LOANS AND ALLOWANCE - Risk Grading of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	$ 1,622,879	$ 2,870,871
Current fiscal year, charge-offs		14,338
Fiscal year before current fiscal year	2,244,226	2,546,512
Fiscal year before current fiscal year, charge-offs		4,012
Two years before current fiscal year	2,170,991	2,063,941
Two years before current fiscal year, charge-offs		1,350
Three years before current fiscal year	1,760,231	1,410,944
Three years before current fiscal year, charge-offs		5,894
Four years before current fiscal year	1,269,379	529,690
Four years before current fiscal year, charge-offs		338
Prior	1,284,424	892,018
Prior, charge-offs		2,107
Revolving loans amortized cost basis	2,280,064	2,164,828
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term	7,456	7,223
Revolving loans converted to term, charge-offs		0
Total	12,639,650	12,486,027
Total, charge-offs		28,039
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	794,689	1,223,491
Current fiscal year, charge-offs	1,100	13,973
Fiscal year before current fiscal year	862,245	498,757
Fiscal year before current fiscal year, charge-offs	31,803	2,711
Two years before current fiscal year	318,654	272,427
Two years before current fiscal year, charge-offs	205	576
Three years before current fiscal year	209,036	93,854
Three years before current fiscal year, charge-offs	8,425	5,665
Four years before current fiscal year	75,088	52,403
Four years before current fiscal year, charge-offs	345	78
Prior	77,989	46,773
Prior, charge-offs	133	261
Revolving loans amortized cost basis	1,612,112	1,483,039
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	4	204
Revolving loans converted to term, charge-offs	0	0
Total	3,949,817	3,670,948
Total, charge-offs	42,011	23,264
Commercial and industrial loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	778,502	1,175,967
Fiscal year before current fiscal year	810,290	474,601
Two years before current fiscal year	275,900	253,148
Three years before current fiscal year	201,870	86,226
Four years before current fiscal year	70,975	47,910
Prior	76,151	45,020
Revolving loans amortized cost basis	1,533,518	1,393,756
Revolving loans converted to term	4	60
Total	3,747,210	3,476,688
Commercial and industrial loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	2,913	34,356
Fiscal year before current fiscal year	5,746	3,911
Two years before current fiscal year	21,042	1,546
Three years before current fiscal year	1,574	5,149
Four years before current fiscal year	2,488	2,986
Prior	11	241
Revolving loans amortized cost basis	35,722	45,994
Revolving loans converted to term	0	0
Total	69,496	94,183
Commercial and industrial loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	13,274	12,311
Fiscal year before current fiscal year	38,566	20,245
Two years before current fiscal year	21,712	17,733
Three years before current fiscal year	5,592	2,479
Four years before current fiscal year	1,625	1,507
Prior	1,827	1,512
Revolving loans amortized cost basis	42,791	40,449
Revolving loans converted to term	0	144
Total	125,387	96,380
Commercial and industrial loans | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	857
Fiscal year before current fiscal year	7,643	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving loans amortized cost basis	81	2,840
Revolving loans converted to term	0	0
Total	7,724	3,697
Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	22,738	35,691
Fiscal year before current fiscal year	24,922	38,561
Two years before current fiscal year	36,022	31,511
Three years before current fiscal year	29,786	31,502
Four years before current fiscal year	29,361	12,995
Prior	34,615	25,620
Revolving loans amortized cost basis	62,482	87,534
Revolving loans converted to term	0	0
Total	239,926	263,414
Agricultural land, production and other loans to farmers | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	22,137	35,633
Fiscal year before current fiscal year	24,869	38,145
Two years before current fiscal year	34,809	31,511
Three years before current fiscal year	29,077	31,048
Four years before current fiscal year	28,845	12,995
Prior	34,134	25,462
Revolving loans amortized cost basis	61,444	87,534
Revolving loans converted to term	0	0
Total	235,315	262,328
Agricultural land, production and other loans to farmers | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	266
Two years before current fiscal year	245	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	448	122
Revolving loans amortized cost basis	250	0
Revolving loans converted to term	0	0
