LOANS AND ALLOWANCE - Risk Grading of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	$ 2,734,634	$ 3,023,847
Fiscal year before current fiscal year	2,805,112	2,456,983
Two years before current fiscal year	2,067,592	778,086
Three years before current fiscal year	715,631	359,554
Four years before current fiscal year	421,042	353,319
Prior	891,729	605,794
Revolving loans amortized cost basis	2,000,194	1,664,006
Revolving loans converted to term	14,068	272
Total	11,650,002	9,241,861
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	890,469	1,033,127
Fiscal year before current fiscal year	658,337	375,587
Two years before current fiscal year	204,547	152,142
Three years before current fiscal year	141,850	68,827
Four years before current fiscal year	73,060	23,936
Prior	51,996	32,992
Revolving loans amortized cost basis	1,304,732	1,027,954
Revolving loans converted to term	5,538	0
Total	3,330,529	2,714,565
Commercial and industrial loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	878,457	1,019,757
Fiscal year before current fiscal year	614,161	362,372
Two years before current fiscal year	186,559	144,520
Three years before current fiscal year	125,026	65,165
Four years before current fiscal year	66,915	21,575
Prior	47,867	30,420
Revolving loans amortized cost basis	1,230,085	990,335
Revolving loans converted to term	5,314	0
Total	3,154,384	2,634,144
Commercial and industrial loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	1,521	10,559
Fiscal year before current fiscal year	15,221	11,088
Two years before current fiscal year	11,756	190
Three years before current fiscal year	5,954	730
Four years before current fiscal year	1,329	1,930
Prior	2,527	1,825
Revolving loans amortized cost basis	26,744	15,026
Revolving loans converted to term	155	0
Total	65,207	41,348
Commercial and industrial loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	10,491	2,811
Fiscal year before current fiscal year	28,753	2,127
Two years before current fiscal year	6,232	7,432
Three years before current fiscal year	10,870	2,932
Four years before current fiscal year	4,446	431
Prior	1,602	747
Revolving loans amortized cost basis	47,844	22,593
Revolving loans converted to term	69	0
Total	110,307	39,073
Commercial and industrial loans | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0
Fiscal year before current fiscal year	202
Two years before current fiscal year	0
Three years before current fiscal year	0
Four years before current fiscal year	370
Prior	0
Revolving loans amortized cost basis	59
Revolving loans converted to term	0
Total	631
Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	34,850	50,775
Fiscal year before current fiscal year	39,191	47,213
Two years before current fiscal year	38,059	22,303
Three years before current fiscal year	17,772	8,060
Four years before current fiscal year	4,967	6,153
Prior	32,548	36,353
Revolving loans amortized cost basis	54,567	75,585
Revolving loans converted to term	0	0
Total	221,954	246,442
Agricultural land, production and other loans to farmers | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	34,381	50,251
Fiscal year before current fiscal year	39,191	45,164
Two years before current fiscal year	37,456	22,195
Three years before current fiscal year	17,772	7,689
Four years before current fiscal year	4,587	6,153
Prior	32,159	36,074
Revolving loans amortized cost basis	54,567	74,871
Revolving loans converted to term	0	0
Total	220,113	242,397
Agricultural land, production and other loans to farmers | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	286	0
Fiscal year before current fiscal year	0	1,543
Two years before current fiscal year	107	0
Three years before current fiscal year	0	0
Four years before current fiscal year	201	0
Prior	362	252
Revolving loans amortized cost basis	0	264
Revolving loans converted to term	0	0
Total	956	2,059
Agricultural land, production and other loans to farmers | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	183	524
Fiscal year before current fiscal year	0	506
Two years before current fiscal year	496	108
Three years before current fiscal year	0	371
Four years before current fiscal year	179	0
Prior	27	27
Revolving loans amortized cost basis	0	450
Revolving loans converted to term	0	0
Total	885	1,986
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	304,868	235,904
Fiscal year before current fiscal year	303,989	201,132
Two years before current fiscal year	176,598	63,589
Three years before current fiscal year	20,314	979
Four years before current fiscal year	878	1,762
Prior	4,165	2,499
Revolving loans amortized cost basis	18,111	17,201
Revolving loans converted to term	0	0
Total	828,923	523,066
Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	294,576	215,167
Fiscal year before current fiscal year	298,393	200,169
Two years before current fiscal year	174,152	63,589
Three years before current fiscal year	20,314	979
Four years before current fiscal year	878	1,762
Prior	4,146	2,453
Revolving loans amortized cost basis	18,111	17,201
Revolving loans converted to term	0	0
Total	810,570	501,320
Construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	10,278	20,737
Fiscal year before current fiscal year	5,596	270
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	46
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	15,874	21,053
Construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	14	0
Fiscal year before current fiscal year	0	693
