owed to unconsolidated trusts
Total unamortized debt issuance costs	$ 605	$ 1,004

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

SIGNIFICANT ACCOUNTING POLICIES

NOTE 1. SIGNIFICANT ACCOUNTING POLICIES

Organization and Nature of Operations

First Busey Corporation is a financial holding company organized under the laws of Nevada. First Busey Corporation’s subsidiaries provide retail and commercial banking services and payment technology solutions, and offer a full range of financial products and services including depository, lending, security brokerage, investment management, and fiduciary services, to individual, corporate, institutional, and governmental customers through their locations in Illinois, Missouri, Texas, Colorado, Florida, Kansas, Oklahoma, Arizona, Indiana, and New Mexico. First Busey Corporation and its subsidiaries are subject to the regulations of certain regulatory agencies and undergo periodic examinations by those regulatory agencies.

Busey’s accounting and reporting policies conform to GAAP. The Consolidated Financial Statements include the accounts of First Busey Corporation and its subsidiaries, which include Deed of Trust Services Corporation, and Busey Bank, including Busey Bank’s wholly-owned subsidiaries Busey Capital Management, Inc., CrossFirst Investments, Inc., FirsTech, Inc., and Pulaski Service Corporation. Further, until its dissolution on December 18, 2023, First Busey Risk Management, Inc. was a subsidiary of First Busey Corporation and included in Busey’s Consolidated Financial Statements. Operating results generated from acquired businesses are included with Busey’s results of operations starting from each date of acquisition. First Busey Corporation and its subsidiaries maintain various limited liability companies that hold specific assets for risk mitigation purposes and are consolidated into Busey’s Consolidated Financial Statements. Intercompany balances and transactions have been eliminated in consolidation.

Because Busey is not the primary beneficiary, the Consolidated Financial Statements exclude the following wholly-owned variable interest entities: CrossFirst Holdings Statutory Trust I, First Busey Statutory Trust II, First Busey Statutory Trust III, First Busey Statutory Trust IV, Merchants and Manufacturers Bank Statutory Trust I, Pulaski Financial Statutory Trust I, and Pulaski Financial Statutory Trust II.

Use of Estimates

In preparing the accompanying Consolidated Financial Statements in conformity with GAAP, Busey’s management is required to make estimates and assumptions that affect the amounts reported on the Consolidated Financial Statements and the disclosures provided. Actual results could differ from those estimates. Material estimates which are particularly susceptible to significant change in the near-term relate to the fair value of assets acquired and liabilities assumed in business combinations, goodwill, income taxes, and the determination of the ACL.

Trust Assets

Assets held for customers in a fiduciary or agency capacity, other than trust cash on deposit at Busey Bank, are not Busey’s assets and, accordingly, are not included in the accompanying Consolidated Financial Statements. Busey had assets under care of $15.66 billion at December 31, 2025, and $13.83 billion at December 31, 2024.

Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, cash items in process of collection, amounts due from other banks, and interest-bearing deposits held with other financial institutions. The carrying amount of these instruments is considered a reasonable estimate of fair value.

Busey maintains its cash in deposit accounts, the balance of which, at times, may exceed federally insured limits. Busey has not experienced any losses in such accounts. Management believes Busey is not exposed to any significant credit risk on cash and cash equivalents.

Restrictions on Cash and Cash Equivalents

At December 31, 2025, cash and cash equivalents included $13.6 million contractually restricted by a third-party service provider, $14.4 million pledged to secure obligations under derivative contracts, and $68.1 million of reserved cash subject to call by the Federal Reserve Bank, as a member of the Federal Reserve System.

Business Combinations

Business combinations are accounted for under ASC Topic 805 “Business Combinations” using the acquisition method of accounting. The acquisition method of accounting requires that the assets acquired and the liabilities assumed are recognized, measured at their estimated fair values, as of the date Busey obtains control of the acquiree (the acquisition date). To estimate fair values of assets acquired and liabilities assumed, Busey may utilize third-party valuations, such as appraisals, or internal valuations based on discounted cash flow analyses or other valuation techniques. Further, management assumptions require consideration of future growth rates, future attrition, discount rates, multiples of earnings or other relevant factors.

Operating results generated from acquired businesses are included with Busey’s results of operations starting from each acquisition date. Acquisition related costs are costs that Busey incurs to effect a business combination, and may include legal, accounting, valuation, other professional or consulting fees, system conversions, and marketing costs. Busey accounts for acquisition related costs by recording them as expenses in the periods in which the costs are incurred and the services are received. Costs that Busey expects, but is not obligated to incur in the future, to effect its plan to exit an activity of an acquiree or to terminate the employment of an acquiree’s employees are not liabilities at the acquisition date. Instead, Busey recognizes these costs in its post-combination Consolidated Financial Statements in accordance with other applicable accounting guidance.

For additional information relating to Busey’s business combination activities, see “Note 2. Business Combinations.”

Investment Securities

Debt Securities Available for Sale

Debt securities classified as available for sale are those debt securities that Busey intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as available for sale would be based on factors including significant movements in interest rates, changes in the maturity mix of Busey's assets and liabilities, liquidity needs, changes in investment strategy or outlook, regulatory capital considerations, and other similar factors. Debt securities available for sale are carried at fair value, with unrealized gains and losses reported in OCI, net of taxes.

Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. The amortization period for certain callable debt securities held at a premium are amortized to the earliest call date, while discounts on debt securities are amortized to maturity. Gains and losses on the sale of debt securities available for sale are recorded on the trade date and are determined using the specific identification method.

Debt securities available for sale are not within the scope of the current expected credit losses methodology, however, the accounting for credit losses on these securities is affected by ASC Subtopic 326-30 “Financial Instruments-Credit Losses—Available-for-Sale Debt Securities.” A debt security available for sale is impaired if the fair value of the security declines below its amortized cost basis. To determine the appropriate accounting, Busey must first determine if it intends to sell the security or if it is more likely than not that it will be required to sell the security before the fair value increases to at least the amortized cost basis. If either of those selling events is expected, Busey will write down the amortized cost basis of the security to its fair value. This is achieved by writing off any previously recorded allowance, if applicable, and recognizing any incremental impairment through earnings. If Busey neither intends to sell the security nor believes it is more likely than not that the Company will be required to sell the security before the fair value recovers to the amortized cost basis, Busey must determine whether any of the decline in fair value has resulted from a credit loss, or if it is entirely the result of noncredit factors.

Busey considers the following factors in assessing whether the decline is due to a credit loss:

•Extent to which the fair value is less than the amortized cost basis;

•Adverse conditions specifically related to the security, an industry, or a geographic area (for example, changes in the financial condition of the issuer of the security, or in the case of an asset-backed debt security, in the financial condition of the underlying loan obligors);

•Payment structure of the debt security and the likelihood of the issuer being able to make payments that increase in the future;

•Failure of the issuer of the security to make scheduled interest or principal payments; and

•Any changes to the rating of the security by a rating agency.

Impairment related to a credit loss must be measured using the discounted cash flow method. Credit loss recognition is limited to the fair value of the security. Impairment is recognized by establishing an allowance for the debt security through the provision for credit losses. Impairment related to noncredit factors is recognized in AOCI, net of applicable taxes. Busey did not recognize any credit impairment on debt securities available for sale in 2025, 2024, or 2023.

Debt Securities Held to Maturity

Debt securities classified as held to maturity are those debt securities that Busey has the intent and ability to hold to maturity and are carried at amortized cost. In 2022, Busey elected to transfer a portion of the agency mortgage-backed securities portfolio from available for sale to held to maturity. While held to maturity securities are within the scope of CECL, the standard allows for an assumption of zero credit losses when the expectation of non-payment is zero. The risk of credit loss related to mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises is considered zero, therefore requiring no allowance to be recorded.

Accrued interest receivable for both debt securities available for sale and debt securities held to maturity totaled $12.5 million at December 31, 2025, and is excluded from the estimate of credit losses. Accrued interest receivable is reported in other assets on the Consolidated Balance Sheets.

For additional information relating to Busey’s debt securities available for sale and debt securities held to maturity, see “Note 3. Debt Securities.”

Equity Securities

Equity securities are carried at fair value with changes in fair value recognized in earnings.

Loans Held for Sale

Loans held for sale include mortgage loans which Busey intends to sell to investors and/or the secondary mortgage market.

Busey accounts for loans held for sale at LOCOM. Loans held for sale are carried at amortized historical cost less loan write-offs and downward fair value adjustments, as may be applicable. Net unrealized losses, if any, are recognized through a valuation allowance by charges to income. Gains and losses on sales of loans are recognized at settlement dates and are determined by the difference between the sales proceeds and the carrying amount, net of the value of any servicing assets for loans that were sold with servicing rights retained.

Loan Servicing

Servicing assets are recognized when servicing rights are acquired or retained through the sale of mortgage and government-guaranteed commercial loans. The unpaid principal balances of loans serviced by Busey for the benefit of others totaled $667.9 million as of December 31, 2025, and $582.5 million as of December 31, 2024, and are not included in the accompanying Consolidated Balance Sheets. During the first quarter of 2024, Busey sold the mortgage servicing rights on approximately $923.5 million of one- to four-family mortgage loans for an estimated pre-tax gain of $7.5 million, which enabled Busey to sell available-for-sale debt securities with a book value of approximately $108.2 million for a pre-tax loss of $6.8 million.

Servicing rights are initially recorded at estimated fair value, which is determined using a valuation model that calculates the present value of estimated future net servicing income. Capitalized servicing rights are reported in other assets and are amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. The amortization of mortgage servicing rights is included in mortgage revenue. The amortization of government-guaranteed commercial loan servicing rights is included in other income.

Servicing rights are periodically evaluated for impairment based on the fair value of those rights as compared to the carrying amount. Fair values are estimated using discounted cash flows based on expected prepayment rates and other inputs. For purposes of measuring impairment, servicing rights are stratified by one or more predominant characteristics of the underlying loans. A valuation allowance is recognized in the amount by which the amortized cost of the rights for each stratum exceeds its fair value, if any. If Busey later determines that all or a portion of the impairment no longer exists for a particular group of loans, a reversal of the allowance may be recorded in current period earnings. Busey had $0.2 million of impairment recorded at December 31, 2025, and an immaterial amount at December 31, 2024.

Servicing fee income is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal and are recorded as income when earned.

Portfolio Loans

Loans that management has the intent and ability to hold for the foreseeable future, or until maturity or pay-off, are reported at the principal balance outstanding, net of purchase premiums and discounts, deferred origination fees and costs, charge-offs, and the ACL.

Loan origination fees, net of certain direct loan origination costs, are deferred and the net amount is amortized as an adjustment of the related loan’s yield. Busey amortizes the net amount over the contractual life of the related loan.

Syndication fees are earned when Busey is the lead agent in structuring, arranging, and administering a syndicated loan. These fees are recognized as other noninterest income when the syndication is complete, except when a portion of the loan is retained, in which case Busey’s loan policies would apply.

Interest income is accrued daily on outstanding loan balances. Loans are placed on non-accrual status when, in management’s opinion, the borrower may be unable to meet payment obligations as they become due, as well as when required by regulatory provisions. Loans may be placed on non-accrual status regardless of whether or not such loans are considered past due. Past due status is based on the contractual terms of the loan.

Interest accrued but not collected for loans that are charged-off or placed on non-accrual status is reversed against interest income. The interest on non-accrual loans is accounted for on the cost-recovery method, until returned to accrual status. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.

For additional information relating to Busey’s portfolio loans, see “Note 4. Portfolio Loans.”

Loan Modifications

Busey’s loan portfolio includes certain loans that have been modified in accordance with loan refinancing and restructuring guidance in ASC Subtopic 310-20-35-9 through 35-11 “Receivables—Nonrefundable Fees and Other Costs—Subsequent Measurement—Loan Refinancing or Restructuring” for borrowers experiencing financial difficulty. For additional information about loan modifications for borrowers experiencing financial difficulty, see “Note 4. Portfolio Loans.”

Allowance for Credit Losses

The ACL is a significant estimate on Busey’s Consolidated Financial Statements, affecting both earnings and capital. The ACL is a valuation account that is deducted from the portfolio loans’ amortized cost bases to present the net amount expected to be collected on the portfolio loans. A portfolio loan balance is charged-off against the ACL when management believes that balance is uncollectible. Recoveries will be recognized up to the aggregate amount of previously charged-off balances. The ACL is established through the provision for credit loss charged to income.

A loan’s amortized cost basis is comprised of the unpaid principal balance of the loan net of charge-offs, accrued interest receivable, purchase premiums or discounts, and net deferred origination fees or costs. Busey has estimated its allowance on the amortized cost basis of the loans, exclusive of government guaranteed loans and accrued interest receivable. As permitted under the practical expedient provided within ASC 326-20-35-6, Busey did not record an ACL for its Life Equity Loan® portfolio due to no expected credit loss at default. Busey writes off uncollectible accrued interest receivable in a timely manner and has elected to not measure an allowance for accrued interest receivable. Busey presents the aggregate amount of accrued interest receivable for all financial instruments in other assets on the Consolidated Balance Sheets and the balance of accrued interest receivable is disclosed in “Note 20. Fair Value Measurements.”

Busey’s methodology influences, and is influenced by, Busey’s overall credit risk management processes. The ACL is managed in accordance with GAAP to provide an adequate reserve for expected credit losses that is reflective of management’s best estimate of what is expected to be collected. The ACL must be determined on a collective (pool) basis when similar risk characteristics exist. On a case-by-case basis, Busey may conclude that a loan should be evaluated on an individual basis based on disparate risk characteristics.

The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the amortized cost basis. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, or term as well as for changes in environmental conditions such as changes in unemployment rates, property values, and other relevant factors. The calculation also contemplates that Busey may not be able to make or obtain such forecasts for the entire life of the financial assets and requires a reversion to historical credit loss information. Due to the continued economic uncertainty in the markets in which the Company operates, Busey will continue to utilize a forecast period of 12 months with an immediate reversion to historical loss rates beyond this forecast period in its ACL estimate.

Factors that influence Busey’s calculation of its ACL include changes in economic conditions and forecasts, originated and acquired loan portfolio composition, prepayment speeds, credit performance trends, portfolio duration, and other factors.

For additional information relating to Busey’s ACL, see “Note 4. Portfolio Loans.”

Assets Purchased with Credit Deterioration

Acquired loans are separated into two categories based on the credit risk characteristics of the underlying borrowers: (1) PCD, for loans which have experienced more than insignificant credit deterioration since origination, or (2) all other loans.

For PCD loans, an ACL is determined at the date of acquisition using the same methodology as other loans held for investment. This initial ACL, when determined on a collective basis, is allocated to the individual loans, and the sum of each loan’s purchase price and ACL becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. The ACL on PCD loans is recorded in the acquisition accounting and no provision for credit losses is recognized at the acquisition date. Subsequent changes to the ACL are recorded as a charge to the provision for credit losses.

For all other loans, an ACL is established immediately after the acquisition through a charge to the provision for credit losses.

For additional information relating to Busey’s PCD assets, see “Note 2. Business Combinations” and “Note 4. Portfolio Loans.”

Other Real Estate Owned and Other Repossessed Assets

OREO and other repossessed assets represent properties and other assets acquired through foreclosure or other proceedings in settlement of loans. OREO and other repossessed assets are recorded at the fair value of the property or asset, less estimated costs of disposal, which establishes a new cost basis. Any adjustment to fair value at the time of transfer to OREO or other repossessed assets is charged to the ACL. OREO property and other repossessed assets are evaluated regularly to ensure the recorded amount is supported by its current fair value; write downs or valuation allowances to reduce the carrying amount to fair value less estimated costs to dispose are recorded, as necessary. OREO and other repossessed assets are included in other assets on the Consolidated Balance Sheets. Revenue, expense, gains, and losses from the operations of foreclosed assets are included in earnings.

For additional information relating to Busey’s OREO and other repossessed assets, see “Note 5. Other Real Estate Owned and Other Repossessed Assets.”

Long-Lived Assets

Long-lived assets, including premises and equipment, right of use assets, and intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. An impairment loss is recognized when estimated undiscounted future cash flows from operations of the asset are less than the carrying value of the asset. Cash flows used for this analysis are those directly associated with, and that are expected to arise as a direct result of, the use and eventual disposition of the asset. Any impairment loss is measured as the amount by which the carrying value of the asset class exceeds its fair value.

Premises and Equipment

Land is carried at cost less accumulated depreciation of depreciable land improvements. Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed by the straight-line method over the estimated useful lives of the assets. The estimated useful lives for premises and equipment are:


Asset Description						Estimated Useful Life
Buildings and improvements						3 — 40 years
Furniture and equipment						3 — 10 years

Premises and equipment are reviewed for impairment in accordance with Busey’s policies regarding long-lived assets.

Bank property held for sale, included in premises and equipment, represents certain banking center office buildings which Busey had closed and consolidated with other existing banking centers. Bank property held for sale is measured at the lower of amortized cost or estimated fair value less estimated costs to sell, and depreciation has been stopped.

For additional information relating to Busey’s premises and equipment, see “Note 6. Premises and Equipment.”

Leases

A determination is made at inception if an arrangement contains a lease. For arrangements containing leases, Busey classifies the lease as either operating, finance, or short-term. Busey recognizes operating and finance leases as right of use assets and corresponding lease liabilities. Right of use assets are recognized on the lease commencement date at amounts equal to the respective lease liabilities, adjusted for prepaid lease payments, initial direct costs, and lease incentives received. Lease-related liabilities are recognized at the present value of the remaining contractual fixed lease payments, discounted using the rate implicit in the lease or Busey’s incremental borrowing rate.

ASC Topic 842 “Leases” requires the use of the rate implicit in the lease whenever this rate is readily determinable. If not readily determinable, Busey uses its incremental borrowing rate at lease inception, on a collateralized basis, over a similar term. For operating leases existing prior to Busey’s adoption of ASC Topic 842 on January 1, 2019, Busey used a borrowing rate that corresponded to the lease term remaining as of the date of adoption of ASC Topic 842.

Busey’s lease agreements often include one or more options to renew at Busey’s discretion. When Busey considers the exercise of a renewal option to be reasonably certain, contractual fixed lease payments for the renewal term are included in the calculation of the right of use asset and lease liability.

Right of use assets are reviewed for impairment in accordance with Busey’s policies regarding long-lived assets.

Operating Leases

Right of use assets for operating leases are included in other assets on the Consolidated Balance Sheets. Lease liabilities for operating leases are included in other liabilities on the Consolidated Balance Sheets.

Lease costs for operating leases are recognized on a straight-line basis over the lease term. Lease costs are reflected as noninterest expense for net occupancy of premises or for furniture and equipment expenses, as appropriate, on the Consolidated Statements of Income. Variable lease payments are expensed as incurred.

Finance Leases

Right of use assets for finance leases and the related accumulated amortization are included in premises and equipment, net, on the Consolidated Balance Sheets. Lease liabilities for finance leases are included in long-term borrowings on the Consolidated Balance Sheets. Repayments of the principal portion of finance lease liabilities are reflected as financing activities on the Consolidated Statements of Cash Flows.

Lease costs for finance leases are composed of interest expense and amortization expense. Interest expense on finance leases is reflected as interest expense on long-term borrowings on the Consolidated Statements of Income. Amortization expense on finance leases is reflected as noninterest expense for net occupancy of premises on the Consolidated Statements of Income.

Busey had one finance lease as of December 31, 2025, which was acquired through its acquisition of CrossFirst.

Short-term Leases

Leases with terms of twelve months or less are classified as short-term leases. Busey made an accounting policy election to not recognize short-term leases on the balance sheet. Lease costs for short-term leases are reflected as noninterest expense for net occupancy of premises or for furniture and equipment expenses, as appropriate, on the Consolidated Statements of Income.

For additional information relating to Busey’s leases, see “Note 7. Leases.”

Goodwill and Other Intangibles

Goodwill represents the excess of consideration transferred in a business combination over the fair value of the net assets acquired. Goodwill is not amortized but is subject to at least annual impairment assessments. A separate goodwill impairment assessment is performed for each reporting unit on the goodwill that has been allocated to it. A reporting unit is a component of an operating segment that constitutes a business for which discrete financial information is available, and segment management regularly reviews the operating results of that component. Busey’s reporting units are the same as its operating segments. Busey has established December 31 as the annual impairment assessment date for each of its reporting units. As part of this assessment, each reporting unit's carrying value is compared to its fair value.

Busey estimates the fair value of its reporting units as of the measurement date utilizing valuation methodologies including comparable company analysis and precedent transaction analysis. Goodwill is considered impaired if the carrying value of the reporting unit exceeds its fair value. There was no impairment as of December 31, 2025 or 2024.

Other intangible assets consist of core deposit and acquired customer relationship intangible assets arising from acquisitions. Other intangible assets are amortized over their estimated useful lives, and are reviewed for impairment in accordance with Busey’s policies regarding long-lived assets.

For additional information relating to Busey’s goodwill and other intangible assets, see “Note 8. Goodwill and Other Intangible Assets.”

Cash Surrender Value of Bank Owned Life Insurance

Busey has purchased, or acquired through acquisitions, life insurance policies on certain executives and senior officers. Life insurance is recorded at its cash surrender value, which approximates its fair value.

Busey maintains a liability for post-employment benefits related to split-dollar life insurance arrangements. In an endorsement split-dollar life insurance arrangement, the employer owns and controls the policy, and the employer and employee split the life insurance policy’s cash surrender value and/or death benefits. If the employer agrees to maintain a life insurance policy during the employee’s retirement, the present value of the cost of maintaining the insurance policy is accrued over the employee’s active service period. Similarly, if the employer agrees to provide the employee with a death benefit, the present value of the death benefit is accrued over the employee’s active service period. Busey accrued liabilities for these arrangements totaling $5.5 million as of December 31, 2025, and $5.7 million as of December 31, 2024. Liabilities for post-employment benefits are included in other liabilities on the Consolidated Balance Sheets.

Restricted Bank Stock

During the fourth quarter of 2024, Busey Bank became a member of the Federal Reserve System. Federal Reserve member banks are required to own a certain amount of Federal Reserve Bank stock. Busey's investment in Federal Reserve Bank stock was $68.1 million as of December 31, 2025, and $43.9 million as of December 31, 2024. Busey’s investment in Federal Reserve Bank stock represents approximately half of the total required subscription, and the remaining half is unpaid and remains subject to call by the Federal Reserve Bank. As such, Busey reserved cash of $68.1 million as of December 31, 2025, and $43.9 million as of December 31, 2024.

Busey Bank is also a member of the FHLB system. FHLB members are required to own a certain amount of FHLB stock based on the level of borrowings and other factors, and may invest in additional amounts. Busey's investment in FHLB stock was $8.9 million as of December 31, 2025, and $6.0 million as of December 31, 2024.

In connection with the CrossFirst acquisition, Busey acquired Bankers’ Bank of the West Bancorp, Inc. bank stock and has an immaterial amount as of December 31, 2025.

Federal Reserve Bank stock, FHLB stock, and Bankers’ Bank of the West Bancorp, Inc. bank stock are carried at cost in restricted bank stock on the Consolidated Balance Sheets. Cash reserves are included in interest-bearing deposits as part of Busey’s total cash and cash equivalents balances reported on the Consolidated Balance Sheets. Dividends are reported as interest income on the Consolidated Statements of Income. Dividend income is accrued on Federal Reserve Bank stock and is recognized when declared on FHLB stock.

Transfers of Financial Assets

Transfers of financial assets are accounted for as sales only when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when: (1) the assets have been isolated from Busey’s assets, (2) the transferee obtains the right to pledge or exchange the assets it receives, and no condition both constrains the transferee from taking advantage of its right to pledge or exchange and provides more than a trivial benefit to the transferor, and (3) Busey does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets. When transfers of financial assets fail to meet these criteria, those transfers are accounted for as secured borrowings.

