LOANS AND ALLOWANCE FOR CREDIT LOSSES - Risk Grading of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	$ 824,858	$ 2,869,611
Current fiscal year, charge-offs	0	1,450
Fiscal year before current fiscal year	2,590,012	1,733,843
Fiscal year before current fiscal year, charge-offs	801	40,529
Two years before current fiscal year	1,636,520	1,937,367
Two years before current fiscal year, charge-offs	1,382	1,681
Three years before current fiscal year	1,851,545	1,569,313
Three years before current fiscal year, charge-offs	467	8,947
Four years before current fiscal year	1,477,084	1,142,386
Four years before current fiscal year, charge-offs	3,142	576
Prior	2,136,306	1,139,559
Prior, charge-offs	390	1,060
Revolving loans amortized cost basis	2,486,297	2,447,911
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	2,283	14,369
Revolving loans converted to term, charge-offs	0	0
Total	13,004,905	12,854,359
Total, charge-offs	6,182	54,243
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	449,752	1,359,867
Current fiscal year, charge-offs	0	1,242
Fiscal year before current fiscal year	1,207,288	539,311
Fiscal year before current fiscal year, charge-offs	630	39,087
Two years before current fiscal year	465,945	244,687
Two years before current fiscal year, charge-offs	1,040	341
Three years before current fiscal year	214,085	166,561
Three years before current fiscal year, charge-offs	16	8,605
Four years before current fiscal year	148,033	58,942
Four years before current fiscal year, charge-offs	3,094	500
Prior	95,609	51,036
Prior, charge-offs	87	424
Revolving loans amortized cost basis	1,725,885	1,693,245
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	0	643
Revolving loans converted to term, charge-offs	0	0
Total	4,306,597	4,114,292
Total, charge-offs	4,867	50,199
Commercial and industrial loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	431,109	1,314,174
Fiscal year before current fiscal year	1,184,550	493,138
Two years before current fiscal year	441,048	196,877
Three years before current fiscal year	165,738	158,215
Four years before current fiscal year	142,290	55,639
Prior	91,465	49,554
Revolving loans amortized cost basis	1,614,342	1,576,409
Revolving loans converted to term	0	130
Total	4,070,542	3,844,136
Commercial and industrial loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	138	14,982
Fiscal year before current fiscal year	6,225	13,282
Two years before current fiscal year	6,271	20,837
Three years before current fiscal year	21,724	1,097
Four years before current fiscal year	823	2,222
Prior	2,286	348
Revolving loans amortized cost basis	44,753	41,187
Revolving loans converted to term	0	0
Total	82,220	93,955
Commercial and industrial loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	18,505	29,238
Fiscal year before current fiscal year	14,539	32,285
Two years before current fiscal year	18,614	26,973
Three years before current fiscal year	26,623	7,249
Four years before current fiscal year	3,570	1,081
Prior	1,281	1,134
Revolving loans amortized cost basis	66,790	75,649
Revolving loans converted to term	0	513
Total	149,922	174,122
Commercial and industrial loans | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	1,473
Fiscal year before current fiscal year	1,974	606
Two years before current fiscal year	12	0
Three years before current fiscal year	0	0
Four years before current fiscal year	1,350	0
Prior	577	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	3,913	2,079
Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	19,203	31,323
Fiscal year before current fiscal year	26,763	23,118
Two years before current fiscal year	22,313	31,563
Three years before current fiscal year	30,939	27,124
Four years before current fiscal year	26,248	27,585
Prior	55,446	30,433
Revolving loans amortized cost basis	62,952	85,166
Revolving loans converted to term	0	0
Total	243,864	256,312
Agricultural land, production and other loans to farmers | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	18,823	28,600
Fiscal year before current fiscal year	24,089	23,070
Two years before current fiscal year	22,240	30,518
Three years before current fiscal year	29,683	26,442
Four years before current fiscal year	25,580	27,105
Prior	53,261	29,930
Revolving loans amortized cost basis	60,772	84,502
Revolving loans converted to term	0	0
Total	234,448	250,167
Agricultural land, production and other loans to farmers | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	169
Fiscal year before current fiscal year	159	0
Two years before current fiscal year	29	245
Three years before current fiscal year	476	0
Four years before current fiscal year	0	446
Prior	863	422
Revolving loans amortized cost basis	1,227	528
Revolving loans converted to term	0	0
