LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	$ 2,870,871	$ 3,483,295
Current fiscal year, writeoff	14,338
Year 2	2,546,512	2,680,834
Fiscal year before current fiscal year, writeoff	4,012
Year 3	2,063,941	1,843,080
Two years before current fiscal year, writeoff	1,350
Year 4	1,410,944	686,065
Three years before current fiscal year, writeoff	5,894
Year 5	529,690	385,461
Four years before current fiscal year, writeoff	338
Prior	892,018	828,159
More than Five years before current fiscal year, writeoff	2,107
Revolving loans amortized cost basis	2,164,828	2,084,096
Revolving loans amortized cost basis writeoff	0
Revolving loans converted to term	7,223	12,904
Revolving loans converted to term, writeoff	0
Loans	12,486,027	12,003,894
Total, writeoff	28,039
Commercial and industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	1,223,491	1,094,363
Current fiscal year, writeoff	13,973
Year 2	498,757	576,080
Fiscal year before current fiscal year, writeoff	2,711
Year 3	272,427	159,416
Two years before current fiscal year, writeoff	576
Year 4	93,854	131,332
Three years before current fiscal year, writeoff	5,665
Year 5	52,403	48,822
Four years before current fiscal year, writeoff	78
Prior	46,773	48,058
More than Five years before current fiscal year, writeoff	261
Revolving loans amortized cost basis	1,483,039	1,373,714
Revolving loans amortized cost basis writeoff	0
Revolving loans converted to term	204	5,341
Revolving loans converted to term, writeoff	0
Loans	3,670,948	3,437,126
Total, writeoff	23,264
Commercial and industrial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	1,175,967	1,064,687
Year 2	474,601	531,504
Year 3	253,148	141,985
Year 4	86,226	114,999
Year 5	47,910	43,136
Prior	45,020	45,310
Revolving loans amortized cost basis	1,393,756	1,302,562
Revolving loans converted to term	60	5,048
Loans	3,476,688	3,249,231
Commercial and industrial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	34,356	2,164
Year 2	3,911	18,005
Year 3	1,546	11,900
Year 4	5,149	5,727
Year 5	2,986	1,012
Prior	241	2,181
Revolving loans amortized cost basis	45,994	27,702
Revolving loans converted to term	0	150
Loans	94,183	68,841
Commercial and industrial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	12,311	27,512
Year 2	20,245	26,571
Year 3	17,733	5,531
Year 4	2,479	10,606
Year 5	1,507	4,674
Prior	1,512	567
Revolving loans amortized cost basis	40,449	43,450
Revolving loans converted to term	144	143
Loans	96,380	119,054
Commercial and industrial loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	857
Year 2	0
Year 3	0
Year 4	0
Year 5	0
Prior	0
Revolving loans amortized cost basis	2,840
Revolving loans converted to term	0
Loans	3,697
Agricultural land, production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	35,691	44,910
Current fiscal year, writeoff	0
Year 2	38,561	37,083
Fiscal year before current fiscal year, writeoff	0
Year 3	31,511	36,281
Two years before current fiscal year, writeoff	0
Year 4	31,502	15,296
Three years before current fiscal year, writeoff	0
Year 5	12,995	4,127
Four years before current fiscal year, writeoff	0
Prior	25,620	30,694
More than Five years before current fiscal year, writeoff	0
Revolving loans amortized cost basis	87,534	73,402
Revolving loans amortized cost basis writeoff	0
Revolving loans converted to term	0	0
Revolving loans converted to term, writeoff	0
Loans	263,414	241,793
Total, writeoff	0
Agricultural land, production and other loans to farmers | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	35,633	44,446
Year 2	38,145	36,299
Year 3	31,511	35,791
Year 4	31,048	15,296
Year 5	12,995	3,752
Prior	25,462	28,910
Revolving loans amortized cost basis	87,534	73,402
Revolving loans converted to term	0	0
Loans	262,328	237,896
Agricultural land, production and other loans to farmers | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	0	286
Year 2	266	784
Year 3	0	0
Year 4	0	0
Year 5	0	281
Prior	122	632
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans	388	1,983
Agricultural land, production and other loans to farmers | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	58	178
Year 2	150	0
Year 3	0	490
Year 4	454	0
Year 5	0	94
Prior	36	1,152
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans	698	1,914
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	430,923	383,367
Current fiscal year, writeoff	0
Year 2	271,917	301,986
Fiscal year before current fiscal year, writeoff	0
Year 3	203,672	117,541
Two years before current fiscal year, writeoff	0
Year 4	29,218	11,428
Three years before current fiscal year, writeoff	0
Year 5	7,723	857
Four years before current fiscal year, writeoff	0
Prior	2,357	3,236
More than Five years before current fiscal year, writeoff	0