Income Taxes

Busey is subject to income taxes in U.S. federal and various state jurisdictions. First Busey Corporation and its subsidiaries file consolidated federal and state income tax returns with each subsidiary computing its taxes on a separate entity basis. Busey monitors evolving federal and state tax legislation and its potential impact on operations on an ongoing basis.

On July 4, 2025, federal legislation was enacted, commonly referred to as the "One Big Beautiful Bill Act" ("OBBBA"), which made many tax provisions of the 2017 Tax Cuts and Jobs Act ("TCJA") permanent. It also introduced several notable amendments to TCJA. Most notably, OBBBA reinstated immediate expensing of domestic research and development expenditures, 100% bonus depreciation on qualifying assets placed in service after January 19, 2025, favorable modifications to Section 163(j) of the Internal Revenue Code, and provided incentives for financial institutions to increase lending in rural and agricultural communities. The effects of this legislation have been reflected in the December 31, 2025, Consolidated Financial Statements. Busey has determined that the impact of this legislation on future reporting periods is not expected to be material.

Tax regulations within each jurisdiction are subject to the interpretation of the related tax laws and regulations, which requires significant judgment. Positions taken in tax returns may be subject to challenge upon examination by the taxing authorities. Uncertain tax positions are initially recognized on the Consolidated Financial Statements when it is more likely than not the position will not be sustained upon examination by the tax authorities. Such tax positions are both initially and subsequently measured as the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon settlement with the tax authority, assuming full knowledge of the position and all relevant facts. When applicable, Busey recognizes interest accrued related to unrecognized tax benefits and penalties in operating expenses. Busey had no accruals for payments of interest and penalties related to uncertain tax positions at December 31, 2025. The federal and state tax returns filed by First Busey Corporation and its subsidiaries remain subject to examination by taxing authorities for three years.

Under GAAP, a valuation allowance is required to be recognized if it is more likely than not that the deferred tax assets will not be realized. The determination of the recoverability of the deferred tax assets is highly subjective and dependent upon judgment concerning management’s evaluation of both positive and negative evidence, the forecasts of future income, applicable tax planning strategies, and assessments of current and future economic and business conditions.

For additional information relating to Busey’s income taxes, see “Note 13. Income Taxes.”

Tax Credit Investments and Other Investments in Unconsolidated Entities

Busey has invested in certain tax-advantaged projects promoting affordable housing, community development, and renewable energy sources. These investments are designed to generate returns primarily through the realization of federal and state income tax credits and other tax benefits, such as tax deductions from operating losses of the investments, over specified time periods. Busey accounts for investments in tax-advantaged projects using the proportional amortization method. Income tax credits and other tax benefits, net of investment amortization, were included as a component of Busey’s estimated annual effective tax rate used for the calculation of income taxes presented on the Consolidated Statements of Income.

In addition, Busey has private equity investments, which are primarily in funds that invest in small businesses across diverse sectors including, but not limited to, financial technology, business services, manufacturing, agribusiness, healthcare, software as a service, and environmental, or supporting the preservation of affordable housing.

Private equity investments in unconsolidated entities involve significant management judgments, including a determination of which entities have the power to direct activities, and whether these entities are variable interest entities. Busey is required to evaluate whether to consolidate a variable interest entity at both inception and on an ongoing basis. Busey is not required to consolidate variable interest entities in which it has concluded it does not have a controlling financial interest and is not the primary beneficiary. Busey’s maximum exposure to loss related to its investments in these unconsolidated variable interest entities is limited to the carrying amount of the investments and previously recorded tax credits which remain subject to recapture by taxing authorities based on compliance features required to be met at the project level. Busey believes potential losses from these investments are unlikely.

Private equity investments are accounted for under the equity method, utilizing the practical expedient to fair value measurement, as appropriate. Most of these investments support Busey’s regulatory compliance with the Community Reinvestment Act.

For additional information relating to Busey’s tax credit and other investments, see “Note 14. Tax Credit Investments and Other Investments in Unconsolidated Entities.”

Stock-Based Compensation

Busey’s equity incentive plans are designed to encourage ownership of its common stock by its employees and directors, to provide additional incentive for them to promote the success of Busey’s business, and to attract and retain talented personnel.

Stock Options

Busey has outstanding stock options assumed from acquisitions. All stock options that remained outstanding as of December 31, 2025, were fully vested.

Stock-Settled Appreciation Rights

Busey assumed SSARs in connection with the CrossFirst acquisition. The fair value of each SSAR was estimated at the acquisition date using a Monte Carlo simulation.

2020 Equity Plan

The 2020 Equity Plan was originally approved by stockholders at the 2020 Annual Meeting of Stockholders. A description of the 2020 Equity Plan, as originally approved, can be found in Appendix A within Busey’s Proxy Statement for the 2020 Annual Meeting of Stockholders filed on April 9, 2020. Upon the 2020 Equity Plan’s original approval, it replaced the 2010 Equity Incentive Plan and the First Community 2016 Equity Incentive Plan, which, from time to time, Busey used to grant equity awards to legacy employees of First Community. Under the terms of the 2020 Equity Plan, Busey has granted RSU, DSU, and PSU awards.

An amendment to and restatement of the 2020 Equity Plan was approved by stockholders at the 2023 Annual Meeting of Stockholders. The terms of the amended and restated 2020 Equity Plan are substantially identical to those of the originally approved 2020 Equity Plan, other than a 1,350,000 increase in the number of shares authorized for issuance under the plan. More information can be found in Appendix A within Busey’s Proxy Statement for the 2023 Annual Meeting of Stockholders filed on April 14, 2023.

All of Busey’s employees and directors and those of its subsidiaries are eligible to receive awards under the plans.

RSU Awards

Busey grants RSU awards to members of management periodically throughout the year. RSU awards are stock-based awards for which vesting is conditional upon meeting established service criteria. Each RSU represents the future right to receive one share of Busey’s common stock. Busey’s RSUs have requisite service periods ranging from one year to five years, and are subject to accelerated vesting upon eligible retirement from Busey. Recipients earn quarterly dividend equivalents on their respective RSUs, which entitle the recipients to additional units. Therefore, dividends earned each quarter compound based upon the updated unit balances.

PSU Awards

Busey grants PSU awards to members of management periodically throughout the year. PSU awards are stock-based awards for which vesting is conditional upon meeting established performance criteria for the applicable performance period and remaining employed through the end of such performance period. Each PSU represents the future right to receive one share of Busey’s common stock. The number of PSUs that ultimately vest will be determined based on the extent to which the established performance criteria are achieved. Busey’s PSUs are subject to accelerated service-based vesting conditions upon eligible retirement from Busey. After performance determination, dividend equivalents are compounded based upon each dividend date during the performance period.

DSU Awards

Busey grants DSU awards to its non-employee directors. DSU awards are stock-based awards with a deferred settlement date. Each DSU represents the future right to receive one share of Busey’s common stock. DSUs vest over a one-year period following the grant date. Under the 2020 Equity Plan, DSUs are generally subject to the same terms as RSUs, except that following vesting of DSUs, settlement occurs within 30 days following the earlier of separation from the board or a change in control of the Company. After vesting and prior to delivery, DSUs will continue to earn dividend equivalents.

Employee Stock Purchase Plan

The First Busey Corporation ESPP was approved at Busey’s 2021 Annual Meeting of Stockholders and details can be found in Appendix A within First Busey’s Definitive Proxy Statement filed with the SEC on April 8, 2021. The purpose of the ESPP is to provide a means through which Busey associates may acquire a proprietary interest in the Company by purchasing shares of its common stock at a discounted price through voluntary payroll deductions, to assist in retaining the services of current associates and securing and retaining the services of new associates, and to provide incentives for Busey associates to exert maximum efforts toward the Company’s success.

Because the ESPP provides the opportunity for Busey associates to purchase Busey’s common stock at a 15% discount from the market price, the plan is considered to be a compensatory plan under current accounting guidance. Therefore, the entire amount of the discount is recognized in salaries, wages, and employee benefits on the Consolidated Statements of Income.

For additional information relating to Busey’s stock-based compensation, see “Note 16. Stock-Based Compensation.”

Preferred Stock

Busey’s Series A Non-Cumulative Perpetual Preferred Stock

On March 1, 2025, in connection with the CrossFirst acquisition, Busey issued 7,750 shares of Busey Series A Preferred Stock, which were issued to holders of shares of CrossFirst Series A Non-Cumulative Perpetual Preferred Stock. The Busey Series A Preferred Stock bears a dividend rate of 8.00% per annum on the liquidation preference of $1,000 per share. Dividend payments commenced with the June 15, 2025, payment date. The Busey Series A Preferred Stock is not subject to any mandatory redemption, sinking fund, or similar provision. Busey may redeem the Busey Series A Preferred Stock, in whole or in part, on or after March 1, 2030, subject to the approval of the appropriate federal banking agency, at a redemption price of $1,000 per share, plus any declared and unpaid dividends, without accumulation of any undeclared dividends, to, but excluding, the date of redemption. Additional information about the Busey Series A Preferred Stock can be found in (a) Busey’s Form 8‑K filed with the SEC on August 27, 2024, and the Agreement and Plan of Merger, dated August 26, 2024, by and between First Busey Corporation and CrossFirst Bankshares, Inc. filed therewith; and (b) Busey ’s Form 8 ‑K filed with the SEC on March 3, 2025, and the Certificate of Designation of Series A Non -Cumulative Perpetual P referred Stock of First Busey Corporation filed therewith.

Busey’s 8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock

On May 20, 2025, Busey issued 8,600,000 depositary shares (the “Depositary Shares,”), which are traded on The Nasdaq Global Select Market under the symbol “BUSEP.” Each Depositary Share represents a 1/40th interest in a share of Busey Series B Preferred Stock. The Series B Preferred Stock has a liquidation preference of $1,000 per share (equivalent to $25 per Depositary Share). Dividend payments for the Series B Preferred Stock commenced with the September 1, 2025, payment date. The Series B Preferred Stock is not subject to any mandatory redemption, sinking fund, or similar provision. Busey may redeem the Series B Preferred Stock, in whole or in part, at its option, on any dividend payment date on or after June 1, 2030, subject to the approval of the appropriate federal banking agency, at a redemption price of $1,000 per share (equivalent to $25 per Depositary Share) plus any declared and unpaid dividends (without regard to any undeclared dividends) to, but excluding, the date of redemption. Additional information about the Depositary Shares and the Series B Preferred Stock can be found in Busey’s Form 8-K filed with the SEC on May 20, 2025, and the exhibits filed therewith.

Preferred Stock Summary

The following table summarizes Busey’s preferred stock issuances as of December 31, 2025:



Title of Each Issue	Shares Authorized	Shares Issued	Shares Outstanding	Balance		Per Share Preference in Liquidation		Aggregate Liquidation Preference ($ in 000's)

Preferred stock, $0.001 par value:	1,000,000
Series A Non-Cumulative Perpetual Preferred Stock	7,750	7,750	7,750	$	7.75	$	1,000.00	$	7,750
8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock	230,000	215,000	215,000	$	215.00	$	1,000.00	$	215,000

Busey had no preferred stock issuances as of December 31, 2024.

Changes in preferred stock issued are presented in the following table:


	Years Ended December 31,
Title of Each Issue	2025		2024		2023


Series A Non-Cumulative Perpetual Preferred Stock	$	7.75	$	—	$	—
8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock	215.00		—		—

Treasury Stock

Treasury stock acquired is recorded at cost. Treasury stock issued is valued based on the “first-in, first-out” method. Gains and losses on issuance are recorded as increases or decreases to additional paid-in capital.

Off-Balance Sheet Arrangements

In the normal course of business, to meet the financing needs of its customers, Busey is a party to credit-related financial instruments with off-balance-sheet risk, including commitments to extend credit and standby letters of credit. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized on the Consolidated Balance Sheets. Busey’s exposure to credit loss is represented by the contractual amount of the commitments. Busey uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments.

Commitments to extend credit are agreements to lend to a customer as long as no condition established in the contract has been violated. These commitments are generally at variable interest rates, they generally have fixed expiration dates or other termination clauses, and they may require the customer to pay a fee. Commitments for lines of credit may expire without being drawn upon; therefore, the total commitment amounts do not necessarily represent future cash requirements. These commitments may be secured based on management’s credit evaluation of the borrower.

Standby letters of credit are conditional commitments Busey has issued to guarantee the performance of a customer’s obligation to a third-party. Those guarantees are primarily issued to support public and private borrowing arrangements, including bond financing and similar transactions. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. Busey holds collateral, which may include accounts receivable, inventory, property and equipment, and income producing properties, supporting those commitments if deemed necessary. In the event the customer does not perform in accordance with the terms of the agreement with the third-party, Busey would be required to fund the commitment. If the commitment is funded, Busey would be entitled to seek recovery from the customer.

Busey estimates expected credit losses for off-balance sheet arrangements over the contractual period during which it is exposed to credit risk via a present contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the issuer. To be considered unconditionally cancellable for accounting purposes, Busey must have the ability to, at any time, with or without cause, refuse to extend credit under the commitment. Off-balance-sheet credit exposure segments share the same risk characteristics as portfolio loans. Busey incorporates a probability of funding and utilizes the ACL loss rates to calculate a reserve for off-balance-sheet credit exposure, which is carried on the Consolidated Balance Sheets as a component of the ACL. The reserve for off-balance-sheet credit exposure is adjusted as a provision for unfunded commitments and is reported as a component of the provision for credit losses in the accompanying Consolidated Statements of Income. Liabilities recorded as reserves for Busey’s off-balance sheet credit exposure under these commitments totaled $13.0 million as of December 31, 2025, and $6.0 million as of December 31, 2024.

For additional information relating to Busey’s off-balance sheet arrangements, see “Note 18. Outstanding Commitments and Contingent Liabilities.”

Derivative Financial Instruments

Busey utilizes interest rate swap agreements as part of its asset liability management strategy to help manage its interest rate risk position. Additionally, Busey enters into derivative financial instruments, including interest rate lock commitments issued to residential loan customers for loans that will be held for sale, forward sales commitments to sell residential mortgage loans to investors, and interest rate swaps with customers and other third parties.

Interest Rate Swaps Designated as Cash Flow Hedges

Busey entered into derivative instruments designated as cash flow hedges. For a derivative instrument that qualifies and is designated as a cash flow hedge, the change in fair value of the derivative instrument is reported as a component of OCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings, and in the same category affected by the hedged transaction on the Consolidated Statements of Income. Changes in fair value of components excluded from the assessment of effectiveness are recognized in current earnings.

Interest Rate Swaps Not Designated as Hedges

Busey may offer derivative contracts to its customers in connection with their risk management needs. Busey manages the risk associated with these contracts by entering into equal and offsetting derivatives with third-party dealers. Generally, these derivatives have worked together as an economic interest rate hedge, but Busey did not designate them for hedge accounting treatment. Consequently, changes in fair value of the corresponding derivative financial asset or liability were recorded as either a charge or credit to current earnings during the period in which the changes occurred. Swap fee revenue is typically recognized upon completion of Busey’s performance obligation.

Interest Rate Lock Commitments

Interest rate lock commitments that meet the definition of derivative financial instruments under ASC Topic 815 “Derivatives and Hedging” are carried at their fair values in other assets or other liabilities on the Consolidated Financial Statements, with changes in the fair values of the corresponding derivative financial assets or liabilities recorded as either a charge or credit to mortgage revenue during the period in which the changes occurred.

Forward Sales Commitments

Busey economically hedges mortgage loans held for sale and interest rate lock commitments issued to its residential loan customers related to loans that will be held for sale by obtaining corresponding forward sales commitments with an investor to sell the loans at an agreed-upon price at the time the interest rate locks are issued to the customers. Forward sales commitments that meet the definition of derivative financial instruments under ASC Topic 815 “Derivatives and Hedging” are carried at their fair values in other assets or other liabilities on the Consolidated Financial Statements. While such forward sales commitments generally served as an economic hedge to mortgage loans held for sale and interest rate lock commitments, Busey did not designate them for hedge accounting treatment. Changes in fair value of the corresponding derivative financial asset or liability were recorded as either a charge or credit to mortgage revenue during the period in which the changes occurred.

Risk Participation Agreements

To manage the credit risk exposure related to customer-facing swaps, Busey entered into risk participation agreements in conjunction with loan participation arrangements with other financial institutions. These agreements transfer credit risk related to an interest rate swap between Busey and another financial institution. Risk participation agreements that Busey has entered into are structured as follows:

•Busey has a swap agreement with a customer. Busey (purchaser) entered into a risk participation agreement with a counterparty (seller), under which the counterparty receives a fee to accept a portion of the credit risk. If Busey’s customer defaults on the swap contract, the counterparty to the risk participation agreement must reimburse Busey for the counterparty's percentage of the positive fair value (from the purchaser’s perspective) of the customer swap as of the default date. If the customer swap has a negative fair value (from the purchaser’s perspective), the counterparty has no reimbursement requirements. If Busey’s customer defaults on the swap contract and the counterparty (seller) fulfills its payment obligations under the risk participation agreement, the counterparty (seller) is entitled to a pro rata share of Busey’s claim against the customer under the terms of the swap agreement.

•A counterparty has a swap agreement with a customer. Busey (seller) entered into a risk participation with a counterparty (purchaser), under which Busey receives a fee to accept a portion of the credit risk. If the counterparty’s customer defaults on the swap contract, Busey must reimburse the counterparty (purchaser) for Busey's percentage of the positive fair value (from the purchaser’s perspective) of the customer swap as of the default date. If the customer swap has a negative fair value (from the purchaser’s perspective), Busey has no reimbursement requirements. If the counterparty’s customer defaults on the swap contract and Busey (seller) fulfills its payment obligations under the risk participation agreement, Busey (seller) is entitled to a pro rata share of the counterparty’s claim against the customer under the terms of the swap agreement.

For additional information relating to Busey’s derivative financial instruments, see “Note 19. Derivative Financial Instruments.”

Fair Value of Financial Instruments

Fair values of financial instruments are estimated using relevant market information and other assumptions. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect these estimates.

For additional information relating to Busey’s fair value measurements, see “Note 20. Fair Value Measurements.”

Comprehensive Income

Accounting principles generally require that recognized revenue, expenses, gains, and losses be included in net income. However, certain changes in assets and liabilities, such as unrealized gains and losses on available for sale debt securities and unrealized gains and losses on cash flow hedges, are reported net of taxes as a separate component within the equity section of the balance sheet. Such items, along with net income, are components of comprehensive income. Busey uses the specific identification method to determine the cost of securities sold and the amounts to be reclassified out of AOCI into earnings. Income tax effects of these items are released from AOCI contemporaneously with the related gross pretax amount.

Operating Segments

Operating segments are components of a business that (1) engage in business activities from which the component may earn revenues and incur expenses; (2) have operating results that are reviewed regularly by the entity’s chief operating decision maker to make decisions about resources to be allocated to the segments and assess their performance; and (3) for which discrete financial information is available. Busey’s chief executive officer is its chief operating decision maker. Busey’s has three reportable segments: Banking, Wealth Management, and FirsTech.

For additional information relating to Busey’s operating segments, see “Note 23. Operating Segments and Related Information.”

Revenue

ASC Topic 606 “Revenue from Contracts with Customers” outlines a single model for companies to use in accounting for revenue arising from contracts with customers and supersedes most prior revenue recognition guidance, including industry-specific guidance. ASC Topic 606 requires that companies recognize revenue based on the value of transferred goods or services as they occur in the contract and establishes additional disclosures. Busey’s revenue is comprised of net interest income, which is explicitly excluded from the scope of ASC Topic 606, and noninterest income. Busey has evaluated its noninterest income and the nature of its contracts with customers and determined that further disaggregation of revenue beyond what is presented in the accompanying Consolidated Financial Statements is not necessary. Busey satisfies its performance obligations on its contracts with customers as services are rendered, so there is limited judgment involved in applying ASC Topic 606 that affects the determination of the timing and amount of revenue from contracts with customers.

Descriptions of Busey’s primary revenue generating activities that are within the scope of ASC Topic 606, and are presented in the accompanying Consolidated Statements of Income as components of noninterest income, include wealth management fees, payment technology solutions, and fees for customer services.

Wealth Management Fees

Wealth management fees represent fees due from wealth management customers as consideration for managing the customers' assets. Wealth management and trust services include custody of assets, investment management, trust services, farm management, and other fiduciary activities. Also included are fees received from a third-party broker-dealer as part of a revenue sharing agreement for fees earned from customers that Busey refers to the third party. Revenue is recognized when the performance obligation is completed, which is generally monthly.

Payment Technology Solutions

Payment technology solutions revenue represents transaction-based fees for technology-driven payment solutions primarily for walk-in, lockbox, interactive voice recognition, and online bill payments through Busey Bank’s subsidiary, FirsTech. Revenue is recognized when the performance obligation is completed, which is generally monthly.

Treasury Management Services, Card Services and ATM Fees, and Other Service Charges on Deposit Accounts

Treasury management services include business analysis charges and wire transfer fees. Card services and ATM fees include interchange and ATM related fees. Other service charges on deposit accounts include non-sufficient funds and service charges on personal accounts. Revenue is recognized when the performance obligation is completed, which is generally monthly for account maintenance services, or when a transaction has been completed. Payments for such performance obligations are generally received at the time the performance obligations are satisfied.

Reclassifications

Reclassifications have been made to certain prior year account balances, with no effect on net income or stockholders’ equity, to be consistent with the classifications adopted as of and for the year ended December 31, 2025.

Impact of Recently Adopted Accounting Standards

In March 2024, the FASB issued ASU 2024-01 “Compensation-Stock Compensation (Topic 718): Scope Application of Profits Interest and Similar Awards” to clarify that certain “profits interests” are within the scope of Topic 718 by amending the language and providing illustrative examples on how the scope guidance in paragraph 718-10-15-3 should be applied. This update is intended to improve clarity of the accounting standards codification, not to change the guidance. This update is effective for Busey for annual and interim reporting periods beginning January 1, 2025. Busey does not currently have any Profit Interest and Similar Awards, so adoption of this ASU did not have any impact on its financial position and results of operations.

In December 2023 the FASB issued ASU 2023-09 “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” requiring all entities to disclose, on an annual basis, income taxes paid (net of refunds received) disaggregated by jurisdiction. All entities must disclose the amount of income taxes paid to each individual jurisdiction in which income taxes paid (net of refunds) is equal to or exceeds 5% of total income taxes paid. Disclosure of comparative information by jurisdiction for all years presented is not required, a jurisdiction only needs to be disclosed in the periods where the 5% threshold is met. Public business entities are required to adopt ASU 2023-09 starting with the first year beginning after December 15, 2024; accordingly, Busey is subject to ASU 2023-09 starting in 2025. Busey reported Federal income tax payments of $16.8 million and income tax payments to all other jurisdictions of $4.1 million, net of related refunds, for total income tax payments of $20.9 million.

Recently Issued Accounting Standards Not Yet Adopted

In November 2025, the FASB issued ASU 2025-09 “Derivatives and Hedging (Topic 815): Hedge Accounting Improvements” to expand the hedged risks permitted to be aggregated in a group of individual forecasted transactions, enabling entities to apply hedge accounting treatment to a broader portfolio of forecasted transactions. Under the amendments in this update, a group of individual forecasted transactions can be designated as a cash flow hedge if they have a similar risk exposure. Individual forecasted transactions are considered to have a similar risk exposure when the derivative used as the hedging instrument is highly effective against each hedged risk in the group. This update is to be applied on a prospective basis for all hedging relationships; there is an option to elect to adopt the amendments in this update for hedging relationships that exist as of the date of adoption. This update will be effective for Busey for annual and interim reporting periods beginning January 1, 2027. Early adoption is permitted. Busey is currently evaluating the effect this ASU may have on its financial position and results of operations.