Total	943	388
Agricultural land, production and other loans to farmers | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	601	58
Fiscal year before current fiscal year	53	150
Two years before current fiscal year	968	0
Three years before current fiscal year	709	454
Four years before current fiscal year	516	0
Prior	33	36
Revolving loans amortized cost basis	788	0
Revolving loans converted to term	0	0
Total	3,668	698
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	187,351	430,923
Fiscal year before current fiscal year	284,487	271,917
Two years before current fiscal year	223,367	203,672
Three years before current fiscal year	101,160	29,218
Four years before current fiscal year	6,632	7,723
Prior	9,460	2,357
Revolving loans amortized cost basis	10,810	11,735
Revolving loans converted to term	0	0
Total	823,267	957,545
Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	166,149	403,578
Fiscal year before current fiscal year	276,029	267,587
Two years before current fiscal year	194,572	198,350
Three years before current fiscal year	95,193	8,372
Four years before current fiscal year	6,632	7,723
Prior	9,460	2,357
Revolving loans amortized cost basis	10,810	11,735
Revolving loans converted to term	0	0
Total	758,845	899,702
Construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	25,894
Fiscal year before current fiscal year	5,600	0
Two years before current fiscal year	23,660	0
Three years before current fiscal year	645	20,846
Four years before current fiscal year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	29,905	46,740
Construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	21,202	1,451
Fiscal year before current fiscal year	2,858	4,330
Two years before current fiscal year	5,135	5,322
Three years before current fiscal year	5,322	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	34,517	11,103
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	342,687	470,118
Current fiscal year, charge-offs	0	0
Fiscal year before current fiscal year	340,949	535,962
Fiscal year before current fiscal year, charge-offs	339	66
Two years before current fiscal year	421,902	542,551
Two years before current fiscal year, charge-offs	3	0
Three years before current fiscal year	463,046	443,320
Three years before current fiscal year, charge-offs	0	0
Four years before current fiscal year	395,483	160,799
Four years before current fiscal year, charge-offs	0	0
Prior	345,721	231,061
Prior, charge-offs	0	0
Revolving loans amortized cost basis	13,745	17,028
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	2,323,533	2,400,839
Total, charge-offs	342	66
Commercial real estate, non-owner occupied | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	245,845	373,378
Fiscal year before current fiscal year	303,828	504,280
Two years before current fiscal year	399,269	535,327
Three years before current fiscal year	451,607	418,553
Four years before current fiscal year	373,231	141,320
Prior	298,925	200,821
Revolving loans amortized cost basis	13,660	16,744
Revolving loans converted to term	0	0
Total	2,086,365	2,190,423
Commercial real estate, non-owner occupied | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	77,354	76,382
Fiscal year before current fiscal year	22,906	21,145
Two years before current fiscal year	21,755	7,005
Three years before current fiscal year	10,937	4,531
Four years before current fiscal year	2,428	19,479
Prior	45,158	27,941
Revolving loans amortized cost basis	0	37
Revolving loans converted to term	0	0
Total	180,538	156,520
Commercial real estate, non-owner occupied | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	19,488	20,358
Fiscal year before current fiscal year	2,927	10,537
Two years before current fiscal year	189	219
Three years before current fiscal year	502	20,236
Four years before current fiscal year	19,824	0
Prior	1,638	2,299
Revolving loans amortized cost basis	85	247
Revolving loans converted to term	0	0
Total	44,653	53,896
Commercial real estate, non-owner occupied | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0
Fiscal year before current fiscal year	11,288
Two years before current fiscal year	689
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	11,977
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	77,807	201,554
Current fiscal year, charge-offs	0	48
Fiscal year before current fiscal year	210,520	208,567
Fiscal year before current fiscal year, charge-offs	0	0
Two years before current fiscal year	191,777	269,848
Two years before current fiscal year, charge-offs	0	0