Total	2,754	1,810
Agricultural land, production and other loans to farmers | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	380	2,554
Fiscal year before current fiscal year	2,515	48
Two years before current fiscal year	44	800
Three years before current fiscal year	780	682
Four years before current fiscal year	668	34
Prior	1,322	81
Revolving loans amortized cost basis	953	136
Revolving loans converted to term	0	0
Total	6,662	4,335
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	59,583	338,806
Fiscal year before current fiscal year	351,563	225,682
Two years before current fiscal year	223,438	152,105
Three years before current fiscal year	123,453	47,728
Four years before current fiscal year	13,782	6,398
Prior	11,029	8,589
Revolving loans amortized cost basis	10,327	12,836
Revolving loans converted to term	0	0
Total	793,175	792,144
Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	25,407	241,622
Fiscal year before current fiscal year	243,728	203,829
Two years before current fiscal year	200,293	114,794
Three years before current fiscal year	60,604	31,864
Four years before current fiscal year	13,178	6,398
Prior	10,994	8,549
Revolving loans amortized cost basis	10,327	12,836
Revolving loans converted to term	0	0
Total	564,531	619,892
Construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	12,176	74,879
Fiscal year before current fiscal year	97,317	21,853
Two years before current fiscal year	23,145	19,019
Three years before current fiscal year	44,557	15,214
Four years before current fiscal year	0	0
Prior	35	40
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	177,230	131,005
Construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	22,000	22,305
Fiscal year before current fiscal year	10,518	0
Two years before current fiscal year	0	18,292
Three years before current fiscal year	18,292	0
Four years before current fiscal year	604	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	51,414	40,597
Construction | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year		0
Fiscal year before current fiscal year		0
Two years before current fiscal year		0
Three years before current fiscal year		650
Four years before current fiscal year		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term		0
Total		650
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	116,249	496,934
Current fiscal year, charge-offs	0	0
Fiscal year before current fiscal year	389,909	287,464
Fiscal year before current fiscal year, charge-offs	0	339
Two years before current fiscal year	264,488	384,409
Two years before current fiscal year, charge-offs	0	3
Three years before current fiscal year	375,783	425,920
Three years before current fiscal year, charge-offs	178	0
Four years before current fiscal year	412,238	351,266
Four years before current fiscal year, charge-offs	0	0
Prior	585,183	308,160
Prior, charge-offs	15	1
Revolving loans amortized cost basis	34,019	19,863
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	0	0
Revolving loans converted to term, charge-offs	0	0
Total	2,177,869	2,274,016
Total, charge-offs	193	343
Commercial real estate, non-owner occupied | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	100,071	383,279
Fiscal year before current fiscal year	325,566	275,907
Two years before current fiscal year	250,185	342,442
Three years before current fiscal year	330,932	406,289
Four years before current fiscal year	394,174	327,372
Prior	561,031	278,362
Revolving loans amortized cost basis	33,931	19,863
Revolving loans converted to term	0	0
Total	1,995,890	2,033,514
Commercial real estate, non-owner occupied | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	3,286	79,440
Fiscal year before current fiscal year	52,913	9,051
Two years before current fiscal year	11,867	35,230
Three years before current fiscal year	38,487	12,975
Four years before current fiscal year	11,423	5,287
Prior	4,941	28,200
Revolving loans amortized cost basis	86	0
Revolving loans converted to term	0	0
Total	123,003	170,183
Commercial real estate, non-owner occupied | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	12,892	34,215
Fiscal year before current fiscal year	11,430	2,506
Two years before current fiscal year	2,436	6,737
Three years before current fiscal year	6,364	6,656
Four years before current fiscal year	6,641	18,607
Prior	19,211	1,598
Revolving loans amortized cost basis	2	0
Revolving loans converted to term	0	0
Total	58,976	70,319
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	91,871	209,900
Current fiscal year, charge-offs	0	0
Fiscal year before current fiscal year	210,357	160,646
Fiscal year before current fiscal year, charge-offs	51	0
Two years before current fiscal year	159,669	175,469