In November 2025, the FASB issued ASU 2025-08 “Financial Instruments—Credit Losses (Topic 326): Purchased Loans” to expand the population of purchased loans subject to a “gross-up” accounting treatment, under which an ACL is recognized for the estimated credit losses at the acquisition date and the loan values are recorded at their estimated fair values plus a gross-up to offset the ACL. The gross-up accounting treatment prevents double recognition of an ACL through credit loss expense that was already considered in the fair value measurement of acquired loans. Under the guidance in this update, the gross-up accounting treatment applies to all non-PCD loans (excluding credit cards) acquired in a business combination and all non-PCD loans (excluding credit cards) that were purchased at least 90 days after origination and for which the purchaser was not involved in the loan origination. This update is to be applied prospectively, and will be effective for Busey for annual and interim reporting periods beginning January 1, 2027. Early adoption is permitted. For future transactions, Busey will evaluate the effect this ASU may have on its financial position and results of operations.

In September 2025, the FASB issued ASU 2025-07 “Derivatives and Hedging (Topic 815) and Revenue from Contracts with Customers (Topic 606): Derivatives Scope Refinements and Scope Clarification for Share-Based Noncash Consideration from a Customer in a Revenue Contract,” to reduce diversity in the application of derivative accounting practices. This update provides a scope limitation on the definition of a derivative subject to derivative accounting under ASC Topic 815, Derivatives and Hedging, to exclude certain non-exchange-traded contracts with contingencies based on operations or activities specific to one of the parties to the contract. In addition, this update clarifies that share-based noncash consideration from a customer that is contingent on the satisfaction of performance obligations should not be recognized at contract inception as a derivative asset or an equity security, but rather should be accounted for under the guidance in ASC Topic 606, Revenue from Contracts with Customers, and that guidance in other topics does not apply to share-based noncash consideration from a customer for the transfer of goods or services unless or until the entity’s right to receive or retain the share-based noncash consideration is unconditional under ASC Topic 606. The amendments in this update may be applied on either a prospective or modified retrospective basis, and will be effective for Busey for annual and interim reporting periods beginning January 1, 2027. Early adoption is permitted. Busey is currently evaluating the effect this ASU may have on its financial position and results of operations.

In September 2025, the FASB issued ASU 2025-06 “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software,” changing the criteria for capitalizing software costs to the following: (1) a commitment has been made to fund the software project, and (2) it is probable the project will be competed and used to perform its intended function. Under this update, software development stages are no longer a consideration in the determination of which costs are capitalized. The amendments in this update may be adopted on a prospective, modified transition, or retrospective basis, and will be effective for Busey for annual and interim reporting periods beginning January 1, 2028. Early adoption is permitted. Busey is currently evaluating the effect this ASU may have on its financial position and results of operations.

In July 2025, the FASB issued ASU 2025-05 “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets,” providing a practical expedient which, if elected, permits an entity to assume that current conditions as of the balance sheet date will remain static for the remaining life of the assets, removing the requirement to consider reasonable, supportable forecasts. The amendments in this update are to be applied prospectively, and will be effective for Busey for annual and interim reporting periods beginning January 1, 2026. Early adoption is permitted. Busey does not expect adoption of this ASU to have a material impact its financial position and results of operations.

In November 2024, the FASB issued ASU 2024-04 “Debt—Debt with Conversion and Other Options (Subtopic 470-20): Induced Conversions of Convertible Debt Instruments” to clarify when certain settlements of convertible debt instruments should be accounted for as an induced conversion. The amendments in this update may be applied on either a prospective or retrospective basis and will be effective for Busey for annual and interim reporting periods beginning January 1, 2026. Because Busey does not currently have any convertible debt, the Company does not expect adoption of this ASU to have any impact on its financial position or results of operations.

In November 2024, the FASB issued ASU 2024-03 “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses” to require additional disclosures within the notes to the financial statements about certain expense items. Specifically, disaggregation of income statement captions that contain expenses within the following five categories is required: (1) purchases of inventory, (2) employee compensation, (3) depreciation, (4) intangible asset amortization, and (5) depreciation, depletion, and amortization (“DD&A”) costs recognized as part of oil- and gas-producing activities or other amounts of depletion expense. Further, this update requires disclosure of the total amount of selling expenses and the entity’s definition of selling expenses. This update provides a practical expedient for banks and bank holding companies to continue presenting salaries and employee benefits in conformity with SEC Rule 210.9-04 instead of requiring those entities to apply the employee compensation definition included in Subtopic 220-40. The amendments in this update may be applied on either a prospective or retrospective basis and will be effective for Busey beginning with the annual reporting period ending December 31, 2027, and interim reporting periods beginning January 1, 2028. Early adoption is permitted. Because this update relates only to disclosure, Busey does not expect adoption of this ASU to have any impact on its financial position or results of operations.

In October 2023, the FASB issued ASU 2023‑06 “Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative” which aligns certain GAAP disclosure requirements with the SEC’s disclosure requirements, in order to better facilitate comparisons between entities that are subject to the SEC’s existing disclosures with entities that were not previously subject to the SEC’s requirements. Amendments in this update should be applied prospectively, and the effective date for Busey for each amendment in this ASU will be the date on which the SEC removes the related disclosure from Regulation S‑X or Regulation S‑K. Early adoption is prohibited. If the SEC has not removed the related disclosures from Regulation S‑X or Regulation S‑K by June 30, 2027, the pending content of this update will be removed from the ASC and will not become effective for any entity. Busey does not expect adoption of this ASU to have a material impact on its financial position or results of operations.

Subsequent Events

Busey has evaluated subsequent events for potential recognition and/or disclosure through the date the Consolidated Financial Statements included in this Annual Report on Form 10‑K were issued. In January 2026 Busey’s Board of Directors approved redemption of the trust preferred securities issued by First Busey Statutory Trust II, with the goal of completing the redemption in June of 2026. Regulatory approval for this redemption was received in February 2026. In addition, Busey filed a Current Report on Form 8‑K on January 27, 2026, which included information regarding the departure of a named executive officer, and during the first quarter of 2026 expects to record related severance expenses according to Schedule 1 of the Separation Letter, which is filed as Exhibit 10.3 3 to this Annual Report. Other than these, there were no significant subsequent events for the year ended December 31, 2025, through the filing date of these Consolidated Financial Statements.

SIGNIFICANT ACCOUNTING POLICIES - Recently Issued Accounting Standards Not Yet Adopted (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Federal	$ 16,794	$ 11,200	$ 18,300
Other	4,100
Total income tax payments	$ 20,909	$ 12,907	$ 25,408

PORTFOLIO LOANS - Schedule of Loan Modifications for Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Payment Deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 11,493	$ 325
Payment Deferral \| Commercial loans \| C&I and other commercial
Financing Receivable, Modified [Line Items]
Amortized cost basis	10,554	325
Payment Deferral \| Commercial loans \| CRE
Financing Receivable, Modified [Line Items]
Amortized cost basis	939	0
Payment Deferral \| Commercial loans \| Real estate construction
Financing Receivable, Modified [Line Items]
Amortized cost basis	0	0
Term Extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	40,373	49,546
Term Extension \| Commercial loans \| C&I and other commercial
Financing Receivable, Modified [Line Items]
Amortized cost basis	22,851	26,175
Term Extension \| Commercial loans \| CRE
Financing Receivable, Modified [Line Items]
Amortized cost basis	1,502	18,147
Term Extension \| Commercial loans \| Real estate construction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 16,020	$ 5,224
Payment Deferral and Extended Maturity
Financing Receivable, Modified [Line Items]
% of total class of financing receivable	0.40%	0.60%
Payment Deferral and Extended Maturity \| Commercial loans \| C&I and other commercial
Financing Receivable, Modified [Line Items]
% of total class of financing receivable	0.80%	1.40%
Payment Deferral and Extended Maturity \| Commercial loans \| CRE
Financing Receivable, Modified [Line Items]
% of total class of financing receivable	0.00%	0.60%
Payment Deferral and Extended Maturity \| Commercial loans \| Real estate construction
Financing Receivable, Modified [Line Items]
% of total class of financing receivable	1.50%	1.40%

STOCK-BASED COMPENSATION - Schedule of Changes in, the Company's Stock Option Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Shares
Outstanding at beginning of year (in shares)	15,106
Outstanding at end of year (in shares)	15,106	15,106
Exercisable at end of year (in shares)	15,106
Weighted- Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 23.53
Outstanding at end of year (in dollars per share)	23.53	$ 23.53
Exercisable at end of year (in dollars per share)	$ 23.53
Weighted- Average Remaining Contractual Term
Weighted-average remaining contractual life, options outstanding	10 months 13 days	1 year 10 months 13 days
Weighted-average remaining contractual life, exercisable at end of year	10 months 13 days
Intrinsic value, options outstanding	$ 4	$ 1
Intrinsic value, exercisable at end of year	$ 4

GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Estimated Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Goodwill and other intangibles assets
2026	$ 16,756
2027	15,342
2028	13,887
2029	10,626
2030	9,322
Thereafter	31,516
Total estimated amortization expense	97,449	$ 32,280
Core deposit intangible
Goodwill and other intangibles assets
2026	15,277
2027	14,251
2028	13,184
2029	10,266
2030	9,160
Thereafter	31,498
Total estimated amortization expense	93,636	26,580
Customer relationship intangible
Goodwill and other intangibles assets
2026	1,479
2027	1,091
2028	703
2029	360
2030	162
Thereafter	18
Total estimated amortization expense	$ 3,813	$ 5,700

JUNIOR SUBORDINATED DEBT OWED TO UNCOLSOLIDATED TRUSTS	12 Months Ended
JUNIOR SUBORDINATED DEBT OWED TO UNCOLSOLIDATED TRUSTS	Dec. 31, 2025
Junior Subordinated Debt Owed to Unconsolidated Trusts
JUNIOR SUBORDINATED DEBT OWED TO UNCOLSOLIDATED TRUSTS	NOTE 11. JUNIOR SUBORDINATED DEBT OWED TO UNCONSOLIDATED TRUSTS Busey maintains statutory trusts for the sole purpose of issuing and servicing trust preferred securities and related trust common securities. Proceeds from such issuances were used by the trusts to purchase junior subordinated notes issued by Busey, which are the sole assets of each trust. Concurrent with the issuance of the trust preferred securities, Busey issued guarantees for the benefit of the holders of the trust preferred securities. Busey owns all of the common securities of each trust. The trust preferred securities issued by each trust rank equally with the common securities in right of payment, except that if an event of default under the indenture governing the notes has occurred and is continuing, the preferred securities will rank senior to the common securities in right of payment. Busey had $77.3 million and $74.8 million of junior subordinated debt owed to unconsolidated trusts at December 31, 2025, and 2024, respectively, maturing in 2033 through 2036. In connection with its acquisitions of Pulaski Financial Corp. in 2016, M&M in 2024, and CrossFirst in 2025 Busey has acquired similar statutory trusts and the fair value adjustment is being accreted over their weighted average remaining lives, with a balance of $2.9 million remaining to be accreted as of both December 31, 2025, and 2024. For regulatory capital purposes, current banking regulations allow for the inclusion in Tier 1 Capital of qualifying trust preferred securities issued prior to May 19, 2010, by bank holding companies with less than $15.0 billion of assets. With the completion of the CrossFirst acquisition on March 1, 2025, Busey surpassed the $15.0 billion asset threshold, and its trust preferred securities were relegated from Tier 1 Capital to Tier 2 Capital. Busey’s trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated notes at par value at the stated maturity date or upon redemption. Each trust’s ability to pay amounts due on the trust preferred securities is solely dependent upon Busey making payments on the related junior subordinated notes. Busey’s obligations under the junior subordinated notes and other relevant trust agreements, in aggregate, constitute a full and unconditional guarantee by Busey of each trust’s obligations under the trust preferred securities issued by each trust. Busey has the right to defer payment of interest on the notes, in which case the distributions on the trust preferred securities will also be deferred, for up to five years, but not beyond the stated maturity date. In January 2026 Busey’s Board of Directors approved the redemption of the trust preferred securities issued by First Busey Statutory Trust II. Approval for the redemption has been received from the Federal Reserve Bank. Busey expects to complete the redemption in June of 2026.

LEASES - Schedule of Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2025 USD ($)
Rents to be received
2026	$ 804
2027	515
2028	377
2029	197
2030	117
Thereafter	0
Total lease payments from operating leases	$ 2,010

PORTFOLIO LOANS - Schedule of Performance of Modified Loans (Details) $ in Thousands	Dec. 31, 2025 USD ($)
Financing Receivable, Modified [Line Items]
Non-accrual	$ 3,721
Current
Financing Receivable, Modified [Line Items]
Current	47,872
30-89 Days
Financing Receivable, Modified [Line Items]
Current	273
90+ Days
Financing Receivable, Modified [Line Items]
Current	0
Commercial loans \| C&I and other commercial
Financing Receivable, Modified [Line Items]
Non-accrual	3,721
Commercial loans \| C&I and other commercial \| Current
Financing Receivable, Modified [Line Items]
Current	29,684
Commercial loans \| C&I and other commercial \| 30-89 Days
Financing Receivable, Modified [Line Items]
Current	0
Commercial loans \| C&I and other commercial \| 90+ Days
Financing Receivable, Modified [Line Items]
Current	0
Commercial loans \| CRE
Financing Receivable, Modified [Line Items]
Non-accrual	0
Commercial loans \| CRE \| Current
Financing Receivable, Modified [Line Items]
Current	2,168
Commercial loans \| CRE \| 30-89 Days
Financing Receivable, Modified [Line Items]
Current	273
Commercial loans \| CRE \| 90+ Days
Financing Receivable, Modified [Line Items]
Current	0
Commercial loans \| Real estate construction
Financing Receivable, Modified [Line Items]
Non-accrual	0
Commercial loans \| Real estate construction \| Current
Financing Receivable, Modified [Line Items]
Current	16,020
Commercial loans \| Real estate construction \| 30-89 Days
Financing Receivable, Modified [Line Items]
Current	0
Commercial loans \| Real estate construction \| 90+ Days
Financing Receivable, Modified [Line Items]
Current	$ 0

OTHER REAL ESTATE OWNED AND OTHER REPOSSESSED ASSETS - Schedule of OREO and Other Repossessed Assets Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
OREO
Total OREO	$ 700	$ 63
Other repossessed assets	3,926	0
OREO and other repossessed assets	4,626	63	$ 125	$ 850
Commercial
OREO
Total OREO	95	0
Residential
OREO
Total OREO	$ 605	$ 63

SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Schedule of Estimated Useful Lives for Premises and Equipment

The estimated useful lives for premises and equipment are:


Asset Description						Estimated Useful Life
Buildings and improvements						3 — 40 years
Furniture and equipment						3 — 10 years

Schedule of Preferred Stock Issuances

The following table summarizes Busey’s preferred stock issuances as of December 31, 2025:



Title of Each Issue	Shares Authorized	Shares Issued	Shares Outstanding	Balance		Per Share Preference in Liquidation		Aggregate Liquidation Preference ($ in 000's)

Preferred stock, $0.001 par value:	1,000,000
Series A Non-Cumulative Perpetual Preferred Stock	7,750	7,750	7,750	$	7.75	$	1,000.00	$	7,750
8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock	230,000	215,000	215,000	$	215.00	$	1,000.00	$	215,000

Changes in preferred stock issued are presented in the following table:


	Years Ended December 31,
Title of Each Issue	2025		2024		2023


Series A Non-Cumulative Perpetual Preferred Stock	$	7.75	$	—	$	—
8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock	215.00		—		—

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

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+ Details

DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Cash pledged to secure obligations under derivative contracts \| Not Designated as Hedging Instrument
Derivative Financial Instruments
Variable rate, commercial loans that are supported by the interest rate swap contracts	$ 1,160,000	$ 719,200
Cash pledged to secure obligations under derivative contracts \| Cash Flow Hedging
Derivative Financial Instruments
Notional amount	500,000	500,000
Prime Loan Swap \| Designated as Hedging Instrument
Derivative Financial Instruments
Notional amount	300,000
Prime Loan Swap \| Cash Flow Hedging
Derivative Financial Instruments
Notional amount	300,000	300,000
SOFR Loan Swaps \| Designated as Hedging Instrument
Derivative Financial Instruments
Notional amount	200,000
SOFR Loan Swaps \| Cash Flow Hedging
Derivative Financial Instruments
Notional amount	$ 200,000	$ 200,000

STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2025

Share-Based Payment Arrangement [Abstract]

Schedule of Changes in, the Company's Stock Option Awards

Busey has outstanding stock options that were issued under the First Community 2016 Equity Incentive Plan and assumed in Busey’s 2017 acquisition of First Community. A summary of the status of, and changes in, Busey's stock option awards for the year ended December 31, 2025, follows:


Options	Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Intrinsic Value ($000's)
Outstanding at December 31, 2024	15,106	$	23.53	1.87 years	$	1



Outstanding at December 31, 2025	15,106	$	23.53	0.87 years	4

Exercisable at December 31, 2025	15,106	$	23.53	0.87 years	4

Schedule of Share-Based Payment Arrangement, Stock Appreciation Right, Activity

A summary of SSAR activity during 2025 is presented below:


SSARs	Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Intrinsic Value ($000's)
Outstanding at December 31, 2024	—	$	—	—	$	—
Replacement of CrossFirst SSARs	424,390	15.78
Exercised1	(119,842)	13.31
Forfeited	(4,005)	16.00
Expired	(30,145)	23.23
Outstanding at December 31, 2025	270,398	$	16.04	4.98 years	2,095

Exercisable at December 31, 2025	253,560	$	15.70	4.94 years	2,051

___________________________________________

1. The aggregate intrinsic value of SSARs exercised during 2025 was $1.1 million.

Schedule Of Share-Based Payment Award, Stock Appreciation Rights, Valuation Assumptions

The following table provides the range of assumptions used in the Monte Carlo simulations to value CrossFirst awards that were replaced at acquisition and the weighted average grant date fair value per share:


	Year Ended December 31, 2025
Assumptions
Expected volatility1	29.10% – 36.70%
Expected dividends2	4.17%
Simulation term3, 4, 5	4.20 years – 5.69 years
Risk-free rate6	3.97% – 4.03%
Weighted average grant date fair value per share	$	8.94

___________________________________________

1.Expected volatility was calculated using a historical volatility of Busey’s stock price over a period commensurate with the simulation term of the SSARs.

2.The dividend yield was calculated using Busey’s annual dividend and closing stock price on the date of acquisition.

3.The simulation term was commensurate with the midpoint of the longest expected term across all SSARs and was impacted by expected exercise behavior and termination rate.

4.As a component of determining the simulation term, exercise was assumed to occur at the earlier of the midpoint of i) the greater of the weighted average time to vest or the time the options are in the money, and the time the SSARs expire, ii) 90 days following the occurrence of a termination, or iii) the end of the contractual term.

5.As a component of determining the simulation term, termination rate was assumed to be between 25% and 50% in the first year following the acquisition and 5% for every year thereafter.

6.The risk-free rate for the simulation term of the SSARs was based on the continuously compounded semi-annual zero-coupon U.S. Treasury rates.

Schedule of Changes in the Company's RSU, PSU, and DSU Awards

A summary of changes in Busey’s RSU awards for the year ended December 31, 2025, is presented in the following table:


RSU Awards	Shares	Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2024	1,066,772	$	21.80
Conversion of Busey ROATCE PSUs to RSUs	157,094	23.99
Replacement of CrossFirst RSUs and PSUs	341,048	23.99
Granted	387,882	22.28
Dividend equivalents earned	63,864	22.32
Vested	(547,788)	20.77
Forfeited	(148,335)	22.48
Nonvested at December 31, 2025	1,320,537	$	23.14

A summary of changes in Busey’s PSU awards for the year ended December 31, 2025, is presented in the following table:


PSU Awards	Shares1	Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2024	372,042	$	21.15
Modifications based on CrossFirst acquisition2	(181,828)	20.43
Granted	407,723	20.99
Dividend equivalents earned	198	21.87
Vested	(21,792)	20.61
Forfeited	(50,842)	20.94

Nonvested at December 31, 2025	525,501	$	21.32

Vested and outstanding at December 31, 20253	13,455	$	20.44

___________________________________________

1.Shares for PSU awards represent target shares at grant date.

2.Modifications include PSUs that were converted to RSUs as well as balance adjustments related to the 2023 TSR PSUs and the 2024 TSR PSUs.

3.The performance and service periods for PSUs granted in 2023 ended on December 31, 2025, and these awards were considered vested under the 2020 Equity Plan at that time. Performance achievement was calculated in January 2026 and approved by Busey’s Compensation Committee on January 27, 2026. The achievement percentage for these awards was determined to be zero percent.

A summary of changes in Busey’s DSU awards for the year ended December 31, 2025, is presented in the following table:


DSU Awards	Shares	Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2024	36,893	$	23.40
Granted	39,846	22.16
Dividend equivalents earned	8,518	22.64
Vested	(44,039)	23.29

Nonvested at December 31, 2025	41,218	$	22.16

Vested and outstanding at December 31, 2025	146,076	$	23.01

Schedule of Stock-based Compensation Expense

Busey recognized compensation expense related to non-vested equity awards as summarized in the table below:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024		2023
Stock-based compensation expense

SSARs	Salaries, wages, and employee benefits	$	137	$	—	$	—
RSU awards	Salaries, wages, and employee benefits	10,657		3,823		2,622
PSU awards1	Salaries, wages, and employee benefits	5,158		2,867		2,962
DSU awards	Other expense	842		826		833
ESPP	Salaries, wages, and employee benefits	326		210		178
Total stock-based compensation expense		$	17,120	$	7,726	$	6,595

___________________________________________

1.Expense for PSU awards with a relative total stockholder return performance goal represents amounts based on target shares at the grant date. Expense for PSU awards with return on average tangible common equity and compounded annual revenue growth rate performance goals represents amounts based on target shares at the grant date, adjusted for performance expectations as of the date indicated.

Schedule of Unamortized Stock-based Compensation Expense

Unamortized stock-based compensation expense is presented in the table below:


	As of December 31,
(dollars in thousands)	2025		2024
Unamortized stock-based compensation
SSARs	$	98	$	—
RSU awards	9,236		7,093
PSU awards1	5,769		3,043
DSU awards	206		181
Total unamortized stock-based compensation	$	15,309	$	10,317

Weighted average period over which expense is to be recognized on awards issued under Busey's 2020 Equity Plan	1.8 years		2.5 years
Weighted average period over which expense is to be recognized on CrossFirst replacement awards	1.2 years		N/A

___________________________________________

1.Unamortized expense for PSU awards with a relative total stockholder return performance goal represents amounts based on target shares at grant date. Unamortized expense for PSU awards with return on average tangible common equity and compounded annual revenue growth rate performance goals represents amounts based on target shares at grant date, adjusted for performance expectations as of the date indicated.

PARENT COMPANY ONLY FINANCIAL INFORMATION

12 Months Ended

Dec. 31, 2025

Condensed Financial Information Disclosure [Abstract]

PARENT COMPANY ONLY FINANCIAL INFORMATION

NOTE 24. PARENT COMPANY ONLY FINANCIAL INFORMATION

Condensed financial data for First Busey Corporation is presented below.