Three years before current fiscal year	257,150	270,527
Three years before current fiscal year, charge-offs	0	0
Four years before current fiscal year	241,170	100,388
Four years before current fiscal year, charge-offs	9	2
Prior	165,027	83,316
Prior, charge-offs	0	0
Revolving loans amortized cost basis	30,744	27,883
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	1,174,195	1,162,083
Total, charge-offs	9	50
Commercial real estate, owner occupied | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	75,597	176,750
Fiscal year before current fiscal year	191,056	199,821
Two years before current fiscal year	175,737	256,346
Three years before current fiscal year	245,405	263,522
Four years before current fiscal year	231,751	99,180
Prior	159,142	77,485
Revolving loans amortized cost basis	30,206	27,369
Revolving loans converted to term	0	0
Total	1,108,894	1,100,473
Commercial real estate, owner occupied | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	138	6,712
Fiscal year before current fiscal year	3,230	5,034
Two years before current fiscal year	15,076	9,319
Three years before current fiscal year	6,717	2,460
Four years before current fiscal year	5,301	919
Prior	1,750	2,902
Revolving loans amortized cost basis	260	514
Revolving loans converted to term	0	0
Total	32,472	27,860
Commercial real estate, owner occupied | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	2,072	18,092
Fiscal year before current fiscal year	16,234	3,712
Two years before current fiscal year	964	4,183
Three years before current fiscal year	5,028	4,545
Four years before current fiscal year	4,118	289
Prior	4,135	2,929
Revolving loans amortized cost basis	278	0
Revolving loans converted to term	0	0
Total	32,829	33,750
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	112,712	398,334
Current fiscal year, charge-offs	0	101
Fiscal year before current fiscal year	430,932	704,355
Fiscal year before current fiscal year, charge-offs	39	252
Two years before current fiscal year	707,976	448,226
Two years before current fiscal year, charge-offs	403	208
Three years before current fiscal year	428,329	368,420
Three years before current fiscal year, charge-offs	57	3
Four years before current fiscal year	353,034	100,585
Four years before current fiscal year, charge-offs	21	3
Prior	332,506	263,618
Prior, charge-offs	54	94
Revolving loans amortized cost basis	5,402	5,219
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	14	164
Revolving loans converted to term, charge-offs	0	0
Total	2,370,905	2,288,921
Total, charge-offs	574	661
Residential | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	111,630	395,363
Fiscal year before current fiscal year	427,692	695,056
Two years before current fiscal year	698,308	442,495
Three years before current fiscal year	421,439	365,297
Four years before current fiscal year	350,587	98,654
Prior	322,922	254,718
Revolving loans amortized cost basis	5,052	4,988
Revolving loans converted to term	14	83
Total	2,337,644	2,256,654
Residential | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	668	2,167
Fiscal year before current fiscal year	2,480	5,591
Two years before current fiscal year	5,301	3,202
Three years before current fiscal year	3,917	1,924
Four years before current fiscal year	1,197	1,065
Prior	5,147	4,837
Revolving loans amortized cost basis	350	200
Revolving loans converted to term	0	81
Total	19,060	19,067
Residential | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	414	804
Fiscal year before current fiscal year	760	3,708
Two years before current fiscal year	4,367	2,529
Three years before current fiscal year	2,973	1,199
Four years before current fiscal year	1,250	866
Prior	4,437	4,063
Revolving loans amortized cost basis	0	31
Revolving loans converted to term	0	0
Total	14,201	13,200
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	6,781	9,438
Current fiscal year, charge-offs	0	69
Fiscal year before current fiscal year	7,648	30,499
Fiscal year before current fiscal year, charge-offs	11	213
Two years before current fiscal year	27,728	62,318
Two years before current fiscal year, charge-offs	36	224
Three years before current fiscal year	57,069	12,176
Three years before current fiscal year, charge-offs	22	149
Four years before current fiscal year	12,013	1,107
Four years before current fiscal year, charge-offs	0	193
Prior	5,043	4,000
Prior, charge-offs	265	1,596
Revolving loans amortized cost basis	508,043	491,950
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	6,779	6,083
Revolving loans converted to term, charge-offs	0	0
Total	631,104	617,571
