LOANS AND ALLOWANCE FOR CREDIT LOSSES - Amortized Cost of the Loan Portfolio, by Year of Origination, Loan Class, and Credit Quality (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	$ 4,061,319	$ 4,020,693
Commercial Real Estate \| Owner occupied
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	14,653	96,640
Year two	98,653	58,317
Year three	57,895	92,785
Year four	90,344	109,166
Year five	106,145	101,569
Prior	260,158	167,671
Revolving Loans Amortized Basis	13,486	14,853
Revolving Loans Converted to Term	3,692	3,712
Total	645,026	644,713
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	337
Year five	0	0
Prior	0	3
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	340
Commercial Real Estate \| Non-owner occupied
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	98,893	174,958
Year two	164,480	92,343
Year three	89,017	137,116
Year four	136,322	192,963
Year five	190,318	305,702
Prior	632,451	348,072
Revolving Loans Amortized Basis	9,773	9,044
Revolving Loans Converted to Term	997	0
Total	1,322,251	1,260,198
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Commercial Real Estate \| Multi-family
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	3,023	15,347
Year two	14,139	9,283
Year three	9,223	6,800
Year four	6,767	86,174
Year five	85,845	46,018
Prior	96,613	71,549
Revolving Loans Amortized Basis	1,001	860
Revolving Loans Converted to Term	47	672
Total	216,658	236,703
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Commercial Real Estate \| Non-owner occupied residential
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	2,535	9,829
Year two	10,717	9,947
Year three	8,844	17,961
Year four	17,140	27,063
Year five	26,365	27,707
Prior	85,487	62,479
Revolving Loans Amortized Basis	92	479
Revolving Loans Converted to Term	380	284
Total	151,560	155,749
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	37	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	37	0
Acquisition and development \| 1-4 family residential construction
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	4,082	32,602
Year two	33,460	5,145
Year three	2,737	2,408
Year four	4,747	411
Year five	411	923
Prior	918	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	46,355	41,489
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Acquisition and development \| Commercial and land development
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	2,676	29,243
Year two	31,550	53,272
Year three	55,823	32,392
Year four	27,600	65,416
Year five	63,458	5,649
Prior	8,175	3,213
Revolving Loans Amortized Basis	9,675	9,049
Revolving Loans Converted to Term	0	0
Total	198,957	198,234
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	85	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	85	0
Agricultural
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	5,699	12,698
Year two	12,161	10,186
Year three	8,552	13,676
Year four	11,847	20,679
Year five	19,204	18,332
Prior	40,330	29,344
Revolving Loans Amortized Basis	15,193	15,779
Revolving Loans Converted to Term	1,423	723
Total	114,409	121,417
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	25
Prior	0	6
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	31
Commercial and Industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	14,110	76,917
Year two	73,509	88,147
Year three	85,878	46,104
Year four	38,224	45,952
Year five	36,854	42,579
Prior	63,308	22,110
Revolving Loans Amortized Basis	162,679	156,355
Revolving Loans Converted to Term	7,253	11,207
Total	481,815	489,371
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	406
Year four	0	175
Year five	0	56
Prior	677	100
Revolving Loans Amortized Basis	122	499
Revolving Loans Converted to Term	0	0
Total	799	1,236
Municipal
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	3,008	0
Year two	1	55
Year three	52	0
Year four	0	9,012
Year five	8,811	2,841
Prior	15,872	13,394
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	27,744	25,302
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Residential mortgage \| First lien
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	15,705	74,268
Year two	72,561	55,085
Year three	54,453	90,500
Year four	88,180	92,787
Year five	91,210	47,041
Prior	161,913	119,189
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	484,022	478,870
Current Period Gross Charge-offs
Year one	0	0
Year two	0	51
Year three	0	0
Year four	0	0
Year five	0	27
Prior	0	10
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	88
Residential mortgage \| First lien \| Performing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	15,705	74,268
Year two	72,561	54,459
Year three	53,828	89,440
Year four	87,146	92,611
Year five	90,739	46,907
Prior	157,683	114,926
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	477,662	472,611
Residential mortgage \| First lien \| Nonperforming
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	0	0
Year two	0	626
Year three	625	1,060
Year four	1,034	176
Year five	471	134
Prior	4,230	4,263
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	6,360	6,259
Residential mortgage \| Home equity - term
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	204	1,102
Year two	770	319
Year three	326	576
Year four	584	894
Year five	872	172
Prior	2,929	2,909
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	5,685	5,972
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	36
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	36
Residential mortgage \| Home equity - term \| Performing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	204	1,015
Year two	692	319
Year three	326	576
Year four	584	894
Year five	872	172
Prior	2,871	2,814