CONDENSED BALANCE SHEETS


	As of December 31,
(dollars in thousands)	2025		2024
Assets
Cash and cash equivalents	$	126,764	$	73,484

Equity securities	14,761		10,295
Investments in subsidiaries:
Bank	2,483,450		1,584,264

Premises and equipment, net	1,590		11
Other assets	41,614		29,859
Total assets	$	2,668,179	$	1,697,913

Liabilities and stockholders' equity
Liabilities:



Subordinated notes, net of unamortized issuance costs	$	99,395	$	227,723
Junior subordinated debentures owed to unconsolidated trusts	77,328		74,815
Other liabilities	22,474		12,106
Total liabilities	199,197		314,644

Total stockholders' equity	2,468,982		1,383,269
Total liabilities and stockholders' equity	$	2,668,179	$	1,697,913

CONDENSED STATEMENTS OF INCOME


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Operating income
Dividends from subsidiaries:
Bank	$	160,000	$	100,000	$	90,000
Non-bank	—		—		900
Income from dissolution of non-bank subsidiary	—		—		733
Interest income	3,155		2,325		2,956
Gains (losses) recognized on equity securities, net	4,467		931		(2,171)
Other income	23,380		14,641		14,130
Total operating income	191,002		117,897		106,548

Expense
Salaries, wages, and employee benefits	42,963		21,129		17,766
Interest expense	14,193		17,944		19,005
Operating expense	18,094		11,238		8,009
Total expense	75,250		50,311		44,780

Income (loss) before income tax benefit and equity in undistributed (in excess of) net income of subsidiaries	115,752		67,586		61,768
Income tax benefit	6,748		7,480		7,310
Income (loss) before equity in undistributed (in excess of) net income of subsidiaries	122,500		75,066		69,078

Equity in undistributed (in excess of) net income of subsidiaries
Bank	12,762		38,625		53,487

Net income	$	135,262	$	113,691	$	122,565

CONDENSED STATEMENTS OF CASH FLOWS


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Cash flows provided by (used in) operating activities
Net income	$	135,262	$	113,691	$	122,565
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	1,029		1,163		1,038
Distributions more (less) than net income of subsidiaries	(12,762)		(38,625)		(53,487)
(Gains) losses recognized on equity securities, net	(4,467)		(931)		2,171
Stock-based compensation	17,120		7,726		6,595
(Increase) decrease in other assets	(157)		(8,848)		6,253
Increase (decrease) in other liabilities	(6,166)		365		(7,687)
Net cash provided by (used in) operating activities	129,859		74,541		77,448

Cash flows provided by (used in) investing activities
Sales (purchases) of equity securities, net	—		995		—
Net cash received in (paid for) acquisitions	11,832		(14,623)		—
Purchases of premises and equipment	(1,201)		(9)		—
Repayments of investments in subsidiaries	—		—		1,480
Net cash provided by (used in) investing activities	10,631		(13,637)		1,480

Cash flows provided by (used in) financing activities
Cash paid for withholding taxes on stock-based payments	(5,282)		(1,755)		(1,093)
Cash dividends paid	(90,989)		(54,169)		(53,076)
Repayments of borrowings	(129,000)		(31,450)		(12,000)

Proceeds from the exercise of stock options and warrants	(452)		(3)		9
Proceeds from issuance of treasury stock for the 2021 ESPP	1,845		—		—
Purchase of treasury stock	(69,859)		—		(4,482)
Issuance of preferred stock, net of stock issuance costs	207,447		—		—
Common stock issuance costs	(920)		(141)		—
Net cash provided (used in) by financing activities	(87,210)		(87,518)		(70,642)

Net increase (decrease) in cash and cash equivalents	53,280		(26,614)		8,286
Cash and cash equivalents, beginning of period	73,484		100,098		91,812

Cash and cash equivalents, ending of period	$	126,764	$	73,484	$	100,098

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Risk Participation Agreement (Details) $ in Thousands	Dec. 31, 2025 USD ($) agreement	Dec. 31, 2024 USD ($) agreement
Risk participation agreements purchased
Derivative Financial Instruments
Number of risk participation agreements \| agreement	12	5
Notional amount	$ 74,590	$ 40,092
Fair value	$ 30	$ 5
Risk participation agreements sold
Derivative Financial Instruments
Number of risk participation agreements \| agreement	13	0
Notional amount	$ 108,743	$ 0
Fair value	$ 65	$ 0

LEASES - Schedule of Lease-Related Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Right of use assets:
Operating leases	$ 30,204	$ 10,608
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Finance leases	$ 5,155	$ 0
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Premises and equipment, net	Premises and equipment, net
Total right of use assets	$ 35,359	$ 10,608
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Lease liabilities:
Operating leases	$ 32,597	$ 11,040
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Long-Term Debt	Other Long-Term Debt
Finance leases	$ 6,223	$ 0
Total lease liabilities	$ 38,820	$ 11,040
Weighted average remaining lease terms:
Operating leases	7 years 4 months 28 days	7 years 6 months 18 days
Finance leases	16 years 3 months 3 days
Weighted average discount rates:
Operating leases	4.24%	3.77%
Finance leases	5.10%

OTHER REAL ESTATE OWNED AND OTHER REPOSSESSED ASSETS

12 Months Ended

Dec. 31, 2025

Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]

OTHER REAL ESTATE OWNED AND OTHER REPOSSESSED ASSETS

NOTE 5. OTHER REAL ESTATE OWNED AND OTHER REPOSSESSED ASSETS

OREO and other repossessed assets represent properties and other assets acquired through foreclosure or other proceedings in settlement of loans and is included in other assets in the accompanying Consolidated Balance Sheets. The following table summarizes the composition of Busey’s OREO and other repossessed asset balances:


	As of December 31,
(dollars in thousands)	2025		2024
OREO
Commercial	$	95	$	—
Residential	605		63
Total OREO	700		63
Other repossessed assets	3,926		—
OREO and other repossessed assets	$	4,626	$	63

The following table summarizes changes in the OREO and other repossessed assets balance:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
OREO and other repossessed assets at January 1	$	63	$	125	$	850
Additions, transfers from loans and assumed in acquisitions	26,641		26		189
Sales	(21,233)		(84)		(770)
Cash payments (collected) paid	(423)		(4)		(44)
Impairment	(422)		—		(100)
OREO and other repossessed assets at December 31	$	4,626	$	63	$	125

Busey incurs operating expenses for, and may have income from, OREO and other repossessed assets. Upon sale, Busey may recognize a gain or loss on the sale of OREO and other repossessed assets. The table below summarizes the effect of these activities, included in other noninterest income and other noninterest expense on Busey’s Consolidated Statements of Income:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Income from (expense for) OREO and other repossessed assets
Operating income (expense), net	$	38	$	(17)	$	(67)
Net gain (loss) on sales	302		585		46
Impairment expense	(422)		—		(100)

Income from (expense for) OREO and other repossessed assets	$	(82)	$	568	$	(121)

Busey’s recorded investment in residential real estate loans that were in the process of foreclosure was $6.0 million as of December 31, 2025, and $0.4 million as of December 31, 2024. Busey follows Federal Housing Finance Agency guidelines on single-family foreclosures and real estate owned evictions on portfolio loans.

For additional information about Busey’s accounting policies related to OREO and other repossessed assets, see “Other Real Estate Owned and Other Repossessed Assets” in “Note 1. Significant Accounting Policies.”

PARENT COMPANY ONLY FINANCIAL INFORMATION (Tables)

12 Months Ended

Dec. 31, 2025

Condensed Financial Information Disclosure [Abstract]

Balance sheets

Condensed financial data for First Busey Corporation is presented below.

CONDENSED BALANCE SHEETS


	As of December 31,
(dollars in thousands)	2025		2024
Assets
Cash and cash equivalents	$	126,764	$	73,484

Equity securities	14,761		10,295
Investments in subsidiaries:
Bank	2,483,450		1,584,264

Premises and equipment, net	1,590		11
Other assets	41,614		29,859
Total assets	$	2,668,179	$	1,697,913

Liabilities and stockholders' equity
Liabilities:



Subordinated notes, net of unamortized issuance costs	$	99,395	$	227,723
Junior subordinated debentures owed to unconsolidated trusts	77,328		74,815
Other liabilities	22,474		12,106
Total liabilities	199,197		314,644

Total stockholders' equity	2,468,982		1,383,269
Total liabilities and stockholders' equity	$	2,668,179	$	1,697,913

Statements of income


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Operating income
Dividends from subsidiaries:
Bank	$	160,000	$	100,000	$	90,000
Non-bank	—		—		900
Income from dissolution of non-bank subsidiary	—		—		733
Interest income	3,155		2,325		2,956
Gains (losses) recognized on equity securities, net	4,467		931		(2,171)
Other income	23,380		14,641		14,130
Total operating income	191,002		117,897		106,548

Expense
Salaries, wages, and employee benefits	42,963		21,129		17,766
Interest expense	14,193		17,944		19,005
Operating expense	18,094		11,238		8,009
Total expense	75,250		50,311		44,780

Income (loss) before income tax benefit and equity in undistributed (in excess of) net income of subsidiaries	115,752		67,586		61,768
Income tax benefit	6,748		7,480		7,310
Income (loss) before equity in undistributed (in excess of) net income of subsidiaries	122,500		75,066		69,078

Equity in undistributed (in excess of) net income of subsidiaries
Bank	12,762		38,625		53,487

Net income	$	135,262	$	113,691	$	122,565

Statements of cash flows


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Cash flows provided by (used in) operating activities
Net income	$	135,262	$	113,691	$	122,565
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	1,029		1,163		1,038
Distributions more (less) than net income of subsidiaries	(12,762)		(38,625)		(53,487)
(Gains) losses recognized on equity securities, net	(4,467)		(931)		2,171
Stock-based compensation	17,120		7,726		6,595
(Increase) decrease in other assets	(157)		(8,848)		6,253
Increase (decrease) in other liabilities	(6,166)		365		(7,687)
Net cash provided by (used in) operating activities	129,859		74,541		77,448

Cash flows provided by (used in) investing activities
Sales (purchases) of equity securities, net	—		995		—
Net cash received in (paid for) acquisitions	11,832		(14,623)		—
Purchases of premises and equipment	(1,201)		(9)		—
Repayments of investments in subsidiaries	—		—		1,480
Net cash provided by (used in) investing activities	10,631		(13,637)		1,480

Cash flows provided by (used in) financing activities
Cash paid for withholding taxes on stock-based payments	(5,282)		(1,755)		(1,093)
Cash dividends paid	(90,989)		(54,169)		(53,076)
Repayments of borrowings	(129,000)		(31,450)		(12,000)

Proceeds from the exercise of stock options and warrants	(452)		(3)		9
Proceeds from issuance of treasury stock for the 2021 ESPP	1,845		—		—
Purchase of treasury stock	(69,859)		—		(4,482)
Issuance of preferred stock, net of stock issuance costs	207,447		—		—
Common stock issuance costs	(920)		(141)		—
Net cash provided (used in) by financing activities	(87,210)		(87,518)		(70,642)

Net increase (decrease) in cash and cash equivalents	53,280		(26,614)		8,286
Cash and cash equivalents, beginning of period	73,484		100,098		91,812

Cash and cash equivalents, ending of period	$	126,764	$	73,484	$	100,098

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Carrying Amount of Goodwill by Operating Segment

The carrying amount of goodwill by operating segment is presented in the table below:


	As of December 31,
(dollars in thousands)	2025		2024
Goodwill
Banking	$	360,180	$	310,595
Wealth Management	14,108		14,108
FirsTech	8,992		8,992
Total goodwill	$	383,280	$	333,695

Schedule of Other Intangible Asset Disclosures

The following table present Busey’s intangible asset balances and the related amounts of accumulated amortization:


	As of December 31, 2025
(dollars in thousands)	Core deposit intangible		Customer relationship intangible		Total
Intangible Assets
Intangible assets, gross	$	187,194	$	33,138	$	220,332
Accumulated amortization	93,558		29,325		122,883
Intangible assets, net	$	93,636	$	3,813	$	97,449


	As of December 31, 2024
(dollars in thousands)	Core deposit intangible		Customer relationship intangible		Total
Intangible Assets
Intangible assets, gross	$	105,411	$	33,138	$	138,549
Accumulated amortization	78,831		27,438		106,269
Intangible assets, net	$	26,580	$	5,700	$	32,280

Schedule of Amortization Expense Relating to Intangible Assets

Amortization expense related to intangible assets, as reflected on Busey's Consolidated Statements of Income, is presented in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Amortization Expense
Core deposit intangible	$	14,727	$	7,739	$	7,616
Customer relationship intangible	1,887		2,318		2,816
Amortization of intangible assets	$	16,614	$	10,057	$	10,432

Schedule of Carrying Amount of Amortized Intangible Assets

Future expense for the amortization of intangible assets, as estimated, is summarized in the table below:


	As of December 31, 2025
(dollars in thousands)	Core deposit intangible		Customer relationship intangible		Total
Estimated amortization expense
2026	$	15,277	$	1,479	$	16,756
2027	14,251		1,091		15,342
2028	13,184		703		13,887
2029	10,266		360		10,626
2030	9,160		162		9,322
Thereafter	31,498		18		31,516
Total estimated amortization expense	$	93,636	$	3,813	$	97,449

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-2

+ Details

SIGNIFICANT ACCOUNTING POLICIES - Preferred Stock (Details) - $ / shares	May 20, 2025	Mar. 01, 2025	Dec. 31, 2025	Dec. 31, 2024
Share-based Compensation
Preferred stock, shares issued (in shares)			222,750	0
Preferred stock redemption price per share (in dollars per share)		$ 1,000
Preferred stock phares per depository share (in dollars per share)	$ 0.025
Series A Preferred Stock
Share-based Compensation
Preferred stock, shares issued (in shares)		7,750
Preferred stock, dividend rate		8.00%
Preferred stock, liquidation preference (in dollars per share)		$ 1,000
Preferred stock redemption price per share (in dollars per share)		$ 1,000
Depository Shares
Share-based Compensation
Preferred stock, liquidation preference (in dollars per share)	$ 25
Issuance of preferred stock, net of issuance costs (in shares)	8,600,000
Series B Preferred Stock
Share-based Compensation
Preferred stock, liquidation preference (in dollars per share)	$ 1,000
Preferred stock redemption price per share (in dollars per share)	$ 1,000

STOCK-BASED COMPENSATION - CrossFirst Acquisition (Details)		12 Months Ended
	Mar. 01, 2025 shares	Dec. 31, 2025 USD ($) awardHolders shares	Dec. 31, 2024 USD ($) awardHolders shares	Dec. 31, 2023 USD ($) awardHolders shares	Dec. 31, 2022 USD ($) awardHolders
Common
Share-based Compensation
Net issuance of treasury stock (in shares) \| shares		514,785	163,387	132,091
CrossFirst Acquisition
Share-based Compensation
Net issuance of treasury stock (in shares) \| shares		108,021
PSU awards \| CrossFirst Acquisition
Share-based Compensation
Target level of performance percentage			75.00%	100.00%
Award holders \| awardHolders			129	108
Incremental cost \| $			$ 100,000	$ 200,000
TSR PSU Awards \| CrossFirst Acquisition
Share-based Compensation
Target level of performance percentage			76.90%	96.20%	94.50%
Award holders \| awardHolders			129	108	107
Incremental cost \| $			$ 800,000	$ 1,400,000	$ 1,300,000
RSU awards \| CrossFirst Acquisition
Share-based Compensation
Award holders \| awardHolders		139
Incremental cost \| $		$ 0
SSARs \| CrossFirst \| Common \| CrossFirst
Share-based Compensation
Shares received for each share owned (in shares) \| shares	0.6675

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Mortgage Banking Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Interest rate lock commitments
Mortgage banking derivative assets
Derivative asset, statement of financial position [Extensible Enumeration]	Other assets	Other assets
Notional Amount	$ 6,159	$ 2,430
Fair value recorded in other assets	$ 145	$ 28
Mortgage banking derivative liabilities
Derivative liability, statement of financial position [Extensible Enumeration]	Other liabilities	Other liabilities
Notional Amount	$ 0	$ 436
Fair value recorded in other liabilities	0	4
Forward sales commitments
Mortgage banking derivative assets
Notional Amount	1,520	3,457
Fair value recorded in other assets	2	21
Mortgage banking derivative liabilities
Notional Amount	9,278	1,955
Fair value recorded in other liabilities	26	6
Mortgage banking derivative assets \| Designated as Hedging Instrument
Mortgage banking derivative assets
Notional Amount	7,679	5,887
Fair value recorded in other assets	147	49
Mortgage banking derivative liabilities
Notional Amount	9,278	2,391
Fair value recorded in other liabilities	$ 26	$ 10

LEASES - Schedule of Revenue Recorded in Connection with Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Rental income	$ 860	$ 820	$ 724

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Portfolio loans, allowance for credit losses	$ 174,023,000	$ 83,404,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, liquidation preference	$ 222,750,000	$ 0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares authorized (in shares)	200,000,000	100,000,000

PORTFOLIO LOANS - Schedule of Financial Instruments Owned and Pledged as Collateral (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged loans	$ 13,393,776	$ 7,613,683
Total pledged loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged loans	6,905,935	5,579,424
FHLB
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged loans	5,051,512	4,813,600
Federal Reserve Bank
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged loans	$ 1,854,423	$ 765,824

BUSINESS COMBINATIONS - Schedule of Pre-tax Acquisition Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Business Combination [Line Items]
Pre-tax acquisition expenses	$ 100,308	$ 6,901
M&M
Business Combination [Line Items]
Pre-tax acquisition expenses	108	3,038
CrossFirst
Business Combination [Line Items]
Pre-tax acquisition expenses	100,200	$ 3,863
Adjustment to the initial provision for unfunded commitments	$ 4,000

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

SIGNIFICANT ACCOUNTING POLICIES - Trust Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Assets under care	$ 15,660	$ 13,830

BUSINESS COMBINATIONS - Schedule of Estimated Acquisition-date Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 01, 2025	Apr. 01, 2024	Dec. 31, 2025	Dec. 31, 2024
Consideration paid
Goodwill			$ 383,280	$ 333,695
CrossFirst
Assets acquired
Cash and cash equivalents	$ 385,808
Securities	725,622
Portfolio loans, net of ACL	6,023,063
Premises and equipment	69,673
Other intangible assets	81,783
Other assets	212,440
Total assets acquired	7,498,389
Liabilities assumed
Deposits	6,571,699
Short-term borrowings	11,148
Long-term borrowings	68,922
Subordinated notes, net of unamortized issuance costs	0
Junior subordinated debt owed to unconsolidated trusts	2,238
Other liabilities	84,912
Total liabilities assumed	6,738,919
Net assets acquired	759,470
Consideration paid
Cash	4
Total consideration paid	808,980
Goodwill	$ 49,510	$ 15,900
Useful life	10 years
CrossFirst \| Common stock
Consideration paid
Common stock, Preferred stock and Replacement awards	$ 795,227
CrossFirst \| Preferred stock
Consideration paid
Common stock, Preferred stock and Replacement awards	7,750
CrossFirst \| Replacement awards
Consideration paid
Common stock, Preferred stock and Replacement awards	$ 5,999
M&M
Assets acquired
Cash and cash equivalents		33,577
Securities		8,086
Portfolio loans, net of ACL		417,230
Premises and equipment		2,045
Other intangible assets		6,346
Other assets		10,461
Total assets acquired		477,745
Liabilities assumed
Deposits		392,838
Short-term borrowings		35,932
Long-term borrowings		1,450
Subordinated notes, net of unamortized issuance costs		3,911
Junior subordinated debt owed to unconsolidated trusts		2,594
Other liabilities		7,342
Total liabilities assumed		444,067
Net assets acquired		33,678
Consideration paid
Cash		15,200
Total consideration paid		49,575
Goodwill		$ 15,897
Useful life		10 years
M&M \| Common stock
Consideration paid
Common stock, Preferred stock and Replacement awards		$ 34,375
M&M \| Preferred stock
Consideration paid
Common stock, Preferred stock and Replacement awards		0
M&M \| Replacement awards
Consideration paid
Common stock, Preferred stock and Replacement awards		$ 0

OPERATING SEGMENTS AND RELATED INFORMATION - Schedule of Goodwill and Total Assets of Segments (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Goodwill	$ 383,280	$ 333,695
Total assets	18,104,736	12,046,722
Banking
Segment Reporting Information [Line Items]
Goodwill	360,180	310,595
Wealth Management
Segment Reporting Information [Line Items]
Goodwill	14,108	14,108
FirsTech
Segment Reporting Information [Line Items]
Goodwill	8,992	8,992
Operating Segments \| Banking
Segment Reporting Information [Line Items]
Goodwill	360,180	310,595
Total assets	17,880,797	11,856,651
Operating Segments \| Wealth Management
Segment Reporting Information [Line Items]
Goodwill	14,108	14,108
Total assets	152,422	126,180
Operating Segments \| FirsTech
Segment Reporting Information [Line Items]
Goodwill	8,992	8,992
Total assets	45,373	57,737
Other
Segment Reporting Information [Line Items]
Goodwill	0	0
Total assets	$ 26,144	$ 6,154

- Definition

Amount of asset recognized for present right to economic benefit.