Two years before current fiscal year, charge-offs	152	0
Three years before current fiscal year	170,980	238,523
Three years before current fiscal year, charge-offs	0	0
Four years before current fiscal year	224,656	208,439
Four years before current fiscal year, charge-offs	0	9
Prior	320,632	132,934
Prior, charge-offs	5	0
Revolving loans amortized cost basis	36,574	32,033
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	0	0
Revolving loans converted to term, charge-offs	0	0
Total	1,214,739	1,157,944
Total, charge-offs	208	9
Commercial real estate, owner occupied | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	74,568	194,703
Fiscal year before current fiscal year	177,392	141,964
Two years before current fiscal year	147,507	164,725
Three years before current fiscal year	159,448	217,319
Four years before current fiscal year	213,429	198,314
Prior	308,349	127,431
Revolving loans amortized cost basis	36,114	31,573
Revolving loans converted to term	0	0
Total	1,116,807	1,076,029
Commercial real estate, owner occupied | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	481	1,887
Fiscal year before current fiscal year	15,365	11,013
Two years before current fiscal year	5,129	7,555
Three years before current fiscal year	9,712	9,910
Four years before current fiscal year	7,719	8,603
Prior	8,369	1,951
Revolving loans amortized cost basis	460	460
Revolving loans converted to term	0	0
Total	47,235	41,379
Commercial real estate, owner occupied | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	16,822	13,310
Fiscal year before current fiscal year	14,027	7,669
Two years before current fiscal year	7,033	3,189
Three years before current fiscal year	1,820	11,294
Four years before current fiscal year	3,508	1,522
Prior	3,914	3,552
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	47,124	40,536
Commercial real estate, owner occupied | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0
Fiscal year before current fiscal year	3,573
Two years before current fiscal year	0
Three years before current fiscal year	0
Four years before current fiscal year	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total	3,573
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	49,584	223,850
Current fiscal year, charge-offs	0	0
Fiscal year before current fiscal year	217,706	417,417
Fiscal year before current fiscal year, charge-offs	26	173
Two years before current fiscal year	423,225	687,790
Two years before current fiscal year, charge-offs	50	779
Three years before current fiscal year	680,705	405,283
Three years before current fiscal year, charge-offs	121	136
Four years before current fiscal year	400,067	330,261
Four years before current fiscal year, charge-offs	0	20
Prior	609,677	300,731
Prior, charge-offs	187	288
Revolving loans amortized cost basis	8,824	9,384
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	64	13
Revolving loans converted to term, charge-offs	0	0
Total	2,389,852	2,374,729
Total, charge-offs	384	1,396
Residential | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	49,584	221,016
Fiscal year before current fiscal year	215,741	413,552
Two years before current fiscal year	417,482	672,713
Three years before current fiscal year	665,752	397,192
Four years before current fiscal year	392,322	326,154
Prior	599,913	293,785
Revolving loans amortized cost basis	8,327	8,887
Revolving loans converted to term	48	13
Total	2,349,169	2,333,312
Residential | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	1,528
Fiscal year before current fiscal year	485	1,953
Two years before current fiscal year	3,581	6,228
Three years before current fiscal year	6,036	4,102
Four years before current fiscal year	3,667	2,891
Prior	4,948	3,152
Revolving loans amortized cost basis	150	150
Revolving loans converted to term	16	0
Total	18,883	20,004
Residential | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	1,306
Fiscal year before current fiscal year	1,480	1,912
Two years before current fiscal year	2,162	8,849
Three years before current fiscal year	8,917	3,989
Four years before current fiscal year	4,078	1,216
Prior	4,816	3,794
Revolving loans amortized cost basis	347	347
Revolving loans converted to term	0	0
Total	21,800	21,413
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	2,350	6,887
Current fiscal year, charge-offs	0	0
Fiscal year before current fiscal year	11,799	4,354
Fiscal year before current fiscal year, charge-offs	6	10
Two years before current fiscal year	4,193	25,757
Two years before current fiscal year, charge-offs	0	35
Three years before current fiscal year	24,292	52,413
Three years before current fiscal year, charge-offs	11	22
Four years before current fiscal year	50,563	10,783
Four years before current fiscal year, charge-offs	2	0
Prior	15,862	4,141