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	5,549	5,790
Residential mortgage \| Home equity - term \| Nonperforming
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	0	87
Year two	78	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	58	95
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	136	182
Residential mortgage \| Home equity - lines of credit
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	235,301	223,812
Revolving Loans Converted to Term	91,840	97,626
Total	327,141	321,438
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	23
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	23
Residential mortgage \| Home equity - lines of credit \| Performing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	233,882	223,787
Revolving Loans Converted to Term	90,067	94,178
Total	323,949	317,965
Residential mortgage \| Home equity - lines of credit \| Nonperforming
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	1,419	25
Revolving Loans Converted to Term	1,773	3,448
Total	3,192	3,473
Residential mortgage \| Other - term
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	0	0
Year two	0	22,906
Year three	22,442	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	22,442	22,906
Current Period Gross Charge-offs
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Residential mortgage \| Other - term \| Performing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	0	0
Year two	0	22,906
Year three	22,442	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	22,442	22,906
Residential mortgage \| Other - term \| Nonperforming
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Installment and other loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	582	1,186
Year two	490	1,052
Year three	932	1,427
Year four	1,170	1,153
Year five	902	345
Prior	390	213
Revolving Loans Amortized Basis	12,782	12,930
Revolving Loans Converted to Term	6	25
Total	17,254	18,331
Current Period Gross Charge-offs
Year one	0	453
Year two	91	234
Year three	2	6
Year four	0	8
Year five	0	4
Prior	0	15
Revolving Loans Amortized Basis	4	74
Revolving Loans Converted to Term	0	0
Total	97	794
Installment and other loans \| Performing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	582	1,186
Year two	490	1,052
Year three	932	1,425
Year four	1,169	1,153
Year five	902	345
Prior	390	213
Revolving Loans Amortized Basis	12,782	12,930
Revolving Loans Converted to Term	6	25
Total	17,253	18,329
Installment and other loans \| Nonperforming
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	0	0
Year two	0	0
Year three	0	2
Year four	1	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	1	2
Pass \| Commercial Real Estate \| Owner occupied
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	14,653	96,640
Year two	98,653	46,784
Year three	45,482	88,930
Year four	83,037	103,934
Year five	100,981	90,037
Prior	236,424	152,232
Revolving Loans Amortized Basis	10,807	13,102
Revolving Loans Converted to Term	3,622	3,642
Total	593,659	595,301
Pass \| Commercial Real Estate \| Non-owner occupied
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	98,893	174,958
Year two	164,480	92,343
Year three	89,017	126,924
Year four	126,145	188,935
Year five	186,293	305,539
Prior	622,613	338,309
Revolving Loans Amortized Basis	9,773	9,044
Revolving Loans Converted to Term	997	0
Total	1,298,211	1,236,052
Pass \| Commercial Real Estate \| Multi-family
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	3,023	15,347
Year two	14,139	9,283
Year three	9,223	6,800
Year four	6,767	77,290
Year five	76,915	45,263
Prior	95,866	71,549
Revolving Loans Amortized Basis	1,001	860
Revolving Loans Converted to Term	47	672
Total	206,981	227,064
Pass \| Commercial Real Estate \| Non-owner occupied residential
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	2,535	9,829
Year two	10,717	9,460
Year three	8,844	17,833
Year four	17,013	26,227
Year five	25,575	24,378
Prior	79,809	59,928
Revolving Loans Amortized Basis	92	479
Revolving Loans Converted to Term	244	146
Total	144,829	148,280
Pass \| Acquisition and development \| 1-4 family residential construction
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	4,082	32,602
Year two	33,460	5,145
Year three	2,737	2,408
Year four	4,747	411
Year five	411	923
Prior	918	0
Revolving Loans Amortized Basis	0	0
Revolving Loans Converted to Term	0	0
Total	46,355	41,489
Pass \| Acquisition and development \| Commercial and land development
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	2,676	29,243
Year two	31,550	53,272
Year three	55,734	27,951
Year four	23,169	57,777
Year five	56,015	5,319
Prior	7,791	3,213
Revolving Loans Amortized Basis	9,675	9,049
Revolving Loans Converted to Term	0	0
Total	186,610	185,824
Pass \| Agricultural
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	5,699	12,698
Year two	12,161	8,621
Year three	8,485	12,006
Year four	11,827	19,421
Year five	19,178	17,013
Prior	38,861	25,466
Revolving Loans Amortized Basis	14,947	15,533
Revolving Loans Converted to Term	1,423	723
Total	112,581	111,481
Pass \| Commercial and Industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	14,110	76,830
Year two	65,462	80,815
Year three	78,382	36,440
Year four	28,464	45,357
Year five	36,308	40,702
Prior	60,971	20,836
Revolving Loans Amortized Basis	143,123	137,914
Revolving Loans Converted to Term	4,059	8,209
Total	430,879	447,103
Pass \| Municipal
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one	3,008	0
Year two	1	55
Year three	52	0

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Amortized Cost of the Loan Portfolio, by Year of Origination, Loan Class, and Credit Quality (Details) - USD ($)
$ in Thousands