+ References

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- Definition

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+ Details

LEASES (Tables)

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

Schedule of Lease-Related Balances

The following table summarizes lease-related balances that Busey reported on its Consolidated Balance Sheets:


		As of December 31,
(dollars in thousands)	Location	2025		2024
Lease balances
Right of use assets:
Operating leases	Other assets	$	30,204	$	10,608
Finance leases	Premises and equipment, net	5,155		—
Total right of use assets		$	35,359	$	10,608

Lease liabilities:
Operating leases	Other liabilities	$	32,597	$	11,040
Finance leases	Long-term borrowings	6,223		—
Total lease liabilities		$	38,820	$	11,040

Lease terms are summarized in the following table:


	As of December 31,
	2025		2024
Lease terms
Weighted average remaining lease terms:
Operating leases	7.41 years		7.55 years
Finance leases	16.26 years		N/A
Weighted average discount rates:
Operating leases	4.24	%	3.77	%
Finance leases	5.10	%	N/A

Schedule of Lease Costs and Other Lease Information

The following table presents lease costs that Busey reported on its Consolidated Statements of Income:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024		2023
Lease costs
Operating lease costs:
Premises rent expense	Net occupancy expense of premises	$	5,891	$	2,335	$	2,379
Equipment rent expense	Furniture and equipment expenses	29		17		16
Finance lease costs:
Amortization expense	Net occupancy expense of premises	269		—		—
Interest expense	Long-term borrowings	267		—		—
Variable lease costs	Net occupancy expense of premises	60		58		38
Short-term lease costs	Net occupancy expense of premises	58		83		50
Total lease cost		$	6,574	$	2,493	$	2,483

Cash paid for amounts included in the measurement of lease liabilities is presented in the following table:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Cash flows related to leases
Operating cash flows from operating leases	$	10,185	$	3,992	$	4,173
Operating cash flows from finance leases	267		—		—
Financing cash flows from finance leases	141		—		—

Right of use assets obtained in exchange for operating lease liabilities1	25,590		1,579		231
Right of use assets obtained in exchange for finance lease liabilities1	6,365		—		—

___________________________________________

Schedule of Future Undiscounted Lease Payments

Future undiscounted payments for leases with initial terms of one year or more are presented in the table below:


	As of December 31, 2025
(dollars in thousands)	Operating Leases		Finance Leases
Rent commitments

2026	$	6,255	$	490
2027	5,929		527
2028	5,406		540
2029	4,407		540
2030	3,505		540
Thereafter	12,690		6,625
Total undiscounted cash flows	38,192		9,262
Less: Amounts representing interest	5,595		3,039
Present value of net future minimum lease payments	$	32,597	$	6,223

Schedule of Revenue Recorded in Connection with Leases

Revenues recorded in connection with these leases, reported in other income on Busey’s Consolidated Statements of Income, are summarized in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Rental income	$	860	$	820	$	724

Schedule of Future Minimum Lease Payments to be Received

Busey is entitled to receive aggregate future minimum lease payments as shown in the table below:


(dollars in thousands)	As of December 31, 2025
Rents to be received

2026	$	804
2027	515
2028	377
2029	197
2030	117
Thereafter	—
Total lease payments from operating leases	$	2,010

PREMISES AND EQUIPMENT - Schedule of Premises and Equipment, net (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Premises and equipment
Premises and equipment, gross	$ 309,180	$ 226,695
Accumulated depreciation and amortization	(115,736)	(107,875)
Premises and equipment, net	193,444	118,820
Land and improvements
Premises and equipment
Premises and equipment, gross	50,147	42,565
Buildings and improvements
Premises and equipment
Premises and equipment, gross	194,925	130,185
Furniture and equipment
Premises and equipment
Premises and equipment, gross	$ 64,108	$ 53,945

PORTFOLIO LOANS (Tables)

12 Months Ended

Dec. 31, 2025

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Schedule of Distribution of Portfolio Loans

Distributions of the loan portfolio by loan category and lending activity is presented in the following table:


	As of December 31,
(dollars in thousands)	2025		2024
Commercial loans
C&I and other commercial	$	4,229,208	$	1,904,515
CRE	5,550,018		3,269,564
Real estate construction	1,039,289		378,209
Total commercial loans	10,818,515		5,552,288
Retail loans
Retail real estate	2,154,616		1,696,457
Retail other	594,668		448,342
Total retail loans	2,749,284		2,144,799

Total portfolio loans	13,567,799		7,697,087
ACL	(174,023)		(83,404)
Portfolio loans, net	$	13,393,776	$	7,613,683

Schedule of Financial Instruments Owned and Pledged as Collateral


	As of December 31,
(dollars in thousands)	2025		2024
Pledged loans
FHLB	$	5,051,512	$	4,813,600
Federal Reserve Bank	1,854,423		765,824
Total pledged loans	$	6,905,935	$	5,579,424

To secure its obligations under derivative contracts, Busey pledged cash and held collateral as follows:


	As of December 31,
(dollars in thousands)	2025		2024
Cash pledged to secure obligations under derivative contracts	$	14,400	$	21,900
Collateral held to secure obligations under derivative contracts	5,050		20,260

Schedule of Risk Grades Segregated by Category and Class of Portfolio Loans

The following table is a summary of Busey’s portfolio loans by risk grade:


	As of December 31, 2025
(dollars in thousands)	Pass		Watch		Special Mention		Substandard		Substandard Non-accrual		Total
Commercial loans
C&I and other commercial	$	3,567,589	$	375,113	$	176,814	$	75,394	$	34,298	$	4,229,208
CRE	4,607,134		769,405		140,967		24,680		7,832		5,550,018
Real estate construction	943,065		54,631		24,534		16,786		273		1,039,289
Total commercial loans	9,117,788		1,199,149		342,315		116,860		42,403		10,818,515
Retail loans
Retail real estate	2,106,215		30,674		7,507		1,799		8,421		2,154,616
Retail other	594,294		—		—		—		374		594,668
Total retail loans	2,700,509		30,674		7,507		1,799		8,795		2,749,284
Total portfolio loans	$	11,818,297	$	1,229,823	$	349,822	$	118,659	$	51,198	$	13,567,799


	As of December 31, 2024
(dollars in thousands)	Pass		Watch		Special Mention		Substandard		Substandard Non-accrual		Total
Commercial loans
C&I and other commercial	$	1,545,338	$	281,424	$	36,152	$	37,749	$	3,852	$	1,904,515
CRE	2,744,018		438,945		55,041		16,507		15,053		3,269,564
Real estate construction	345,908		26,833		221		5,224		23		378,209
Total commercial loans	4,635,264		747,202		91,414		59,480		18,928		5,552,288
Retail loans
Retail real estate	1,680,640		9,408		882		2,543		2,984		1,696,457
Retail other	448,166		—		—		—		176		448,342
Total retail loans	2,128,806		9,408		882		2,543		3,160		2,144,799
Total portfolio loans	$	6,764,070	$	756,610	$	92,296	$	62,023	$	22,088	$	7,697,087

Schedule of Risk Grades of Portfolio Loans, Further Sorted by Origination

Risk grades of portfolio loans and net charge-offs are presented in the tables below by lending activity, further sorted by origination year:


	As of and For The Year Ended December 31, 2025
Risk Grade Ratings	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans		Total
(dollars in thousands)	2025		2024		2023		2022		2021		Prior
C&I and other commercial
Pass	$	833,539	$	486,278	$	342,560	$	207,053	$	178,429	$	122,904	$	1,396,826	$	3,567,589
Watch	21,750		79,853		56,387		38,786		48,624		16,778		112,935		375,113
Special Mention	21,712		11,609		56,578		26,343		5,339		800		54,433		176,814
Substandard	8,336		605		20,444		14,603		9,868		3,655		17,883		75,394
Substandard non-accrual	1,489		3,899		600		10,265		948		4,560		12,537		34,298
Total C&I and other commercial	886,826		582,244		476,569		297,050		243,208		148,697		1,594,614		4,229,208
Gross charge-offs	$	4,667	$	3,332	$	4,347	$	1,450	$	13,591	$	11,456	$	5,716	$	44,559

CRE
Pass	1,077,169		483,950		710,448		1,035,426		740,680		515,631		43,830		4,607,134
Watch	210,673		61,926		119,986		143,072		161,387		69,789		2,572		769,405
Special Mention	49,648		22,642		2,991		13,811		32,109		18,858		908		140,967
Substandard	2,416		679		3,857		4,873		7,316		5,324		215		24,680
Substandard non-accrual	72		—		4,547		—		—		3,213		—		7,832
Total CRE	1,339,978		569,197		841,829		1,197,182		941,492		612,815		47,525		5,550,018
Gross charge-offs	1,297		11,057		—		—		253		—		—		12,607

Real estate construction
Pass	395,019		268,117		107,930		89,673		5,356		2,733		74,237		943,065
Watch	18,571		2,112		3,999		22,561		167		—		7,221		54,631
Special Mention	17,961		—		—		—		6,573		—		—		24,534
Substandard	16,020		—		—		—		766		—		—		16,786
Substandard non-accrual	—		273		—		—		—		—		—		273
Total real estate construction	447,571		270,502		111,929		112,234		12,862		2,733		81,458		1,039,289
Gross charge-offs	—		—		—		—		—		—		—		—

Retail real estate
Pass	93,212		127,475		269,877		446,309		407,851		508,504		252,987		2,106,215
Watch	2,686		569		24,601		1,492		267		482		577		30,674
Special Mention	47		78		4,028		1,454		1,686		—		214		7,507
Substandard	—		—		108		440		484		631		136		1,799
Substandard non-accrual	154		308		128		523		264		2,841		4,203		8,421
Total retail real estate	96,099		128,430		298,742		450,218		410,552		512,458		258,117		2,154,616
Gross charge-offs	1,164		—		—		—		—		51		36		1,251

Retail other
Pass	5,233		2,265		33,349		30,321		4,561		885		517,680		594,294



Substandard non-accrual	—		—		76		134		—		—		164		374
Total retail other	5,233		2,265		33,425		30,455		4,561		885		517,844		594,668
Gross charge-offs	546		147		270		47		—		74		141		1,225

Total portfolio loans	$	2,775,707	$	1,552,638	$	1,762,494	$	2,087,139	$	1,612,675	$	1,277,588	$	2,499,558	$	13,567,799
Total gross charge-offs	$	7,674	$	14,536	$	4,617	$	1,497	$	13,844	$	11,581	$	5,893	$	59,642


	As of and For The Year Ended December 31, 2024
Risk Grade Ratings	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans		Total
(dollars in thousands)	2024		2023		2022		2021		2020		Prior
C&I and other commercial
Pass	$	320,831	$	147,909	$	163,870	$	125,053	$	74,146	$	117,234	$	596,295	$	1,545,338
Watch	38,734		49,394		44,709		16,393		2,175		20,964		109,055		281,424
Special Mention	1,718		2,293		5,658		2,634		106		2,540		21,203		36,152
Substandard	15,186		6,545		788		591		320		2,424		11,895		37,749
Substandard non-accrual	65		141		464		—		42		852		2,288		3,852
Total C&I and other commercial	376,534		206,282		215,489		144,671		76,789		144,014		740,736		1,904,515
Gross charge-offs	$	—	$	14,980	$	148	$	22	$	—	$	303	$	—	$	15,453

CRE
Pass	291,503		354,591		755,266		645,994		356,867		314,340		25,457		2,744,018
Watch	115,078		132,900		60,611		62,408		28,320		38,733		895		438,945
Special Mention	39,252		643		8,020		1,395		4,165		1,517		49		55,041
Substandard	6,983		355		4,628		50		95		4,346		50		16,507
Substandard non-accrual	15,000		39		—		—		14		—		—		15,053
Total CRE	467,816		488,528		828,525		709,847		389,461		358,936		26,451		3,269,564
Gross charge-offs	—		—		—		2,999		—		315		—		3,314

Real estate construction
Pass	159,825		134,450		12,205		24,781		2,213		1,124		11,310		345,908
Watch	20,170		6,455		—		208		—		—		—		26,833
Special Mention	—		—		—		221		—		—		—		221
Substandard	5,224		—		—		—		—		—		—		5,224
Substandard non-accrual	—		—		—		23		—		—		—		23
Total real estate construction	185,219		140,905		12,205		25,233		2,213		1,124		11,310		378,209
Gross charge-offs	—		—		—		—		—		—		—		—

Retail real estate
Pass	101,582		237,306		366,820		354,380		147,236		267,431		205,885		1,680,640
Watch	1,255		550		2,733		3,377		872		124		497		9,408
Special Mention	151		—		344		—		—		372		15		882
Substandard	—		243		1,018		503		—		776		3		2,543
Substandard non-accrual	—		—		344		91		152		1,526		871		2,984
Total retail real estate	102,988		238,099		371,259		358,351		148,260		270,229		207,271		1,696,457
Gross charge-offs	—		—		—		—		—		168		—		168

Retail other
Pass	4,996		55,665		57,944		12,207		2,304		589		314,461		448,166



Substandard non-accrual	—		94		67		4		—		11		—		176
Total retail other	4,996		55,759		58,011		12,211		2,304		600		314,461		448,342
Gross charge-offs	9		31		106		78		4		403		—		631

Total portfolio loans	$	1,137,553	$	1,129,573	$	1,485,489	$	1,250,313	$	619,027	$	774,903	$	1,300,229	$	7,697,087
Total gross charge-offs	$	9	$	15,011	$	254	$	3,099	$	4	$	1,189	$	—	$	19,566

Schedule of Past Due and Non-accrual Loans and Non-Accrual Status

An analysis of portfolio loans that are past due and still accruing, or on non-accrual status, is presented in the table below:


	As of December 31, 2025
	Loans past due, still accruing						Non-accrual Loans		Non-accrual Loans with No Allowance for Credit Losses
(dollars in thousands)	30-59 Days		60-89 Days		90+Days
Commercial loans
C&I and other commercial	$	3,577	$	593	$	2,128	$	34,298	$	4,612
CRE	484		2,514		—		7,832		1,588
Real estate construction	—		—		—		273		158
Past due and non-accrual commercial loans	4,061		3,107		2,128		42,403		6,358
Retail loans
Retail real estate	2,457		4,280		136		8,421		349
Retail other	2,491		79		24		374		—
Past due and non-accrual retail loans	4,948		4,359		160		8,795		349
Total past due and non-accrual loans	$	9,009	$	7,466	$	2,288	$	51,198	$	6,707


	As of December 31, 2024
	Loans past due, still accruing						Non-accrual Loans		Non-accrual Loans with No Allowance for Credit Losses
(dollars in thousands)	30-59 Days		60-89 Days		90+Days
Commercial loans
C&I and other commercial	$	95	$	—	$	—	$	3,852	$	1,224
CRE	42		2,759		—		15,053		15,000
Real estate construction	41		—		—		23		—
Past due and non-accrual commercial loans	178		2,759		—		18,928		16,224
Retail loans
Retail real estate	3,280		683		1,115		2,984		194
Retail other	1,094		130		34		176		—
Past due and non-accrual retail loans	4,374		813		1,149		3,160		194
Total past due and non-accrual loans	$	4,552	$	3,572	$	1,149	$	22,088	$	16,418

Schedule of Loan Modifications for Borrowers Experiencing Financial Difficulty


	Year Ended December 31, 2025
(dollars in thousands)	Payment Deferral		Term Extension		% of Total Class of Financing Receivable
Modified Loans
C&I and other commercial	$	10,554	$	22,851	0.8	%
CRE1	939		1,502		—	%
Real estate construction	—		16,020		1.5	%


Total of loans modified during the period2	$	11,493	$	40,373	0.4	%

___________________________________________

1.Modified loans represented an insignificant portion of CRE loans, rounding to zero percent.

2.Modifications included four loans on non-accrual status, and the remaining loans were classified as substandard.


	Year Ended December 31, 2024
(dollars in thousands)	Payment Deferral		Term Extension		% of Total Class of Financing Receivable
Modified Loans
C&I and other commercial	$	325	$	26,175	1.4	%
CRE	—		18,147		0.6	%
Real estate construction	—		5,224		1.4	%


Total of loans modified during the period1	$	325	$	49,546	0.6	%

___________________________________________

1.Modifications included one loan on non-accrual status, and the remaining loans were classified as substandard.

Years Ended December 31,

2025

2024

2023

Weighted Average Term Extension

Weighted Average Interest Rate Reduction

Weighted Average Term Extension

Weighted Average Loan Term Extensions

C&I and other commercial

9 months

1.3 years

—

1.5 years

CRE

11 months

4 months

2.50

1.8 years

Real estate construction

10 months

6 months

—

1.0 year

Aggregate effect

10 months

2.50

1.4 years

The following table depicts the payment performance of loans modified during the last twelve months:


	As of December 31, 2025
(dollars in thousands)	Current		30-89 Days		90+ Days		Non-accrual
Modified Loans
C&I and other commercial	$	29,684	$	—	$	—	$	3,721
CRE	2,168		273		—		—
Real estate construction	16,020		—		—		—


Loans modified during the last twelve months	$	47,872	$	273	$	—	$	3,721

Schedule of Modified Loans with Subsequent Defaults


	Years Ended December 31,
	2025				2024			2023
(dollars in thousands)	Payment Deferral		Term Extension			Term Extension			Term Extension
Loans with Subsequent Defaults
C&I and other commercial	$	460	$	3,261		$	—		$	88
CRE	—		—			15,000			—



Modified loans with subsequent defaults	$	460	$	3,261		$	15,000		$	88

Schedule of Loans Evaluated Individually, Segregated by Loan Category and Class


(dollars in thousands)	C&I and Other Commercial		CRE		Real Estate Construction		Retail Real Estate		Retail Other		Total
ACL balance, December 31, 2022	$	23,860	$	38,299	$	6,457	$	18,193	$	4,799	$	91,608


Provision for loan losses	(727)		(2,455)		(1,465)		7,922		(876)		2,399
Charged-off	(2,429)		(953)		—		(407)		(629)		(4,418)
Recoveries	552		574		171		590		264		2,151
ACL balance, December 31, 2023	21,256		35,465		5,163		26,298		3,558		91,740
Day 1 PCD1	824		322		—		96		1		1,243
Provision for loan losses	14,455		(318)		(1,885)		(3,031)		(631)		8,590
Charged-off	(15,453)		(3,314)		—		(168)		(631)		(19,566)
Recoveries	507		146		67		516		161		1,397
ACL balance, December 31, 2024	21,589		32,301		3,345		23,711		2,458		83,404
Day 1 PCD1	75,569		21,588		2,112		1,430		84		100,783
Day 2 Provision for loan losses2	22,648		15,104		2,911		1,628		142		42,433
Provision for loan losses	(16,574)		13,677		3,105		3,159		(54)		3,313
Charged-off3	(44,559)		(12,607)		—		(1,251)		(1,225)		(59,642)
Recoveries	2,697		265		95		501		174		3,732
ACL balance, December 31, 2025	$	61,370	$	70,328	$	11,568	$	29,178	$	1,579	$	174,023

__________________________________________

1.The Day 1 PCD was attributable to the M&M acquisition in 2024 and the CrossFirst acquisition in 2025.

2.The Day 2 Provision for loan losses was attributable to the CrossFirst acquisition.

3.Charge-off amounts included $36.8 million for PCD loans assumed in the CrossFirst acquisition.

FAIR VALUE MEASUREMENTS - Schedule of Activity for Financial Assets Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring - Level 3 Inputs - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 5	$ 15
Gains (losses) recognized in earnings	117	(26)
Purchases	(171)	16
Sales	55	0
Assumed in acquisition	(41)	0
Ending Balance	$ (35)	$ 5
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other noninterest expense	Other noninterest expense

EMPLOYEE BENEFIT PLANS - Narrative (Details)	12 Months Ended
EMPLOYEE BENEFIT PLANS - Narrative (Details)	Dec. 31, 2025
Employee Benefit Plans
Employer matching contribution, percent of match	100.00%
Employer matching contribution, percent of employees' gross pay	3.00%
Employer matching contribution, percent of next match	50.00%
Employer next matching contribution, percent of employees' gross pay	2.00%
Vesting period	5 years

EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2025

Employee Benefit Plans

Schedule of Expenses Related to the Employee Benefit Plans

Expenses related to Busey’s employee benefit plans, reported in salaries, wages, and employee benefits in the accompanying Consolidated Statements of Income, are summarized in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
401(k) Plan expenses
Safe harbor match expenses	$	6,261	$	4,486	$	3,745
Profit-sharing expenses	4,914		3,370		3,031
Total 401(k) Plan expenses	$	11,175	$	7,856	$	6,776

SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Organization and Nature of Operations

Use of Estimates

Trust Assets

Cash and Cash Equivalents

Business Combinations

Investment Securities

Debt Securities Available for Sale

Busey considers the following factors in assessing whether the decline is due to a credit loss:

•Extent to which the fair value is less than the amortized cost basis;

•Payment structure of the debt security and the likelihood of the issuer being able to make payments that increase in the future;

•Failure of the issuer of the security to make scheduled interest or principal payments; and

•Any changes to the rating of the security by a rating agency.

Debt Securities Held to Maturity

Equity Securities

Equity securities are carried at fair value with changes in fair value recognized in earnings.

Loans Held for Sale

Loans held for sale include mortgage loans which Busey intends to sell to investors and/or the secondary mortgage market.

Loan Servicing

Servicing fee income is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal and are recorded as income when earned.

Portfolio Loans

Loan Modifications

Allowance for Credit Losses and Assets Purchased with Credit Deterioration

Allowance for Credit Losses

Assets Purchased with Credit Deterioration

For all other loans, an ACL is established immediately after the acquisition through a charge to the provision for credit losses.

Other Real Estate Owned and Other Repossessed Assets

Long-Lived Assets

Premises and Equipment


Asset Description						Estimated Useful Life
Buildings and improvements						3 — 40 years
Furniture and equipment						3 — 10 years

Premises and equipment are reviewed for impairment in accordance with Busey’s policies regarding long-lived assets.

Leases

Right of use assets are reviewed for impairment in accordance with Busey’s policies regarding long-lived assets.

Operating Leases

Finance Leases

Busey had one finance lease as of December 31, 2025, which was acquired through its acquisition of CrossFirst.

Short-term Leases

Goodwill and Other Intangibles

Cash Surrender Value of Bank-Owned Life Insurance

Cash Surrender Value of Bank Owned Life Insurance

Restricted Bank Stock

In connection with the CrossFirst acquisition, Busey acquired Bankers’ Bank of the West Bancorp, Inc. bank stock and has an immaterial amount as of December 31, 2025.

Transfers of Financial Assets

Income Taxes and Tax Credit and Other Investments in Unconsolidated Entities

Income Taxes

Tax Credit Investments and Other Investments in Unconsolidated Entities

Stock-Based Compensation

Stock Options

Busey has outstanding stock options assumed from acquisitions. All stock options that remained outstanding as of December 31, 2025, were fully vested.

Stock-Settled Appreciation Rights

Busey assumed SSARs in connection with the CrossFirst acquisition. The fair value of each SSAR was estimated at the acquisition date using a Monte Carlo simulation.

2020 Equity Plan

All of Busey’s employees and directors and those of its subsidiaries are eligible to receive awards under the plans.

RSU Awards

PSU Awards

DSU Awards

Employee Stock Purchase Plan

Treasury Stock

Off-Balance Sheet Arrangements

Derivative Financial Instruments

Interest Rate Swaps Designated as Cash Flow Hedges

Interest Rate Swaps Not Designated as Hedges

Interest Rate Lock Commitments

Forward Sales Commitments

Risk Participation Agreements

To manage the credit risk exposure related to customer-facing swaps, Busey entered into risk participation agreements in conjunction with loan participation arrangements with other financial institutions. These agreements transfer credit risk related to an interest rate swap between Busey and another financial institution. Risk participation agreements that Busey has entered into are structured as follows:

Fair Value of Financial Instruments

Comprehensive Income

Operating Segments

Revenue

Wealth Management Fees

Payment Technology Solutions

Treasury Management Services, Card Services and ATM Fees, and Other Service Charges on Deposit Accounts

Reclassifications

Impact of Recently Adopted Accounting Standards and Recently Issued Accounting Standards Not Yet Adopted

Impact of Recently Adopted Accounting Standards

Recently Issued Accounting Standards Not Yet Adopted

Subsequent Events

DEBT SECURITIES - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Total pledged loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Debt securities, carrying amount	$ 744.2	$ 871.4

DERIVATIVE FINANCIAL INSTRUMENTS

12 Months Ended

Dec. 31, 2025

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE FINANCIAL INSTRUMENTS

NOTE 19. DERIVATIVE FINANCIAL INSTRUMENTS

Busey utilizes interest rate swap agreements as part of its asset liability management strategy to help manage its interest rate risk position. Additionally, Busey enters into derivative financial instruments, including interest rate lock commitments issued to residential loan customers for loans that will be held for sale; forward sales commitments to sell residential mortgage loans to investors; and interest rate swaps and risk participation agreements with customers and other third parties. See “Note 20. Fair Value Measurements” for further discussion of the fair value measurement of such derivatives.

To secure its obligations under derivative contracts, Busey pledged cash and held collateral as follows:


	As of December 31,
(dollars in thousands)	2025		2024
Cash pledged to secure obligations under derivative contracts	$	14,400	$	21,900
Collateral held to secure obligations under derivative contracts	5,050		20,260

Derivative Instruments Designated as Hedges

Busey entered into derivative instruments designated as cash flow hedges. For a derivative instrument that is designated and qualifies as a cash flow hedge, the change in fair value of the derivative instrument is reported as a component of OCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Changes in fair value of components excluded from the assessment of effectiveness are recognized in current earnings.

Interest Rate Swaps Designated as Cash Flow Hedges

Interest rate swaps with notional amounts totaling $500.0 million as of both December 31, 2025, and December 31, 2024, were designated as cash flow hedges. Busey entered into a $300.0 million receive-fixed pay-floating interest rate swap to reduce Busey's asset sensitivity (“Prime Loan Swap”). Duration was added to Busey’s loan portfolio by fixing a portion of floating prime-based loans. Interest rates had risen above their historical lows allowing Busey to lock in a portion of its loan portfolio to reduce asset sensitivity while creating a more stable margin in a volatile rate market. These hedges were determined to be highly effective during the period, and Busey expects its hedges to remain highly effective during the remaining terms of the swaps. Further, Busey entered into forward-starting SOFR-based receive-fixed pay-floating interest rate swaps totaling $200.0 million to reduce Busey’s asset sensitivity (“SOFR Loan Swaps”). These hedges were determined to be highly effective during the period, and Busey expects its hedges to remain highly effective during the remaining terms of the swaps. Changes in fair value were recorded net of tax in OCI.