Prior, charge-offs	44	267
Revolving loans amortized cost basis	539,221	541,944
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	2,219	13,532
Revolving loans converted to term, charge-offs	0	0
Total	650,499	659,811
Total, charge-offs	63	334
Home equity | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	2,289	6,788
Fiscal year before current fiscal year	11,023	4,354
Two years before current fiscal year	4,193	24,810
Three years before current fiscal year	23,629	51,313
Four years before current fiscal year	49,320	10,486
Prior	14,843	3,976
Revolving loans amortized cost basis	532,713	535,132
Revolving loans converted to term	2,105	12,124
Total	640,115	648,983
Home equity | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	38
Fiscal year before current fiscal year	38	0
Two years before current fiscal year	0	375
Three years before current fiscal year	0	285
Four years before current fiscal year	467	297
Prior	36	69
Revolving loans amortized cost basis	4,069	4,568
Revolving loans converted to term	114	442
Total	4,724	6,074
Home equity | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	61	61
Fiscal year before current fiscal year	738	0
Two years before current fiscal year	0	572
Three years before current fiscal year	663	815
Four years before current fiscal year	776	0
Prior	983	96
Revolving loans amortized cost basis	2,439	2,244
Revolving loans converted to term	0	966
Total	5,660	4,754
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	14,306	40,972
Current fiscal year, charge-offs	0	208
Fiscal year before current fiscal year	25,105	22,101
Fiscal year before current fiscal year, charge-offs	88	920
Two years before current fiscal year	19,430	31,703
Two years before current fiscal year, charge-offs	140	523
Three years before current fiscal year	29,142	10,695
Three years before current fiscal year, charge-offs	141	184
Four years before current fiscal year	8,985	2,335
Four years before current fiscal year, charge-offs	46	47
Prior	5,928	4,733
Prior, charge-offs	52	80
Revolving loans amortized cost basis	38,058	53,308
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	0	181
Revolving loans converted to term, charge-offs	0	0
Total	140,954	166,028
Total, charge-offs	467	1,962
Individuals' loans for household and other personal expenditures | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	14,306	40,819
Fiscal year before current fiscal year	24,848	21,867
Two years before current fiscal year	19,061	31,356
Three years before current fiscal year	28,870	10,520
Four years before current fiscal year	8,844	2,276
Prior	5,912	4,693
Revolving loans amortized cost basis	38,013	53,180
Revolving loans converted to term	0	180
Total	139,854	164,891
Individuals' loans for household and other personal expenditures | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	153
Fiscal year before current fiscal year	257	234
Two years before current fiscal year	369	347
Three years before current fiscal year	272	175
Four years before current fiscal year	141	59
Prior	16	40
Revolving loans amortized cost basis	45	128
Revolving loans converted to term	0	0
Total	1,100	1,136
Individuals' loans for household and other personal expenditures | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year		0
Fiscal year before current fiscal year		0
Two years before current fiscal year		0
Three years before current fiscal year		0
Four years before current fiscal year		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term		1
Total		1
Public finance and other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	21,960	161,072
Fiscal year before current fiscal year	149,522	53,750
Two years before current fiscal year	53,819	203,884
Three years before current fiscal year	202,166	195,066
Four years before current fiscal year	192,512	146,377
Prior	436,940	298,802
Revolving loans amortized cost basis	30,437	132
Revolving loans converted to term	0	0
Total	1,087,356	1,059,083
Public finance and other commercial loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	21,960	161,072
Fiscal year before current fiscal year	149,522	53,750
Two years before current fiscal year	53,341	203,884
Three years before current fiscal year	202,166	195,066
Four years before current fiscal year	192,512	146,377
Prior	434,690	298,802
Revolving loans amortized cost basis	30,437	132
Revolving loans converted to term	0	0
Total	1,084,628	$ 1,059,083
Public finance and other commercial loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0
Fiscal year before current fiscal year	0
Two years before current fiscal year	478
Three years before current fiscal year	0
Four years before current fiscal year	0
Prior	2,250
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total	$ 2,728