Revolving loans amortized cost basis	11,735	17,167
Revolving loans amortized cost basis writeoff	0
Revolving loans converted to term	0	0
Revolving loans converted to term, writeoff	0
Loans	957,545	835,582
Total, writeoff	0
Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	403,578	366,414
Year 2	267,587	301,986
Year 3	198,350	117,541
Year 4	8,372	11,428
Year 5	7,723	857
Prior	2,357	3,224
Revolving loans amortized cost basis	11,735	17,167
Revolving loans converted to term	0	0
Loans	899,702	818,617
Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	25,894	16,922
Year 2	0	0
Year 3	0	0
Year 4	20,846	0
Year 5	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans	46,740	16,922
Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	1,451	31
Year 2	4,330	0
Year 3	5,322	0
Year 4	0	0
Year 5	0	0
Prior	0	12
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans	11,103	43
Commercial real estate, non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	470,118	630,708
Current fiscal year, writeoff	0
Year 2	535,962	615,408
Fiscal year before current fiscal year, writeoff	66
Year 3	542,551	596,899
Two years before current fiscal year, writeoff	0
Year 4	443,320	187,486
Three years before current fiscal year, writeoff	0
Year 5	160,799	132,847
Four years before current fiscal year, writeoff	0
Prior	231,061	209,128
More than Five years before current fiscal year, writeoff	0
Revolving loans amortized cost basis	17,028	31,196
Revolving loans amortized cost basis writeoff	0
Revolving loans converted to term	0	3,803
Revolving loans converted to term, writeoff	0
Loans	2,400,839	2,407,475
Total, writeoff	66
Commercial real estate, non-owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	373,378	560,146
Year 2	504,280	603,254
Year 3	535,327	550,605
Year 4	418,553	168,701
Year 5	141,320	116,859
Prior	200,821	190,264
Revolving loans amortized cost basis	16,744	31,196
Revolving loans converted to term	0	3,803
Loans	2,190,423	2,224,828
Commercial real estate, non-owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	76,382	49,439
Year 2	21,145	4,026
Year 3	7,005	38,268
Year 4	4,531	18,785
Year 5	19,479	11,546
Prior	27,941	17,992
Revolving loans amortized cost basis	37	0
Revolving loans converted to term	0	0
Loans	156,520	140,056
Commercial real estate, non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	20,358	21,123
Year 2	10,537	8,128
Year 3	219	8,026
Year 4	20,236	0
Year 5	0	4,442
Prior	2,299	872
Revolving loans amortized cost basis	247	0
Revolving loans converted to term	0	0
Loans	53,896	42,591
Commercial real estate, owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	201,554	271,593
Current fiscal year, writeoff	48
Year 2	208,567	324,004
Fiscal year before current fiscal year, writeoff	0
Year 3	269,848	335,062
Two years before current fiscal year, writeoff	0
Year 4	270,527	119,104
Three years before current fiscal year, writeoff	0
Year 5	100,388	67,946
Four years before current fiscal year, writeoff	2
Prior	83,316	90,990
More than Five years before current fiscal year, writeoff	0
Revolving loans amortized cost basis	27,883	34,451
Revolving loans amortized cost basis writeoff	0
Revolving loans converted to term	0	3,378
Revolving loans converted to term, writeoff	0
Loans	1,162,083	1,246,528
Total, writeoff	50
Commercial real estate, owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	176,750	260,725
Year 2	199,821	316,665
Year 3	256,346	330,441
Year 4	263,522	114,015
Year 5	99,180	63,816
Prior	77,485	81,286
Revolving loans amortized cost basis	27,369	33,123
Revolving loans converted to term	0	3,378
Loans	1,100,473	1,203,449
Commercial real estate, owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	6,712	7,744
Year 2	5,034	6,125
Year 3	9,319	2,245
Year 4	2,460	3,481
Year 5	919	1,210
Prior	2,902	2,984
Revolving loans amortized cost basis	514	1,328
Revolving loans converted to term	0	0
Loans	27,860	25,117
Commercial real estate, owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	18,092	3,124
Year 2	3,712	1,214
Year 3	4,183	2,376
Year 4	4,545	1,608
Year 5	289	2,920
Prior	2,929	6,720
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans	33,750	17,962
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	398,334	762,399
Current fiscal year, writeoff	101
Year 2	704,355	494,049
Fiscal year before current fiscal year, writeoff	252
Year 3	448,226	405,136
Two years before current fiscal year, writeoff	208
Year 4	368,420	115,738
Three years before current fiscal year, writeoff	3
Year 5	100,585	79,632
Four years before current fiscal year, writeoff	3
Prior	263,618	234,141
More than Five years before current fiscal year, writeoff	94
Revolving loans amortized cost basis	5,219	5,459
Revolving loans amortized cost basis writeoff	0
Revolving loans converted to term	164	101