A summary of the interest-rate swaps designated as cash flow hedges is presented below:


		As of December 31,
(dollars in thousands)	Location	2025			2024
Prime Loan Swap
Notional amount		$	300,000		$	300,000
Weighted average rate: receive-fixed		4.81		%	4.81		%
Weighted average variable Prime pay rates		6.81		%	7.62		%
Weighted average maturity		3.10 years			4.10 years

SOFR Loan Swaps
Notional amount		$	200,000		$	200,000
Weighted average rate: receive-fixed		3.78		%	3.78		%
Weighted average variable 1-month CME Term SOFR pay rates		3.82		%	—		%
Weighted average maturity		3.76 years			4.76 years

Gross aggregate fair value of the swaps
Gross aggregate fair value of swap assets	Other assets	$	3,215		$	—
Gross aggregate fair value of swap liabilities	Other liabilities	$	14,589		$	27,770

Balances carried in AOCI
Unrealized gains (losses) on cash flow hedges, net of tax	AOCI	$	(7,616)		$	(19,805)

During the next 12 months, Busey expects to reclassify unrealized gains and losses from OCI to interest income and interest expense as shown in the following table. Amounts actually recognized could differ from these expectations due to changes in interest rates, hedge de-designations, and the addition of other hedges subsequent to December 31, 2025.


(dollars in thousands)	As of December 31, 2025

Unrealized gains (losses) expected to be reclassified from OCI to interest income	$	(521)

Interest income and interest expense recorded on swap transactions is presented in the following table:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Interest on swap transactions
Increase (decrease) in interest income on swap transactions	$	(8,432)	$	(10,669)	$	(10,326)
(Increase) decrease in interest expense on swap transactions	—		1,378		1,757
Net increase (decrease) in net interest income on swap transactions	$	(8,432)	$	(9,291)	$	(8,569)

Net gains (losses) relating to cash flow derivative instruments that were recorded in OCI on the Consolidated Statements of Income are presented in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Unrealized gains (losses) on cash flow hedges
Net gain (loss) recognized in OCI, net of tax	$	5,919	$	(10,790)	$	(1,835)
(Gain) loss reclassified from OCI to interest income, net of tax	6,270		8,818		7,382
(Gain) loss reclassified from OCI to interest expense, net of tax	—		(1,139)		(1,256)
Net change in unrealized gains (losses) on cash flow hedges, net of tax	$	12,189	$	(3,111)	$	4,291

Derivative Instruments Not Designated as Hedges

Interest Rate Swaps Not Designated as Hedges

Busey may offer derivative contracts to its customers in connection with their risk management needs. Busey manages the risk associated with these contracts by entering into equal and offsetting derivative agreements with a third-party dealer. These contracts supported variable rate, commercial loan relationships totaling $1.16 billion as of December 31, 2025, and $719.2 million as of December 31, 2024. These derivatives generally worked together as an economic interest rate hedge, but Busey did not designate them for hedge accounting treatment. Consequently, changes in fair value of the corresponding derivative financial asset or liability were recorded as either a charge or credit to current earnings during the period in which the changes occurred.

Amounts and fair values of derivative assets and derivative liabilities related to customer interest rate swaps recorded on the Consolidated Balance Sheets are summarized as follows:


		As of December 31, 2025				As of December 31, 2024
(dollars in thousands)	Location	Notional Amount		Fair Value		Notional Amount		Fair Value
Derivative assets not designated as hedging instruments
Interest rate swaps: receive-fixed, pay-floating	Other assets	$	703,286	$	11,542	$	156,539	$	1,465
Interest rate swaps: receive-floating, pay-fixed	Other assets	456,973		15,998		562,697		28,854
Derivative assets not designated as hedging instruments		$	1,160,259	$	27,540	$	719,236	$	30,319

Derivative liabilities not designated as hedging instruments
Interest rate swaps: receive-fixed, pay-floating	Other liabilities	$	456,973	$	15,998	$	562,697	$	28,854
Interest rate swaps: receive-floating, pay-fixed	Other liabilities	703,286		11,542		156,539		1,465
Derivative liabilities not designated as hedging instruments		$	1,160,259	$	27,540	$	719,236	$	30,319

Changes in fair value of these derivative assets and derivative liabilities were recorded in noninterest expense on the Consolidated Statements of Income and are summarized as follows:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024		2023
Interest rate swaps
Receive-fixed, pay-floating	Noninterest expense	$	(2,604)	$	1,726	$	(11,525)
Receive-floating, pay-fixed	Noninterest expense	2,604		(1,726)		11,525
Net change in fair value of interest rate swaps		$	—	$	—	$	—

Risk Participation Agreements

To manage the credit risk exposure related to customer-facing swaps, Busey entered into risk participation agreements in conjunction with loan participation arrangements with other financial institutions. Under these risk participation agreements, Busey purchased credit risk participation, paying an up-front fee to a counterparty to accept a portion of its credit exposure, and will receive a payment from the counterparty if the swap customer defaults on its obligations. Busey also assumed additional risk participation agreements entered into by CrossFirst, in which CrossFirst purchased credit risk participation, and Busey will receive a payment from the counterparty if the swap customer defaults on its obligations.

In connection with the CrossFirst acquisition, Busey assumed risk participation agreements entered into by CrossFirst, under which CrossFirst sold credit risk participation, receiving an up-front fee from a counterparty in exchange for accepting a portion of the counterparty’s credit exposure. Under these agreements, Busey will be required to make a payment to the counterparty if the swap customer defaults on its obligations.

Notional amounts of the risk participation agreements reflect the participating banks’ pro-rata shares of the derivative instruments, consistent with their shares of the related participated loans. The risk participation agreements mature between May 2026 and October 2033, and are summarized as follows:


	As of December 31,
(dollars in thousands)	2025		2024
Risk participation agreements purchased
Number of risk participation agreements	12		5
Notional amount	$	74,590	$	40,092
Fair value	30		5

Risk participation agreements sold
Number of risk participation agreements	13		—
Notional amount	$	108,743	$	—
Fair value	65		—

Mortgage Banking Derivatives

Interest Rate Lock Commitments

Interest rate lock commitments that meet the definition of derivative financial instruments under ASC Topic 815 “Derivatives and Hedging” are carried at their fair values in other assets or other liabilities on the Consolidated Balance Sheets, with changes in the fair values of the corresponding derivative financial assets or liabilities recorded as either a charge or credit to current earnings during the period in which the changes occurred.

Forward Sales Commitments

Busey economically hedges mortgage loans held for sale and interest rate lock commitments issued to its residential loan customers related to loans that will be held for sale by obtaining corresponding forward sales commitments with an investor to sell the loans at an agreed-upon price at the time the interest rate locks are issued to the customers. Forward sales commitments that meet the definition of derivative financial instruments under ASC Topic 815 “Derivatives and Hedging” are carried at their fair values in other assets or other liabilities on the Consolidated Balance Sheets. While such forward sales commitments generally served as an economic hedge to mortgage loans held for sale and interest rate lock commitments, Busey did not designate them for hedge accounting treatment. Changes in fair value of the corresponding derivative financial asset or liability were recorded as either a charge or credit to current earnings during the period in which the changes occurred.

Amounts and fair values of mortgage banking derivatives included on the Consolidated Balance Sheets are summarized as follows:


		As of December 31, 2025				As of December 31, 2024
(dollars in thousands)	Location	Notional Amount		Fair Value		Notional Amount		Fair Value
Mortgage banking derivative assets
Interest rate lock commitments	Other assets	$	6,159	$	145	$	2,430	$	28
Forward sales commitments	Other assets	1,520		2		3,457		21
Mortgage banking derivative assets		$	7,679	$	147	$	5,887	$	49

Mortgage banking derivative liabilities
Interest rate lock commitments	Other liabilities	$	—	$	—	$	436	$	4
Forward sales commitments	Other liabilities	9,278		26		1,955		6
Mortgage banking derivative liabilities		$	9,278	$	26	$	2,391	$	10

Gains and losses relating to these derivative instruments are reported in noninterest income, and are summarized as follows:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024		2023
Net gains (losses) on mortgage banking derivatives
Gains (losses) on interest rate lock commitments	Mortgage revenue	$	789	$	585	$	—
Gains (losses) on forward sales commitments	Mortgage revenue	(40)		(147)		2
Net gains (losses) on mortgage banking derivatives		$	749	$	438	$	2

Gains or losses are recognized on these mortgage banking derivative instruments in earnings; however, because loans held for sale are carried at LOCOM, any corresponding increase in the fair value of loans held for sale will not be recognized in earnings until the loans are sold, at which time the increase is factored into the calculated gain on sale. Decreases in the market value of loans held for sale are recognized in earnings at each measurement period.

For additional information about Busey’s accounting policies related to derivative financial instruments, see “Derivative Financial Instruments” in “Note 1. Significant Accounting Policies.”

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details

TRANSACTIONS WITH RELATED PARTIES - Schedule of the Analysis of the Changes in Loans to Related Parties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Analysis of the changes in loans to related parties
Balance at beginning of year	$ 98,011
Change in relationship	(62,108)
New loans/advances	2,383
Repayments	(3,373)
Balance at end of year	34,913
Directors and executive officers
Analysis of the changes in loans to related parties
Unused commitments to directors and executive officers	$ 35,863

BORROWINGS - Subordinate Notes (Details) - Subordinated Debt - USD ($) $ in Millions	Dec. 04, 2025	Apr. 01, 2024	Jun. 02, 2022	Jun. 01, 2020
5.25% notes maturing June 1, 2030
Junior subordinated debt owed to unconsolidated trusts
Principal balance				$ 125.0
Interest rate				5.25%
Duration of fixed interest rate				5 years
Floating interest rate margin				5.11%
5.000% notes maturing June 15, 2032
Junior subordinated debt owed to unconsolidated trusts
Principal balance			$ 100.0
Interest rate			5.00%
Floating interest rate margin			2.52%
Percentage of principal amount of notes			100.00%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			Secured Overnight Financing Rate (SOFR) [Member]
5.25% Notes Maturing December 4, 2030
Junior subordinated debt owed to unconsolidated trusts
Amount of principal redeemed	$ 4.0
5.25% Notes Maturing December 4, 2030 \| M&M
Junior subordinated debt owed to unconsolidated trusts
Principal balance		$ 4.0
Floating interest rate margin		4.97%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]		Secured Overnight Financing Rate (SOFR) [Member]
Fixed to floating interest rate		5.25%

PARENT COMPANY ONLY FINANCIAL INFORMATION - Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Dividends from subsidiaries:
Other income	$ 20,462	$ 14,001	$ 9,248
Total operating income	719,584	462,293	441,835
Expense
Salaries, wages, and employee benefits	289,063	175,619	162,597
Interest expense	324,251	201,070	159,922
Income tax benefit	(51,378)	(39,613)	(31,339)
Equity in undistributed (in excess of) net income of subsidiaries
Net income	135,262	113,691	122,565
Parent Company
Dividends from subsidiaries:
Bank	160,000	100,000	90,000
Non-bank	0	0	900
Income from dissolution of non-bank subsidiary	0	0	733
Interest income	3,155	2,325	2,956
Gains (losses) recognized on equity securities, net	4,467	931	(2,171)
Other income	23,380	14,641	14,130
Total operating income	191,002	117,897	106,548
Expense
Salaries, wages, and employee benefits	42,963	21,129	17,766
Interest expense	14,193	17,944	19,005
Operating expense	18,094	11,238	8,009
Total expense	75,250	50,311	44,780
Income (loss) before income tax benefit and equity in undistributed (in excess of) net income of subsidiaries	115,752	67,586	61,768
Income tax benefit	6,748	7,480	7,310
Income (loss) before equity in undistributed (in excess of) net income of subsidiaries	122,500	75,066	69,078
Equity in undistributed (in excess of) net income of subsidiaries
Bank	12,762	38,625	53,487
Net income	$ 135,262	$ 113,691	$ 122,565

SIGNIFICANT ACCOUNTING POLICIES - Segment Disclosure (Details)	12 Months Ended
	Dec. 31, 2025 segment
Accounting Policies [Abstract]
Number of reportable segments	3

BUSINESS COMBINATIONS - Schedule of Reconciliation Between the Purchase Price and the Fair Value (Details) - USD ($) $ in Thousands	Mar. 01, 2025	Apr. 01, 2024
CrossFirst
PCD Financial Assets
Gross contractual receivable for PCD financial assets	$ 4,790,000
Fair value of PCD financial assets	4,700,000
CrossFirst \| Financial Asset Acquired with Credit Deterioration
PCD Financial Assets
Gross contractual receivable for PCD financial assets	1,539,718
ACL recorded for estimated uncollectible contractual cash flows specific to PCD financial assets	(100,783)
Interest premium (discount) specific to PCD financial assets	(3,063)
Loans previously charged-off prior to acquisition	(110,740)
Fair value of PCD financial assets	$ 1,325,132
M&M \| Financial Asset Acquired with Credit Deterioration
PCD Financial Assets
Gross contractual receivable for PCD financial assets		$ 29,290
ACL recorded for estimated uncollectible contractual cash flows specific to PCD financial assets		(1,243)
Interest premium (discount) specific to PCD financial assets		(1,773)
Loans previously charged-off prior to acquisition		0
Fair value of PCD financial assets		$ 26,274

SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Collateral Pledged \| Derivative
Junior subordinated debt owed to unconsolidated trusts
Restricted cash and cash equivalents	$ 14.4
Third-Party Service Provider
Junior subordinated debt owed to unconsolidated trusts
Restricted cash and cash equivalents	13.6
Federal Reserve Bank
Junior subordinated debt owed to unconsolidated trusts
Restricted cash	$ 68.1	$ 43.9

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

STOCK-BASED COMPENSATION

12 Months Ended

Dec. 31, 2025

Share-Based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

NOTE 16. STOCK-BASED COMPENSATION

CrossFirst Acquisition

The CrossFirst acquisition impacted Busey and CrossFirst equity awards:

Treatment of Busey’s Equity Awards

Following the closing of the CrossFirst acquisition, except as otherwise provided in the CrossFirst Merger Agreement, Busey equity awards generally remain outstanding and subject to the same terms and conditions as applied immediately prior to the time at which the CrossFirst acquisition became effective (the “effective time”). Notable changes to Busey’s equity awards are as follows:

•ROATCE PSUs — Each PSU issued by Busey that is earned based on Core Return on Average Tangible Common Equity (the “ROATCE PSUs”) and was outstanding immediately prior to the effective time was deemed earned with the achievement of the applicable performance goals based on actual performance through December 31, 2024, the latest practicable date prior to the effective time, and otherwise remains subject to the same terms and conditions (including service-based vesting terms) as applied to such ROATCE PSUs immediately prior to the effective time. The ROATCE PSUs have been deemed earned (i) at 100% of the target level of performance, for the ROATCE PSUs granted in 2023 and (ii) at 75% of the target level of performance, for the ROATCE PSUs granted in 2024. Modifications to the ROATCE PSUs granted in 2023 impacted 108 award holders and generated $0.2 million of incremental cost, and modifications to the ROATCE PSUs granted in 2024 impacted 129 award holders and generated $0.1 million of incremental cost.

•TSR PSUs — Each Busey PSU previously granted that is tied to total stockholder return (“TSR”, and such PSUs, the “TSR PSUs”) with a performance period that ended December 31, 2024, (excluding TSR PSUs previously held by retirees) was replaced, and each TSR PSU outstanding immediately prior to the effective time with performance periods ending December 31, 2025, and December 31, 2026, (including existing TSR PSUs held by retirees) was modified, each effective March 1, 2025, such that the resulting new or modified PSUs (collectively, the “Merger PSUs”) will be earned based on Busey’s relative TSR rank as compared to the KBW Nasdaq Regional Banking Index, measured at the end of a performance period commencing January 1, 2025, and ending December 31, 2026. The Merger PSUs are subject to the terms and conditions of the 2020 Equity Plan and the applicable award agreements. The target number of PSUs subject to each such Merger PSU was determined based on the number of PSUs that would have been earned in respect of the corresponding TSR PSU had performance for such corresponding TSR PSU been determined based on actual performance as of August 26, 2024, the day immediately prior to the announcement of the Merger, which is (i) in the case of the TSR PSUs granted in 2022, 94.5% of the original target level of performance, (ii) in the case of the TSR PSUs granted in 2023, 96.2% of the original target level of performance, and (iii) in the case of the TSR PSUs granted in 2024, 76.9% of the original target level of performance. Such target number also reflects the number of dividend equivalents accrued in respect of the corresponding existing TSR PSU that would have been earned based on the same actual TSR performance. Replacements for TSR PSUs granted in 2022 impacted 107 award holders and generated $1.3 million of replacement cost. Additional information about the Merger PSU replacement grant is included below under the heading “PSU Awards” in the “2020 Equity Plan” section. Modifications to the TSR PSUs granted in 2023 impacted 108 award holders and generated $1.4 million of incremental cost, and modifications to the TSR PSUs granted in 2024 impacted 129 award holders and generated $0.8 million of incremental cost.

•Busey RSUs — Each outstanding Busey time-based restricted stock unit award (the “Busey RSUs”) will vest in equal annual installments over three (3) years following the effective time; provided that if any Busey RSU would otherwise vest by its terms on an earlier date, any then-unvested portion as of such date shall vest on such original vesting date. Modifications to RSU grants impacted 139 award holders and did not generate any incremental cost.

Each Busey equity award will be subject to double-trigger vesting upon an involuntary termination within twelve (12) months following the effective time (at target performance, in the case of Merger PSUs).

Treatment of CrossFirst’s Equity Awards

Equity awards based on CrossFirst Common Stock that were outstanding immediately prior to the effective time were converted, at the effective time, either to Busey Common Stock or to equity awards based on Busey Common Stock, as follows:

•Director equity awards — Each CrossFirst restricted stock award held by a CrossFirst non-employee director and each deferred share of CrossFirst Common Stock that was credited to a director participant’s account under the CrossFirst 2018 Directors’ Deferred Fee Plan was converted into the right to receive 0.6675 shares of Busey Common Stock (the “Exchange Ratio”).

•CrossFirst RSUs — Each CrossFirst time-based restricted stock unit award (“CrossFirst RSU”) was converted into a restricted stock unit in respect of Busey Common Stock (a “Busey RSU”) based on the Exchange Ratio, rounded to the nearest whole share, subject to the same terms and conditions as were applicable to the CrossFirst RSUs prior to the effective time.

•CrossFirst PSUs — Each CrossFirst performance-based restricted stock unit award (“CrossFirst PSU”) was converted into a time-based Busey RSU based on the Exchange Ratio, subject to the same terms and conditions as were applicable to the CrossFirst PSUs prior to the effective time, assuming the achievement of the applicable performance goals based on, for the CrossFirst PSUs granted in 2023, actual performance through December 31, 2024, and, for the CrossFirst PSUs granted in 2024, target performance, rounded to the nearest whole share.

•CrossFirst SSARs — Each CrossFirst SSAR was converted into a stock appreciation right in respect of Busey Common Stock based on the Exchange Ratio, rounded down to the nearest whole share (and exercise price rounded up to the nearest cent), generally subject to the same terms and conditions as were applicable to the CrossFirst SSAR prior to the effective time.

Upon vesting and delivery, shares are expected, though not required, to be issued from treasury stock. Busey issued 108,021 treasury shares in conjunction with the settlement in 2025 of RSUs and SSARs that were awarded under the CrossFirst Bankshares, Inc. 2018 Omnibus Equity Incentive Plan, as Amended and Restated. The difference between the number of shares issued and the number of vested units is due to shares issued under a net share settlement option.

Stock Options


Options	Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Intrinsic Value ($000's)
Outstanding at December 31, 2024	15,106	$	23.53	1.87 years	$	1



Outstanding at December 31, 2025	15,106	$	23.53	0.87 years	4

Exercisable at December 31, 2025	15,106	$	23.53	0.87 years	4

Stock Settled Appreciation Rights

Busey issued replacement awards in the form of SSARs as part of the acquisition of CrossFirst. These awards were issued under the CrossFirst Bankshares 2018 Omnibus Equity Incentive Plan with exercise prices equal to the closing price of CrossFirst’s common shares on the original date for each award adjusted by the Exchange Ratio of 0.6675, rounded up to the nearest cent. At grant, SSARs typically vested ratably over seven years of continuous service with a ten-year or fifteen-year contractual term. At grant, replacement SSARs had a weighted average remaining contractual term of 5.4 years, and unvested replacement SSARs had a weighted average remaining vesting period of 3.2 years. The fair value of each SSAR was estimated at acquisition date using a Monte Carlo simulation since the awards were all in-the-money. The fair value of SSARs that vested during 2025 was $3.7 million.

A summary of SSAR activity during 2025 is presented below:


SSARs	Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Intrinsic Value ($000's)
Outstanding at December 31, 2024	—	$	—	—	$	—
Replacement of CrossFirst SSARs	424,390	15.78
Exercised1	(119,842)	13.31
Forfeited	(4,005)	16.00
Expired	(30,145)	23.23
Outstanding at December 31, 2025	270,398	$	16.04	4.98 years	2,095

Exercisable at December 31, 2025	253,560	$	15.70	4.94 years	2,051

___________________________________________

1. The aggregate intrinsic value of SSARs exercised during 2025 was $1.1 million.


	Year Ended December 31, 2025
Assumptions
Expected volatility1	29.10% – 36.70%
Expected dividends2	4.17%
Simulation term3, 4, 5	4.20 years – 5.69 years
Risk-free rate6	3.97% – 4.03%
Weighted average grant date fair value per share	$	8.94

___________________________________________

1.Expected volatility was calculated using a historical volatility of Busey’s stock price over a period commensurate with the simulation term of the SSARs.

2.The dividend yield was calculated using Busey’s annual dividend and closing stock price on the date of acquisition.

3.The simulation term was commensurate with the midpoint of the longest expected term across all SSARs and was impacted by expected exercise behavior and termination rate.

5.As a component of determining the simulation term, termination rate was assumed to be between 25% and 50% in the first year following the acquisition and 5% for every year thereafter.

6.The risk-free rate for the simulation term of the SSARs was based on the continuously compounded semi-annual zero-coupon U.S. Treasury rates.

2020 Equity Plan

The 2020 Equity Plan was originally approved by stockholders at the 2020 Annual Meeting of Stockholders. A description of the 2020 Equity Plan, as originally approved, can be found in Appendix A within Busey’s Proxy Statement for the 2020 Annual Meeting of Stockholders filed on April 9, 2020. An amendment and restatement of the 2020 Equity Plan was approved by stockholders at the 2023 Annual Meeting of Stockholders. Terms of the amended and restated 2020 Equity Plan are substantially identical to those of the originally approved 2020 Equity Plan, other than a 1,350,000 increase in the number of shares authorized for issuance under the plan. More information can be found in Appendix A within Busey’s Proxy Statement for the 2023 Annual Meeting of Stockholders filed on April 14, 2023.

Busey has granted RSU, PSU, and DSU awards under the terms of its 2020 Equity Plan. A description of RSU, PSU, and DSU awards granted in 2025 under the terms of the 2020 Equity Plan is provided below. A description of RSU, PSU, and DSU awards granted in 2024 and 2023 under the terms of the 2020 Equity Plan can be found in Busey’s Annual Reports for the years ended December 31, 2024, and 2023, respectively.