Total, charge-offs	334	2,444
Home equity | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	6,606	9,375
Fiscal year before current fiscal year	7,648	29,784
Two years before current fiscal year	26,336	61,591
Three years before current fiscal year	56,066	11,084
Four years before current fiscal year	10,956	1,092
Prior	4,652	3,875
Revolving loans amortized cost basis	500,801	484,330
Revolving loans converted to term	6,294	5,837
Total	619,359	606,968
Home equity | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	113	0
Fiscal year before current fiscal year	0	715
Two years before current fiscal year	1,340	0
Three years before current fiscal year	406	1,092
Four years before current fiscal year	1,057	15
Prior	66	2
Revolving loans amortized cost basis	5,117	5,031
Revolving loans converted to term	245	149
Total	8,344	7,004
Home equity | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	62	63
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	52	727
Three years before current fiscal year	597	0
Four years before current fiscal year	0	0
Prior	325	123
Revolving loans amortized cost basis	2,125	2,589
Revolving loans converted to term	240	97
Total	3,401	3,599
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	34,950	35,965
Current fiscal year, charge-offs	22	147
Fiscal year before current fiscal year	28,114	49,547
Fiscal year before current fiscal year, charge-offs	353	770
Two years before current fiscal year	37,429	28,525
Two years before current fiscal year, charge-offs	232	342
Three years before current fiscal year	14,811	6,795
Three years before current fiscal year, charge-offs	120	77
Four years before current fiscal year	4,093	2,071
Four years before current fiscal year, charge-offs	25	62
Prior	5,896	5,918
Prior, charge-offs	32	156
Revolving loans amortized cost basis	36,137	38,795
Revolving loans amortized cost basis, charge-offs	0	0
Revolving loans converted to term	659	772
Revolving loans converted to term, charge-offs	0	0
Total	162,089	168,388
Total, charge-offs	784	1,554
Individuals' loans for household and other personal expenditures | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	34,921	35,781
Fiscal year before current fiscal year	27,868	49,295
Two years before current fiscal year	37,193	28,387
Three years before current fiscal year	14,676	6,726
Four years before current fiscal year	3,983	2,070
Prior	5,878	5,904
Revolving loans amortized cost basis	35,512	38,619
Revolving loans converted to term	659	772
Total	160,690	167,554
Individuals' loans for household and other personal expenditures | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	29	184
Fiscal year before current fiscal year	224	246
Two years before current fiscal year	226	138
Three years before current fiscal year	135	69
Four years before current fiscal year	110	0
Prior	18	14
Revolving loans amortized cost basis	623	176
Revolving loans converted to term	0	0
Total	1,365	827
Individuals' loans for household and other personal expenditures | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	22	6
Two years before current fiscal year	10	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	1
Prior	0	0
Revolving loans amortized cost basis	2	0
Revolving loans converted to term	0	0
Total	34	7
Public finance and other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	43,164	65,357
Current fiscal year, charge-offs	1,122
Fiscal year before current fiscal year	54,409	208,347
Fiscal year before current fiscal year, charge-offs	32,545
Two years before current fiscal year	206,136	204,863
Two years before current fiscal year, charge-offs	879
Three years before current fiscal year	199,844	155,132
Three years before current fiscal year, charge-offs	8,624
Four years before current fiscal year	152,505	91,619
Four years before current fiscal year, charge-offs	400
Prior	308,167	229,355
Prior, charge-offs	484
Revolving loans amortized cost basis	589	1,645
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term	0	0
Revolving loans converted to term, charge-offs	0
Total	964,814	956,318
Total, charge-offs	44,054
Public finance and other commercial loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	43,164	65,357
Fiscal year before current fiscal year	54,409	208,347
Two years before current fiscal year	206,136	204,863
Three years before current fiscal year	199,844	155,132
Four years before current fiscal year	152,505	91,619
Prior	308,167	229,355
Revolving loans amortized cost basis	589	1,645
Revolving loans converted to term	0	0
Total	$ 964,814	$ 956,318