Revolving loans converted to term, writeoff	0
Loans	2,288,921	2,096,655
Total, writeoff	661
Residential | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	395,363	758,161
Year 2	695,056	489,301
Year 3	442,495	401,353
Year 4	365,297	114,420
Year 5	98,654	77,768
Prior	254,718	229,812
Revolving loans amortized cost basis	4,988	5,365
Revolving loans converted to term	83	46
Loans	2,256,654	2,076,226
Residential | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	2,167	2,839
Year 2	5,591	2,924
Year 3	3,202	1,972
Year 4	1,924	513
Year 5	1,065	396
Prior	4,837	2,588
Revolving loans amortized cost basis	200	34
Revolving loans converted to term	81	0
Loans	19,067	11,266
Residential | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	804	1,399
Year 2	3,708	1,824
Year 3	2,529	1,811
Year 4	1,199	805
Year 5	866	1,468
Prior	4,063	1,741
Revolving loans amortized cost basis	31	60
Revolving loans converted to term	0	55
Loans	13,200	9,163
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	9,438	40,768
Current fiscal year, writeoff	69
Year 2	30,499	75,749
Fiscal year before current fiscal year, writeoff	213
Year 3	62,318	14,621
Two years before current fiscal year, writeoff	224
Year 4	12,176	1,572
Three years before current fiscal year, writeoff	149
Year 5	1,107	1,528
Four years before current fiscal year, writeoff	193
Prior	4,000	3,393
More than Five years before current fiscal year, writeoff	1,596
Revolving loans amortized cost basis	491,950	492,720
Revolving loans amortized cost basis writeoff	0
Revolving loans converted to term	6,083	281
Revolving loans converted to term, writeoff	0
Loans	617,571	630,632
Total, writeoff	2,444
Home equity | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	9,375	40,768
Year 2	29,784	75,670
Year 3	61,591	14,621
Year 4	11,084	1,572
Year 5	1,092	1,348
Prior	3,875	3,325
Revolving loans amortized cost basis	484,330	486,924
Revolving loans converted to term	5,837	281
Loans	606,968	624,509
Home equity | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	0	0
Year 2	715	0
Year 3	0	0
Year 4	1,092	0
Year 5	15	115
Prior	2	8
Revolving loans amortized cost basis	5,031	3,698
Revolving loans converted to term	149	0
Loans	7,004	3,821
Home equity | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	63	0
Year 2	0	79
Year 3	727	0
Year 4	0	0
Year 5	0	65
Prior	123	60
Revolving loans amortized cost basis	2,589	2,098
Revolving loans converted to term	97	0
Loans	3,599	2,302
Individuals' loans for household and other personal expenditures
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	35,965	68,062
Current fiscal year, writeoff	147
Year 2	49,547	43,773
Fiscal year before current fiscal year, writeoff	770
Year 3	28,525	13,105
Two years before current fiscal year, writeoff	342
Year 4	6,795	5,422
Three years before current fiscal year, writeoff	77
Year 5	2,071	5,942
Four years before current fiscal year, writeoff	62
Prior	5,918	3,800
More than Five years before current fiscal year, writeoff	156
Revolving loans amortized cost basis	38,795	35,107
Revolving loans amortized cost basis writeoff	0
Revolving loans converted to term	772	0
Revolving loans converted to term, writeoff	0
Loans	168,388	175,211
Total, writeoff	1,554
Individuals' loans for household and other personal expenditures | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	35,781	67,883
Year 2	49,295	43,639
Year 3	28,387	13,025
Year 4	6,726	5,389
Year 5	2,070	5,830
Prior	5,904	3,775
Revolving loans amortized cost basis	38,619	35,091
Revolving loans converted to term	772	0
Loans	167,554	174,632
Individuals' loans for household and other personal expenditures | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	184	178
Year 2	246	134
Year 3	138	77
Year 4	69	33
Year 5	0	28
Prior	14	17
Revolving loans amortized cost basis	176	16
Revolving loans converted to term	0	0
Loans	827	483
Individuals' loans for household and other personal expenditures | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	0	1
Year 2	6	0
Year 3	0	3
Year 4	0	0
Year 5	1	84
Prior	0	8
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans	7	96
Public finance and other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	65,357	187,125
Year 2	208,347	212,702
Year 3	204,863	165,019
Year 4	155,132	98,687
Year 5	91,619	43,760
Prior	229,355	204,719
Revolving loans amortized cost basis	1,645	20,880
Revolving loans converted to term	0	0
Loans	956,318	932,892
Public finance and other commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year 1	65,357	187,125
Year 2	208,347	212,702
Year 3	204,863	165,019
Year 4	155,132	98,687
Year 5	91,619	43,760
Prior	229,355	204,719
Revolving loans amortized cost basis	1,645	20,880
Revolving loans converted to term	0	0
Loans	$ 956,318	$ 932,892