Upon vesting and delivery, shares are expected, though not required, to be issued from treasury stock. Busey issued 437,670 treasury shares in conjunction with the settlement in 2025 of RSUs, PSUs, and DSUs that were awarded under the 2020 Equity Plan. The difference between the number of shares issued and the number of vested units is due to shares issued under a net share settlement option. There were 658,552 shares available for issuance under the 2020 Equity Plan as of December 31, 2025.

RSU Awards

Busey grants RSU awards to members of management periodically throughout the year. RSU awards are stock-based awards for which vesting is conditional upon meeting established service criteria. Each RSU represents the future right to receive one share of Busey’s common stock. Recipients earn quarterly dividend equivalents on their respective RSUs, which entitle the recipients to additional units. Therefore, dividends earned each quarter compound based upon the updated unit balances.

On March 26, 2025, under the terms of the 2020 Equity Plan, Busey granted 348,269 RSUs to members of management. The grant date fair value of the award was $7.7 million, which will be recognized as compensation expense over the requisite service period. These awards will vest in equal installments over three years, on each anniversary of the grant date. The terms of these awards included an accelerated vesting provision upon eligible retirement from Busey, after a one-year minimum requisite service period.

On May 29, 2025, under the terms of the 2020 Equity Plan, Busey granted 4,494 RSUs to members of management. The grant date fair value of the award was $0.1 million, which will be recognized as compensation expense over the requisite service period. These awards will vest in equal installments over three years, on each anniversary of the grant date.

On July 23, 2025, under the terms of the 2020 Equity Plan, Busey granted 13,724 RSUs to members of management. The grant date fair value of the award was $0.3 million, which will be recognized as compensation expense over the requisite service period. These awards will vest on July 23, 2028.

On October 8, 2025, under the terms of the 2020 Equity Plan, Busey granted 21,395 RSUs to a member of management. The grant date fair value of the award was $0.5 million, which will be recognized as compensation expense over the requisite service period. These awards will vest on October 8, 2028.

A summary of changes in Busey’s RSU awards for the year ended December 31, 2025, is presented in the following table:


RSU Awards	Shares	Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2024	1,066,772	$	21.80
Conversion of Busey ROATCE PSUs to RSUs	157,094	23.99
Replacement of CrossFirst RSUs and PSUs	341,048	23.99
Granted	387,882	22.28
Dividend equivalents earned	63,864	22.32
Vested	(547,788)	20.77
Forfeited	(148,335)	22.48
Nonvested at December 31, 2025	1,320,537	$	23.14

PSU Awards

Busey grants PSU awards to members of management periodically throughout the year. PSU awards are stock-based awards for which vesting is conditional upon meeting established performance criteria for the applicable performance period and providing continuous service through the end of such performance period. Each PSU represents the future right to receive one share of Busey’s common stock. The number of PSUs that ultimately vest will be determined based on the extent to which the established performance criteria are achieved. Busey’s PSUs are subject to accelerated service-based vesting conditions upon eligible retirement from Busey. After performance determination, dividend equivalents are compounded based upon the updated PSU balances at each dividend date during the performance period.

On March 1, 2025, under the terms of the 2020 Equity Plan, in connection with the CrossFirst acquisition, Busey granted a target of 59,471 Merger PSUs with a maximum award of 95,154 units, which replaced the TSR PSUs granted in 2022. The actual number of units issued at the vesting date could range from 0% to 160% of the initial grant, depending on attaining a relative total stockholder return performance goal. The grant date fair value of the award, calculated using the Geometric Brownian Motion Model, was $1.3 million, which will be recognized in compensation expense over the performance period ending December 31, 2026.

On March 26, 2025, under the terms of the 2020 Equity Plan, Busey granted a target of 174,126 PSUs with a maximum award of 278,602 units. The actual number of units issued at the vesting date could range from 0% to 160% of the initial grant, depending on attaining a relative total stockholder return performance goal. The grant date fair value of the award, calculated using the Geometric Brownian Motion Model, was $3.4 million, which will be recognized in compensation expense over the performance period ending December 31, 2027.

On March 26, 2025, under the terms of the 2020 Equity Plan, Busey granted a target of 174,126 PSUs with a maximum award of 278,602 units. The actual number of units issued at the vesting date could range from 0% to 160% of the initial grant, depending on attaining an adjusted return on average tangible common equity performance goal. The grant date fair value of the award was $3.9 million, which will be recognized in compensation expense over the performance period ending December 31, 2027. The actual amount of compensation expense recognized for these awards is subject to adjustment based on the extent to which performance goals are expected to be achieved.

A summary of changes in Busey’s PSU awards for the year ended December 31, 2025, is presented in the following table:


PSU Awards	Shares1	Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2024	372,042	$	21.15
Modifications based on CrossFirst acquisition2	(181,828)	20.43
Granted	407,723	20.99
Dividend equivalents earned	198	21.87
Vested	(21,792)	20.61
Forfeited	(50,842)	20.94

Nonvested at December 31, 2025	525,501	$	21.32

Vested and outstanding at December 31, 20253	13,455	$	20.44

___________________________________________

1.Shares for PSU awards represent target shares at grant date.

2.Modifications include PSUs that were converted to RSUs as well as balance adjustments related to the 2023 TSR PSUs and the 2024 TSR PSUs.

DSU Awards

On March 26, 2025, under the terms of the 2020 Equity Plan, Busey granted 39,846 DSUs to non-employee directors. The grant date fair value of the award totaled $0.9 million and will be recognized as compensation expense over the requisite service period of one year. Subsequent to the requisite service period, the awards will become 100% vested.

A summary of changes in Busey’s DSU awards for the year ended December 31, 2025, is presented in the following table:


DSU Awards	Shares	Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2024	36,893	$	23.40
Granted	39,846	22.16
Dividend equivalents earned	8,518	22.64
Vested	(44,039)	23.29

Nonvested at December 31, 2025	41,218	$	22.16

Vested and outstanding at December 31, 2025	146,076	$	23.01

Employee Stock Purchase Plan

The First Busey Corporation ESPP was approved at Busey’s 2021 Annual Meeting of Stockholders. The purpose of the ESPP is to provide a means through which Busey employees may acquire a proprietary interest in the Company by purchasing shares of its common stock at a 15% discount through voluntary payroll deductions, to assist in retaining the services of current employees and securing and retaining the services of new employees, and to provide incentives for Busey employees to exert maximum efforts toward the Company’s success. Substantially all of Busey’s employees are eligible to participate, and all participating employees have equal rights and privileges under the terms of the ESPP. Further details can be found in Appendix A within Busey’s Definitive Proxy Statement filed with the SEC on April 8, 2021.

The ESPP initially reserved for issuance and purchase an aggregate of 600,000 shares of Busey’s common stock. The first offering under the ESPP began on July 1, 2021. There were 295,946 shares available for issuance under the ESPP as of December 31, 2025.

Stock-Based Compensation Expense

Busey recognized compensation expense related to non-vested equity awards as summarized in the table below:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024		2023
Stock-based compensation expense

SSARs	Salaries, wages, and employee benefits	$	137	$	—	$	—
RSU awards	Salaries, wages, and employee benefits	10,657		3,823		2,622
PSU awards1	Salaries, wages, and employee benefits	5,158		2,867		2,962
DSU awards	Other expense	842		826		833
ESPP	Salaries, wages, and employee benefits	326		210		178
Total stock-based compensation expense		$	17,120	$	7,726	$	6,595

___________________________________________

As all outstanding stock options were fully vested, no compensation expense was recorded for stock options for the years ended December 31, 2025, 2024, and 2023, and no unrecognized compensation expense remains for Busey’s stock option awards as of December 31, 2025.

Unamortized stock-based compensation expense is presented in the table below:


	As of December 31,
(dollars in thousands)	2025		2024
Unamortized stock-based compensation
SSARs	$	98	$	—
RSU awards	9,236		7,093
PSU awards1	5,769		3,043
DSU awards	206		181
Total unamortized stock-based compensation	$	15,309	$	10,317

Weighted average period over which expense is to be recognized on awards issued under Busey's 2020 Equity Plan	1.8 years		2.5 years
Weighted average period over which expense is to be recognized on CrossFirst replacement awards	1.2 years		N/A

___________________________________________

For additional information about Busey’s accounting policies related to stock-based compensation, see “Stock-Based Compensation” in “Note 1. Significant Accounting Policies.”

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Reclassification of Unrealized Gains and Losses from OCI (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Interest Rate Swap \| Cash Flow Hedging \| Interest Income
Derivative Financial Instruments
Unrealized gains (losses) expected to be reclassified from OCI to interest income	$ (521)

STOCK-BASED COMPENSATION - Schedule of changes in the Company's RSU, PSU, and DSU awards (Details)	12 Months Ended
	Dec. 31, 2025 $ / shares shares
RSU awards
Shares
Non-vested at beginning of period (in shares) \| shares	1,066,772
Conversion of Busey ROATCE PSUs to RSUs (in shares) \| shares	157,094
Granted (in shares) \| shares	387,882
Dividend equivalents earned (in shares) \| shares	63,864
Vested (in shares) \| shares	(547,788)
Forfeited (in shares) \| shares	(148,335)
Non-vested at end of period (in shares) \| shares	1,320,537
Weighted- Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) \| $ / shares	$ 21.80
Conversion of Busey ROATCE PSUs to RSUs (in dollars per share) \| $ / shares	23.99
Granted (in dollars per share) \| $ / shares	22.28
Dividend equivalents earned (in dollars per share) \| $ / shares	22.32
Vested (in dollars per share) \| $ / shares	20.77
Forfeited (in dollars per share) \| $ / shares	22.48
Non-vested at end of period (in dollars per share) \| $ / shares	$ 23.14
RSU awards \| CrossFirst
Shares
Replacement of CrossFirst RSUs and PSUs (in shares) \| shares	341,048
Weighted- Average Grant Date Fair Value
Replacement of CrossFirst RSUs and PSUs (in dollars per share) \| $ / shares	$ 23.99
PSU awards
Shares
Non-vested at beginning of period (in shares) \| shares	372,042
Modifications based on CrossFirst acquisition (in shares) \| shares	(181,828)
Granted (in shares) \| shares	407,723
Dividend equivalents earned (in shares) \| shares	198
Vested (in shares) \| shares	(21,792)
Forfeited (in shares) \| shares	(50,842)
Non-vested at end of period (in shares) \| shares	525,501
Vested and outstanding at end of period (in shares) \| shares	13,455
Weighted- Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) \| $ / shares	$ 21.15
Modifications based on CrossFirst acquisition (in dollars per share) \| $ / shares	20.43
Granted (in dollars per share) \| $ / shares	20.99
Dividend equivalents earned (in dollars per share) \| $ / shares	21.87
Vested (in dollars per share) \| $ / shares	20.61
Forfeited (in dollars per share) \| $ / shares	20.94
Non-vested at end of period (in dollars per share) \| $ / shares	21.32
Vested and outstanding at end of period (in dollars per share) \| $ / shares	$ 20.44
DSU awards
Shares
Non-vested at beginning of period (in shares) \| shares	36,893
Granted (in shares) \| shares	39,846
Dividend equivalents earned (in shares) \| shares	8,518
Vested (in shares) \| shares	(44,039)
Non-vested at end of period (in shares) \| shares	41,218
Vested and outstanding at end of period (in shares) \| shares	146,076
Weighted- Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) \| $ / shares	$ 23.40
Granted (in dollars per share) \| $ / shares	22.16
Dividend equivalents earned (in dollars per share) \| $ / shares	22.64
Vested (in dollars per share) \| $ / shares	23.29
Non-vested at end of period (in dollars per share) \| $ / shares	22.16
Vested and outstanding at end of period (in dollars per share) \| $ / shares	$ 23.01

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 135,262	$ 113,691	$ 122,565
Unrealized/Unrecognized gains (losses) on debt securities:
Net unrealized holding gains (losses) on debt securities available for sale	76,192	10,295	58,498
Reclassification adjustment for realized (gains) losses on debt securities available for sale included in net income	15,242	7,033	5,503
Amortization of unrecognized losses on securities transferred to held to maturity	4,981	5,481	6,189
Tax effect	(26,038)	(7,934)	(20,006)
Net change in unrealized/unrecognized gains (losses) on debt securities	70,377	14,875	50,184
Unrealized gains (losses) on cash flow hedges:
Net unrealized holding gains (losses) on cash flow hedges	7,780	(13,055)	(2,567)
Reclassification adjustment for realized (gains) losses on cash flow hedges included in net income	8,432	9,291	8,569
Tax effect	(4,023)	653	(1,711)
Net change in unrealized gains (losses) on cash flow hedges	12,189	(3,111)	4,291
OCI	82,566	11,764	54,475
Total comprehensive income	$ 217,828	$ 125,455	$ 177,040

OUTSTANDING COMMITMENTS AND CONTINGENT LIABILITIES (Details) $ in Thousands	Jul. 02, 2025 USD ($)	Dec. 31, 2025 USD ($)	Nov. 25, 2025 lawsuit	Dec. 31, 2024 USD ($)
Credit Commitments and Contingencies
Total commitments		$ 4,820,613		$ 2,548,178
Income tax examination, number of lawsuits filed \| lawsuit			2
Federal
Credit Commitments and Contingencies
Income tax examination, number of lawsuits filed \| lawsuit			1
Illinois
Credit Commitments and Contingencies
Income tax examination, number of lawsuits filed \| lawsuit			1
Minimum
Credit Commitments and Contingencies
Estimated amount due	$ 28,000
Estimated amount due, interest	17,400
Estimated amount due, penalties (approximately)	$ 300
Commitments to extend credit
Credit Commitments and Contingencies
Total commitments		4,696,867		2,512,714
Standby letters of credit
Credit Commitments and Contingencies
Total commitments		$ 123,746		$ 35,464

FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	$ 2,162,548	$ 1,810,221
Equity securities	14,916	15,862
Obligations of U.S. government corporations and agencies
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	112,046	1,400
Obligations of states and political subdivisions
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	263,873	139,829
Asset-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	265,580	336,557
Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	132,942	92,174
Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	1,344,416	1,087,210
Corporate debt securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	43,691	153,051
Fair Value, Recurring
Financial assets and financial liabilities measured at fair value
Derivative assets	30,932	30,373
Derivative liabilities	42,220	58,099
Fair Value, Recurring \| Obligations of U.S. government corporations and agencies
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	112,046	1,400
Fair Value, Recurring \| Obligations of states and political subdivisions
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	263,873	139,829
Fair Value, Recurring \| Asset-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	265,580	336,557
Fair Value, Recurring \| Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	132,942	92,174
Fair Value, Recurring \| Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	1,344,416	1,087,210
Fair Value, Recurring \| Corporate debt securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	43,691	153,051
Fair Value, Recurring \| Equity securities
Financial assets and financial liabilities measured at fair value
Equity securities	14,916	15,862
Fair Value, Recurring \| Level 1 Inputs
Financial assets and financial liabilities measured at fair value
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Recurring \| Level 1 Inputs \| Obligations of U.S. government corporations and agencies
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 1 Inputs \| Obligations of states and political subdivisions
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 1 Inputs \| Asset-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 1 Inputs \| Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 1 Inputs \| Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 1 Inputs \| Corporate debt securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 1 Inputs \| Equity securities
Financial assets and financial liabilities measured at fair value
Equity securities	155	5,567
Fair Value, Recurring \| Level 2 Inputs
Financial assets and financial liabilities measured at fair value
Derivative assets	30,902	30,368
Derivative liabilities	42,155	58,099
Fair Value, Recurring \| Level 2 Inputs \| Obligations of U.S. government corporations and agencies
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	112,046	1,400
Fair Value, Recurring \| Level 2 Inputs \| Obligations of states and political subdivisions
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	263,873	139,829
Fair Value, Recurring \| Level 2 Inputs \| Asset-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	265,580	336,557
Fair Value, Recurring \| Level 2 Inputs \| Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	132,942	92,174
Fair Value, Recurring \| Level 2 Inputs \| Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	1,344,416	1,087,210
Fair Value, Recurring \| Level 2 Inputs \| Corporate debt securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	43,691	153,051
Fair Value, Recurring \| Level 2 Inputs \| Equity securities
Financial assets and financial liabilities measured at fair value
Equity securities	14,761	10,295
Fair Value, Recurring \| Level 3 Inputs
Financial assets and financial liabilities measured at fair value
Derivative assets	30	5
Derivative liabilities	65	0
Fair Value, Recurring \| Level 3 Inputs \| Obligations of U.S. government corporations and agencies
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 3 Inputs \| Obligations of states and political subdivisions
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 3 Inputs \| Asset-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 3 Inputs \| Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 3 Inputs \| Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 3 Inputs \| Corporate debt securities
Financial assets and financial liabilities measured at fair value
Debt securities available for sale	0	0
Fair Value, Recurring \| Level 3 Inputs \| Equity securities
Financial assets and financial liabilities measured at fair value
Equity securities	$ 0	$ 0

PORTFOLIO LOANS - Schedule of Distribution of Portfolio Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	$ 13,567,799	$ 7,697,087
ACL	(174,023)	(83,404)	$ (91,740)	$ (91,608)
Portfolio loans, net	13,393,776	7,613,683
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	10,818,515	5,552,288
Commercial loans \| C&I and other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	4,229,208	1,904,515
ACL	(61,370)	(21,589)	(21,256)	(23,860)
Commercial loans \| CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	5,550,018	3,269,564
ACL	(70,328)	(32,301)	(35,465)	(38,299)
Commercial loans \| Real estate construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	1,039,289	378,209
ACL	(11,568)	(3,345)	(5,163)	(6,457)
Retail loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	2,749,284	2,144,799
Retail loans \| CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	2,154,616	1,696,457
ACL	(29,178)	(23,711)	(26,298)	(18,193)
Retail loans \| Retail other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total portfolio loans	594,668	448,342
ACL	$ (1,579)	$ (2,458)	$ (3,558)	$ (4,799)

STOCK-BASED COMPENSATION - 2021 Employee Stock Purchase Plan and Stock-Based Compensation Expense (Details) - USD ($)		12 Months Ended
	Jul. 01, 2021	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation
Compensation expense recognized		$ 17,120,000	$ 7,726,000	$ 6,595,000
Stock options
Share-based Compensation
Compensation expense recognized		0	$ 0	$ 0
Unrecognized stock-based compensation expense		$ 0
Employee Stock Purchase Plan
Share-based Compensation
Discount through voluntary payroll deductions (as percentage)	15.00%
Remaining shares available for issuance (in shares)	600,000	295,946

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Asset Disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Goodwill and other intangibles assets
Intangible assets, gross	$ 220,332	$ 138,549
Accumulated amortization	122,883	106,269
Total estimated amortization expense	97,449	32,280
Core deposit intangible
Goodwill and other intangibles assets
Intangible assets, gross	187,194	105,411
Accumulated amortization	93,558	78,831
Total estimated amortization expense	93,636	26,580
Customer relationship intangible
Goodwill and other intangibles assets
Intangible assets, gross	33,138	33,138
Accumulated amortization	29,325	27,438
Total estimated amortization expense	$ 3,813	$ 5,700

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

INCOME TAXES - Narrative (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Operating loss carryforwards	$ 20,500,000
Valuation allowance, deferred tax assets	700,000
Deferred tax assets valuation allowance	$ 712,000	$ 0

FAIR VALUE MEASUREMENTS - Schedule of Activity for Financial Assets Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO and other repossessed assets with subsequent impairment	$ 700	$ 63
Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually, net of related allowance	19,604	616
Bank property held for sale with impairment	1,855	2,841
Fair Value, Nonrecurring \| OREO and other repossessed assets with subsequent impairment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO and other repossessed assets with subsequent impairment	4,409
Fair Value, Nonrecurring \| Level 1 Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually, net of related allowance	0	0
Bank property held for sale with impairment	0	0
Fair Value, Nonrecurring \| Level 1 Inputs \| OREO and other repossessed assets with subsequent impairment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO and other repossessed assets with subsequent impairment	0
Fair Value, Nonrecurring \| Level 2 Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually, net of related allowance	0	0
Bank property held for sale with impairment	0	0
Fair Value, Nonrecurring \| Level 2 Inputs \| OREO and other repossessed assets with subsequent impairment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO and other repossessed assets with subsequent impairment	0
Fair Value, Nonrecurring \| Level 3 Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually, net of related allowance	19,604	616
Bank property held for sale with impairment	1,855	$ 2,841
Fair Value, Nonrecurring \| Level 3 Inputs \| OREO and other repossessed assets with subsequent impairment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO and other repossessed assets with subsequent impairment	$ 4,409

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2025

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Financial Instruments Owned and Pledged as Collateral


	As of December 31,
(dollars in thousands)	2025		2024
Pledged loans
FHLB	$	5,051,512	$	4,813,600
Federal Reserve Bank	1,854,423		765,824
Total pledged loans	$	6,905,935	$	5,579,424

To secure its obligations under derivative contracts, Busey pledged cash and held collateral as follows:


	As of December 31,
(dollars in thousands)	2025		2024
Cash pledged to secure obligations under derivative contracts	$	14,400	$	21,900
Collateral held to secure obligations under derivative contracts	5,050		20,260

Schedule of the Interest-Rate Swaps Designated as Cash Flow Hedges

A summary of the interest-rate swaps designated as cash flow hedges is presented below:


		As of December 31,
(dollars in thousands)	Location	2025			2024
Prime Loan Swap
Notional amount		$	300,000		$	300,000
Weighted average rate: receive-fixed		4.81		%	4.81		%
Weighted average variable Prime pay rates		6.81		%	7.62		%
Weighted average maturity		3.10 years			4.10 years

SOFR Loan Swaps
Notional amount		$	200,000		$	200,000
Weighted average rate: receive-fixed		3.78		%	3.78		%
Weighted average variable 1-month CME Term SOFR pay rates		3.82		%	—		%
Weighted average maturity		3.76 years			4.76 years

Gross aggregate fair value of the swaps
Gross aggregate fair value of swap assets	Other assets	$	3,215		$	—
Gross aggregate fair value of swap liabilities	Other liabilities	$	14,589		$	27,770

Balances carried in AOCI
Unrealized gains (losses) on cash flow hedges, net of tax	AOCI	$	(7,616)		$	(19,805)

Schedule of Reclassification of Unrealized Gains and Losses from OCI


(dollars in thousands)	As of December 31, 2025

Unrealized gains (losses) expected to be reclassified from OCI to interest income	$	(521)

Schedule of Interest Income (Expense) Recorded on Swap Transactions

Interest income and interest expense recorded on swap transactions is presented in the following table:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Interest on swap transactions
Increase (decrease) in interest income on swap transactions	$	(8,432)	$	(10,669)	$	(10,326)
(Increase) decrease in interest expense on swap transactions	—		1,378		1,757
Net increase (decrease) in net interest income on swap transactions	$	(8,432)	$	(9,291)	$	(8,569)

Schedule of Net Gains (Losses) Relating to these Derivative Instruments

Net gains (losses) relating to cash flow derivative instruments that were recorded in OCI on the Consolidated Statements of Income are presented in the table below:


	Years Ended December 31,
(dollars in thousands)	2025		2024		2023
Unrealized gains (losses) on cash flow hedges
Net gain (loss) recognized in OCI, net of tax	$	5,919	$	(10,790)	$	(1,835)
(Gain) loss reclassified from OCI to interest income, net of tax	6,270		8,818		7,382
(Gain) loss reclassified from OCI to interest expense, net of tax	—		(1,139)		(1,256)
Net change in unrealized gains (losses) on cash flow hedges, net of tax	$	12,189	$	(3,111)	$	4,291

Changes in fair value of these derivative assets and derivative liabilities were recorded in noninterest expense on the Consolidated Statements of Income and are summarized as follows:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024		2023
Interest rate swaps
Receive-fixed, pay-floating	Noninterest expense	$	(2,604)	$	1,726	$	(11,525)
Receive-floating, pay-fixed	Noninterest expense	2,604		(1,726)		11,525
Net change in fair value of interest rate swaps		$	—	$	—	$	—

Gains and losses relating to these derivative instruments are reported in noninterest income, and are summarized as follows:


		Years Ended December 31,
(dollars in thousands)	Location	2025		2024		2023
Net gains (losses) on mortgage banking derivatives
Gains (losses) on interest rate lock commitments	Mortgage revenue	$	789	$	585	$	—
Gains (losses) on forward sales commitments	Mortgage revenue	(40)		(147)		2
Net gains (losses) on mortgage banking derivatives		$	749	$	438	$	2

Schedule of Fair Values of Derivative Assets and Liabilities Recorded in Consolidated Balance Sheet

Amounts and fair values of derivative assets and derivative liabilities related to customer interest rate swaps recorded on the Consolidated Balance Sheets are summarized as follows:


		As of December 31, 2025				As of December 31, 2024
(dollars in thousands)	Location	Notional Amount		Fair Value		Notional Amount		Fair Value
Derivative assets not designated as hedging instruments
Interest rate swaps: receive-fixed, pay-floating	Other assets	$	703,286	$	11,542	$	156,539	$	1,465
Interest rate swaps: receive-floating, pay-fixed	Other assets	456,973		15,998		562,697		28,854
Derivative assets not designated as hedging instruments		$	1,160,259	$	27,540	$	719,236	$	30,319

Derivative liabilities not designated as hedging instruments
Interest rate swaps: receive-fixed, pay-floating	Other liabilities	$	456,973	$	15,998	$	562,697	$	28,854
Interest rate swaps: receive-floating, pay-fixed	Other liabilities	703,286		11,542		156,539		1,465
Derivative liabilities not designated as hedging instruments		$	1,160,259	$	27,540	$	719,236	$	30,319

Amounts and fair values of mortgage banking derivatives included on the Consolidated Balance Sheets are summarized as follows:


		As of December 31, 2025				As of December 31, 2024
(dollars in thousands)	Location	Notional Amount		Fair Value		Notional Amount		Fair Value
Mortgage banking derivative assets
Interest rate lock commitments	Other assets	$	6,159	$	145	$	2,430	$	28
Forward sales commitments	Other assets	1,520		2		3,457		21
Mortgage banking derivative assets		$	7,679	$	147	$	5,887	$	49

Mortgage banking derivative liabilities
Interest rate lock commitments	Other liabilities	$	—	$	—	$	436	$	4
Forward sales commitments	Other liabilities	9,278		26		1,955		6
Mortgage banking derivative liabilities		$	9,278	$	26	$	2,391	$	10

Schedule of Notional Amount and Fair Value of Risk Participation Agreement

The risk participation agreements mature between May 2026 and October 2033, and are summarized as follows:


	As of December 31,
(dollars in thousands)	2025		2024
Risk participation agreements purchased
Number of risk participation agreements	12		5
Notional amount	$	74,590	$	40,092
Fair value	30		5

Risk participation agreements sold
Number of risk participation agreements	13		—
Notional amount	$	108,743	$	—
Fair value	65		—

OPERATING SEGMENTS AND RELATED INFORMATION

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

OPERATING SEGMENTS AND RELATED INFORMATION

NOTE 23. OPERATING SEGMENTS AND RELATED INFORMATION

Busey’s reportable segments are determined by its chief executive officer, who is the designated chief operating decision maker. Busey is organized into three reportable operating segments: Banking, Wealth Management, and FirsTech. These operating segments are strategic business units that are separately managed, as they offer different products and services and have different marketing strategies.

To evaluate segment performance and make informed decisions regarding the allocation of capital and personnel to the segments, the chief operating decision maker reviews each segment’s revenues, consisting of net interest income plus noninterest income, and net income, against budgeted revenues and net income on a monthly basis. This process enables Busey to (1) determine the cost and availability of funds within each business segment, (2) assess the profitability of a specific business segment by aligning relevant costs with revenues, and (3) evaluate each business segment in a way that reflects its economic impact on consolidated earnings.

Banking

The Banking operating segment provides a full range of banking services to individual and corporate customers through First Busey Corporation’s wholly-owned bank subsidiary, Busey Bank.

Busey Bank has 79 banking centers located throughout Illinois; the St. Louis, Missouri MSA; southwest Florida; Indianapolis, Indiana; the Dallas-Fort Worth MSA; the Kansas City MSA; Wichita, Kansas; Oklahoma City and Tulsa, Oklahoma; Phoenix and Tucson, Arizona; Denver and Colorado Springs, Colorado; and Clayton, New Mexico.

Banking services offered to individual customers include customary types of demand and savings deposits, money transfers, safe deposit services, individual retirement accounts and other fiduciary services, automated teller machines, and technology-based networks, as well as a variety of loan products including residential real estate, home equity lines of credit, and consumer loans. Banking services offered to corporate customers include commercial, CRE, real estate construction, and agricultural loans, as well as commercial depository services such as cash management.

Wealth Management

The Wealth Management operating segment provides a full range of asset management, investment, brokerage, fiduciary, philanthropic advisory, tax preparation, and farm management services to individuals, businesses, and foundations. Services are provided through Busey Capital Management, Inc., a wholly-owned subsidiary of Busey Bank, and Busey Wealth Management, a division of Busey Bank.

Wealth management services tailored to individuals include trust and estate advisory services and financial planning. Business services include business succession planning and employee retirement plan services. Services for foundations include investment strategy consulting and fiduciary services.

FirsTech

The FirsTech operating segment provides comprehensive and innovative payment technology solutions through Busey Bank’s wholly-owned subsidiary, FirsTech. FirsTech's multi-channel payment platform allows businesses to collect payments from their customers in a variety of ways to enable fast, frictionless payments. Payment method vehicles include text-based mobile bill pay; interactive voice response; electronic payment concentration delivered to Automated Clearing House networks, money management, and credit card networks; walk-in payment processing for customers at retail pay agents; customer service payments made over a telephone; direct debit services; merchant services referral solutions serving partner Financial Institutions and their business customers; and lockbox remittance processing for customers to make payments by mail. FirsTech also provides additional tools to help clients with billing, reconciliation, bill reminders, and treasury services.

FirsTech's client base represents a diverse set of industries, with a higher concentration in highly regulated industries, such as financial institutions, utility, insurance, and telecommunications industries.

Segment Financial Information

The segment financial information provided below has been derived from information used by management to monitor and manage Busey’s financial performance. The accounting policies of Busey’s operating segments are the same as those described in the summary of significant accounting policies in “Note 1. Significant Accounting Policies.” Busey accounts for intersegment revenue and transfers at current market prices.


	As of December 31, 2025
(dollars in thousands)	Banking		Wealth Management		FirsTech		Other		Total
Goodwill	$	360,180	$	14,108	$	8,992	$	—	$	383,280
Total assets	17,880,797		152,422		45,373		26,144		18,104,736


	As of December 31, 2024
(dollars in thousands)	Banking		Wealth Management		FirsTech		Other		Total
Goodwill	$	310,595	$	14,108	$	8,992	$	—	$	333,695
Total assets	11,856,651		126,180		57,737		6,154		12,046,722

Financial results by operating segment, including significant expense categories provided to the chief operating decision maker, are summarized below:


	Year Ended December 31, 2025
(dollars in thousands)	Banking		Wealth Management		FirsTech		Other		Total
Interest income	$	893,854	$	—	$	—	$	6	$	893,860
Intersegment interest income	—		—		62		(62)		—
Interest expense	310,058		—		—		14,193		324,251
Intersegment interest expense	3,210		—		—		(3,210)		—
Net interest income	580,586		—		62		(11,039)		569,609
Provision for credit losses	52,743		—		—		—		52,743
Net interest income after provision for credit losses	527,843		—		62		(11,039)		516,866

Noninterest income
Wealth management fees	—		69,426		—		—		69,426
Payment technology solutions	—		—		20,000		—		20,000
Treasury management services	17,322		—		—		—		17,322
Card services and ATM fees	18,048		—		—		—		18,048
Other service charges on deposit accounts	6,281		—		—		—		6,281
All other noninterest income	11,701		754		(11)		6,454		18,898
Intersegment noninterest income	1,795		—		1,588		(3,383)		—
Noninterest income	55,147		70,180		21,577		3,071		149,975

Revenue	635,733		70,180		21,639		(7,968)		719,584

Noninterest expense
Salaries, wages, and employee benefits	206,640		28,870		10,589		42,964		289,063
Data processing	36,551		2,590		3,702		338		43,181
Amortization of intangible assets	15,735		879		—		—		16,614
Interchange expense	—		—		5,194		—		5,194
All other noninterest expense	104,371		2,691		2,818		16,269		126,149
Intersegment noninterest expense	18,427		3,330		1,534		(23,291)		—
Noninterest expense	381,724		38,360		23,837		36,280		480,201

Income (loss) before income taxes	201,266		31,820		(2,198)		(44,248)		186,640
Income taxes	50,924		7,637		(435)		(6,748)		51,378
Net income	$	150,342	$	24,183	$	(1,763)	$	(37,500)	$	135,262


	Year Ended December 31, 2024
	Banking		Wealth Management		FirsTech		Other		Total
Interest income	$	523,648	$	—	$	—	$	33	$	523,681
Intersegment interest income	324		—		48		(372)		—
Interest expense	183,126		—		—		17,944		201,070
Intersegment interest expense	2,664		—		—		(2,664)		—
Net interest income	338,182		—		48		(15,619)		322,611
Provision for credit losses	7,495		—		—		—		7,495
Net interest income after provision for credit losses	330,687		—		48		(15,619)		315,116

Noninterest income
Wealth management fees	—		63,630		—		—		63,630
Payment technology solutions	—		—		21,983		—		21,983
Treasury management services	8,377		—		—		—		8,377
Card services and ATM fees	13,424		—		—		—		13,424
Other service charges on deposit accounts	9,440		—		—		—		9,440
All other noninterest income	20,563		1,323		—		942		22,828
Intersegment noninterest income	1,402		—		1,071		(2,473)		—
Noninterest income	53,206		64,953		23,054		(1,531)		139,682

Revenue	391,388		64,953		23,102		(17,150)		462,293

Noninterest expense
Salaries, wages, and employee benefits	117,730		26,631		10,130		21,128		175,619
Data processing	20,631		2,263		3,692		538		27,124
Amortization of intangible assets	8,916		1,141		—		—		10,057
Interchange expense	—		—		6,001		—		6,001
All other noninterest expense	67,528		2,836		2,736		9,593		82,693
Intersegment noninterest expense	11,457		3,096		1,443		(15,996)		—
Noninterest expense	226,262		35,967		24,002		15,263		301,494

Income (loss) before income taxes	157,631		28,986		(900)		(32,413)		153,304
Income taxes	40,365		6,956		(230)		(7,478)		39,613
Net income	$	117,266	$	22,030	$	(670)	$	(24,935)	$	113,691


	Year Ended December 31, 2023
	Banking		Wealth Management		FirsTech		Other		Total
Interest income	$	480,438	$	—	$	—	$	105	$	480,543
Intersegment interest income	—		—		54		(54)		—
Interest expense	140,917		—		—		19,005		159,922
Intersegment interest expense	3,006		—		—		(3,006)		—
Net interest income	336,515		—		54		(15,948)		320,621
Provision for credit losses	2,860		—		—		—		2,860
Net interest income after provision for credit losses	333,655		—		54		(15,948)		317,761

Noninterest income
Wealth management fees	—		57,309		—		—		57,309
Payment technology solutions	—		—		21,192		—		21,192
Treasury management services	7,435		—		—		—		7,435
Card services and ATM fees	12,305		—		—		—		12,305
Other service charges on deposit accounts	10,134		—		—		—		10,134
All other noninterest income	14,507		514		—		(2,182)		12,839
Intersegment noninterest income	1,149		—		1,554		(2,703)		—
Noninterest income	45,530		57,823		22,746		(4,885)		121,214

Revenue	382,045		57,823		22,800		(20,833)		441,835

Noninterest expense
Salaries, wages, and employee benefits	111,834		24,474		8,522		17,767		162,597
Data processing	18,217		1,937		3,013		541		23,708
Amortization of intangible assets	8,963		1,469		—		—		10,432
Interchange expense	—		—		6,864		—		6,864
All other noninterest expense	70,798		2,503		2,154		6,015		81,470
Intersegment noninterest expense	13,178		2,698		1,100		(16,976)		—
Noninterest expense	222,990		33,081		21,653		7,347		285,071

Income (loss) before income taxes	156,195		24,742		1,147		(28,180)		153,904
Income taxes	32,342		5,938		317		(7,258)		31,339
Net income	$	123,853	$	18,804	$	830	$	(20,922)	$	122,565

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/exampleRef
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Reference 14: http://www.xbrl.org/2003/role/exampleRef
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+ Details

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

12 Months Ended

Dec. 31, 2025

Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Alternative [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table summarizes changes AOCI by component, net of tax:


(dollars in thousands)	Unrealized Gains (Losses) on Debt Securities Available For Sale		Unrecognized Gains (Losses) on Debt Securities Held to Maturity		Unrealized Gains (Losses) on Cash Flow Hedges		Total
Balance, December 31, 2022	$	(222,394)	$	(29,899)	$	(20,985)	$	(273,278)
Unrealized holding gains (losses), net	41,824		—		(1,835)		39,989

Amounts reclassified from AOCI, net	3,934		—		6,126		10,060
Amortization of unrecognized losses on securities transferred to held to maturity	—		4,426		—		4,426
Balance, December 31, 2023	(176,636)		(25,473)		(16,694)		(218,803)
Unrealized holding gains (losses), net	6,509		—		(10,790)		(4,281)

Amounts reclassified from AOCI, net	4,447		—		7,679		12,126
Amortization of unrecognized losses on securities transferred to held to maturity	—		3,919		—		3,919
Balance, December 31, 2024	(165,680)		(21,554)		(19,805)		(207,039)
Unrealized holding gains (losses), net	55,863		—		5,919		61,782

Amounts reclassified from AOCI, net	11,124		—		6,270		17,394
Amortization of unrecognized losses on securities transferred to held to maturity	—		3,390		—		3,390
Balance, December 31, 2025	$	(98,693)	$	(18,164)	$	(7,616)	$	(124,473)

OPERATING SEGMENTS AND RELATED INFORMATION - Narrative (Details)	12 Months Ended
	Dec. 31, 2025 segment bankingCenter
Segment Reporting [Abstract]
Number of reportable segments	3
Number of operating segments	3
Number of full-service locations \| bankingCenter	79

EMPLOYEE BENEFIT PLANS - Schedule of Expenses Related to the Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
401(k) Plan expenses
Total 401(k) Plan expenses	$ 11,175	$ 7,856	$ 6,776
Safe harbor match expenses
401(k) Plan expenses
Total 401(k) Plan expenses	6,261	4,486	3,745
Profit-sharing expenses
401(k) Plan expenses
Total 401(k) Plan expenses	$ 4,914	$ 3,370	$ 3,031

Cover Page - USD ($) $ in Millions	12 Months Ended
Cover Page - USD ($) $ in Millions	Dec. 31, 2025	Feb. 26, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	0-15950
Entity Registrant Name	FIRST BUSEY CORPORATION
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	37-1078406
Entity Address, Address Line One	11440 Tomahawk Creek Parkway
Entity Address, City or Town	Leawood
Entity Address, State or Province	KS
Entity Address, Postal Zip Code	66211
City Area Code	217
Local Phone Number	365-4544
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 1,950
Entity Common Stock, Shares Outstanding		86,227,449
Documents Incorporated by Reference	Portions of the definitive Proxy Statement for the 2026 Annual Meeting of Stockholders of First Busey Corporation to be held May 20, 2026, are incorporated by reference in this Form 10-K in response to Part III.
Entity Central Index Key	0000314489
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock ($0.001 par value)
Document Information [Line Items]
Title of 12(b) Security	Common Stock ($0.001 par value)
Trading Symbol	BUSE
Security Exchange Name	NASDAQ
Depositary Shares, each representing a 1/40th interest in a share of 8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock, $0.001 par value
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/40th interest in a share of 8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock
Trading Symbol	BUSEP
Security Exchange Name	NASDAQ

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows provided by (used in) operating activities
Net income	$ 135,262	$ 113,691	$ 122,565
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	52,743	7,495	2,860
Amortization of intangible assets	16,614	10,057	10,432
Amortization of mortgage servicing rights	663	997	2,785
Amortization of New Markets Tax Credit	0	0	8,999
Depreciation and amortization of premises and equipment	12,926	9,503	9,488
Net amortization (accretion) on portfolio loans	(17,221)	4,372	6,971
Net amortization (accretion) of premium (discount) on investment securities	1,457	8,857	14,406
Net amortization (accretion) of premium (discount) on time deposits	(1,710)	101	(270)
Net amortization (accretion) of premium (discount) on FHLB advances and other borrowings	1,938	1,158	1,027
Impairment of OREO and other repossessed assets	422	0	100
Impairment of fixed assets held for sale	286	637	0
Impairment of mortgage servicing rights	154	0	1
Impairment of leases	28	0	0
Unrealized (gains) losses recognized on equity securities, net	(4,516)	(931)	2,171
(Gain) loss on sales of equity securities, net	0	0	(5,475)
(Gain) loss on sales of debt securities, net	15,242	7,033	5,503
(Gain) loss on sales of mortgage servicing rights	0	(7,724)	0
(Gain) loss on sales of loans, net	(1,680)	(1,761)	(733)
(Gain) loss on sales of OREO and other repossessed assets	(302)	(585)	(46)
(Gain) loss on sales of premises and equipment	(2)	(138)	(450)
(Gain) loss on life insurance proceeds	(508)	(895)	(759)
Increase in cash surrender value of bank owned life insurance	(6,089)	(4,235)	(3,942)
Provision for deferred income taxes	8,074	1,384	(2,920)
Stock-based compensation	17,120	7,726	6,595
Proceeds from the sale of mortgage servicing rights	0	9,796	0
Mortgage loans originated for sale	(106,092)	(104,176)	(35,413)
Proceeds from sales of mortgage loans	105,280	104,670	35,018
(Increase) decrease in other assets	(10,319)	19,752	(17,888)
Increase (decrease) in other liabilities	(27,199)	(8,517)	12,365
Net cash provided by operating activities	192,571	178,267	173,390
Cash flows provided by (used in) investing activities
Purchases of equity securities	(919)	(30,422)	(6,617)
Purchases of debt securities available for sale	(546,278)	(182,603)	(10,436)
Proceeds from sales of equity securities	6,487	25,303	11,644
Proceeds from sales of debt securities available for sale	531,795	101,361	105,044
Proceeds from paydowns and maturities of debt securities held to maturity	82,643	48,822	48,927
Proceeds from paydowns and maturities of debt securities available for sale	464,828	370,774	326,252
Purchases of restricted bank stock	(35,278)	(43,954)	(30,957)
Proceeds from the redemption of restricted bank stock	11,905	884	43,926
Purchases of loans	(116,761)	(14,602)	0
Net decrease in loans	305,623	364,455	65,240
Net cash received in acquisitions (see Note 2)	385,804	18,377	0
Cash paid for premiums on bank-owned life insurance	(46)	(74)	(80)
Proceeds from life insurance	4,485	3,092	2,292
Purchases of premises and equipment	(19,618)	(6,430)	(9,533)
Proceeds from disposition of premises and equipment	936	2,247	4,425
Net proceeds from OREO and other repossessed assets	21,958	673	860
Net cash provided by investing activities	1,097,564	657,903	550,987
Cash flows provided by (used in) financing activities
Net increase (decrease) in deposits	(1,646,521)	(701,605)	220,146
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase	11,319	(32,969)	(42,410)
Proceeds from short-term borrowings	60,000
Repayment of short-term borrowings	(71,158)	(36,000)	(335,000)
Proceeds from other borrowings, net of debt issuance costs	40,000	0	0
Repayment of other borrowings	(129,172)	(31,450)	(16,054)
Cash dividends paid	(90,989)	(54,169)	(53,076)
Purchase of treasury stock	(69,859)	0	(4,482)
Cash paid for withholding taxes on stock-based payments	(5,282)	(1,755)	(1,093)
Proceeds from (cash paid for) the exercise of stock options, warrants, and SSARs	(452)	(3)	9
Issuance of treasury stock for the ESPP	1,845	0	0
Issuance of preferred stock, net of stock issuance costs	207,447	0	0
Common stock issuance costs	(920)	(141)	0
Net cash used in financing activities	(1,693,742)	(858,092)	(231,960)
Net increase (decrease) in cash and cash equivalents	(403,607)	(21,922)	492,417
Cash and cash equivalents, beginning of period	697,659	719,581	227,164
Cash and cash equivalents, ending of period	294,052	697,659	719,581
Cash payments for:
Interest	320,008	208,359	135,482
Non-cash investing and financing activities:
OREO and other repossessed assets acquired in settlement of loans	22,772	26	189
Transfer of loans held for sale to portfolio loans	$ 359	$ 0	$ 0

TAX CREDIT INVESTMENTS AND OTHER INVESTMENTS IN UNCONSOLIDATED ENTITIES

12 Months Ended

Dec. 31, 2025

Investments, All Other Investments [Abstract]

TAX CREDIT INVESTMENTS AND OTHER INVESTMENTS IN UNCONSOLIDATED ENTITIES

NOTE 14. TAX CREDIT INVESTMENTS AND OTHER INVESTMENTS IN UNCONSOLIDATED ENTITIES


		As of December 31,
(dollars in thousands)	Location	2025		2024
Investments in unconsolidated entities
Tax credit investments	Other assets	$	119,634	$	104,635
Other investments in unconsolidated entities	Other assets	46,361		27,371
Investments in unconsolidated entities		$	165,995	$	132,006

Unfunded investment obligations	Other liabilities	$	68,690	$	61,210

Busey applies the proportional amortization method in accounting for investments in tax-advantaged projects. Income tax credits and other benefits related to these investments, along with investment amortization, are included as a component of Busey’s estimated annual effective tax rate used for the calculation of income taxes presented on the Consolidated Statements of Income. Actual amounts of income tax credits and other benefits, along with investment amortization, are presented in the table below.


	Years Ended December 31,
(dollars in thousands)	2025		2024
Income tax credits and other tax benefits	$	17,676	$	20,734
Amortization of investments in tax-advantaged projects	15,735		18,494

For additional information about Busey’s accounting policies related to tax credit investments and other investments in unconsolidated entities, see “Tax Credit Investments and Other Investments in Unconsolidated Entities” in “Note 1. Significant Accounting Policies.”

PORTFOLIO LOANS - Loans with Subsequent Defaults (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Payment Deferral
Distributions of portfolio loans
Loans with Subsequent Defaults	$ 460
Term Extension
Distributions of portfolio loans
Loans with Subsequent Defaults	3,261	$ 15,000	$ 88
Commercial loans \| C&I and other commercial \| Payment Deferral
Distributions of portfolio loans
Loans with Subsequent Defaults	460
Commercial loans \| C&I and other commercial \| Term Extension
Distributions of portfolio loans
Loans with Subsequent Defaults	3,261	0	88
Commercial loans \| CRE \| Payment Deferral
Distributions of portfolio loans
Loans with Subsequent Defaults	0
Commercial loans \| CRE \| Term Extension
Distributions of portfolio loans
Loans with Subsequent Defaults	$ 0	$ 15,000	$ 0