Two years before current fiscal year	2,446	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	19	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	2,479	693
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	436,486	676,889
Fiscal year before current fiscal year	620,181	852,798
Two years before current fiscal year	660,713	227,510
Three years before current fiscal year	183,224	113,089
Four years before current fiscal year	140,710	109,556
Prior	231,478	128,838
Revolving loans amortized cost basis	18,392	26,779
Revolving loans converted to term	8,088	0
Total	2,299,272	2,135,459
Commercial real estate, non-owner occupied | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	377,307	589,296
Fiscal year before current fiscal year	604,997	688,406
Two years before current fiscal year	597,682	227,332
Three years before current fiscal year	164,320	111,971
Four years before current fiscal year	124,987	103,400
Prior	212,121	126,837
Revolving loans amortized cost basis	18,382	26,779
Revolving loans converted to term	8,088	0
Total	2,107,884	1,874,021
Commercial real estate, non-owner occupied | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	42,890	68,279
Fiscal year before current fiscal year	4,567	149,480
Two years before current fiscal year	54,691	0
Three years before current fiscal year	18,904	0
Four years before current fiscal year	11,577	0
Prior	17,152	1,723
Revolving loans amortized cost basis	10	0
Revolving loans converted to term	0	0
Total	149,791	219,482
Commercial real estate, non-owner occupied | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	16,289	19,314
Fiscal year before current fiscal year	10,617	14,912
Two years before current fiscal year	8,340	178
Three years before current fiscal year	0	1,118
Four years before current fiscal year	4,146	6,156
Prior	2,205	278
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	41,597	41,956
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	217,160	311,876
Fiscal year before current fiscal year	338,466	404,099
Two years before current fiscal year	360,434	93,076
Three years before current fiscal year	130,562	44,837
Four years before current fiscal year	72,798	47,059
Prior	110,928	51,626
Revolving loans amortized cost basis	38,219	34,147
Revolving loans converted to term	0	0
Total	1,268,567	986,720
Commercial real estate, owner occupied | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	211,858	299,186
Fiscal year before current fiscal year	327,263	392,383
Two years before current fiscal year	356,155	92,338
Three years before current fiscal year	125,517	43,252
Four years before current fiscal year	68,189	46,044
Prior	100,242	48,571
Revolving loans amortized cost basis	36,897	33,998
Revolving loans converted to term	0	0
Total	1,226,121	955,772
Commercial real estate, owner occupied | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	2,301	5,665
Fiscal year before current fiscal year	9,957	5,953
Two years before current fiscal year	1,261	738
Three years before current fiscal year	3,418	1,532
Four years before current fiscal year	1,339	902
Prior	3,883	1,301
Revolving loans amortized cost basis	1,322	149
Revolving loans converted to term	0	0
Total	23,481	16,240
Commercial real estate, owner occupied | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	3,001	7,025
Fiscal year before current fiscal year	1,246	5,763
Two years before current fiscal year	3,018	0
Three years before current fiscal year	1,627	53
Four years before current fiscal year	3,270	113
Prior	6,791	1,754
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total	18,953	14,708
Commercial real estate, owner occupied | 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	0
Four years before current fiscal year	0
Prior	12
Revolving loans amortized cost basis	0
Revolving loans converted to term	0
Total	12
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	621,156	351,764
Fiscal year before current fiscal year	501,954	356,660
Two years before current fiscal year	418,980	104,819
Three years before current fiscal year	114,861	71,299
Four years before current fiscal year	82,529	55,520
Prior	245,115	216,032
Revolving loans amortized cost basis	5,890	2,955
Revolving loans converted to term	183	78
Total	1,990,668	1,159,127
Residential | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	617,087	349,726
Fiscal year before current fiscal year	497,367	353,691
Two years before current fiscal year	415,995	103,028
Three years before current fiscal year	112,715	69,745
Four years before current fiscal year	80,783	55,240
Prior	240,572	210,669
Revolving loans amortized cost basis	5,735	2,955
Revolving loans converted to term	128	73
Total	1,970,382	1,145,127
Residential | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	3,333	1,034
Fiscal year before current fiscal year	2,946	1,394
Two years before current fiscal year	828	1,456
Three years before current fiscal year	1,128	306
Four years before current fiscal year	137	172
Prior	3,283	2,106
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	55	0
Total	11,710	6,468
Residential | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	736	1,004
Fiscal year before current fiscal year	1,641	1,575
Two years before current fiscal year	2,157	335
Three years before current fiscal year	1,018	1,248
Four years before current fiscal year	1,609	108
Prior	1,260	3,257
Revolving loans amortized cost basis	155	0
Revolving loans converted to term	0	5
Total	8,576	7,532
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	28,341	64,365
Fiscal year before current fiscal year	77,715	17,641
Two years before current fiscal year	18,398	2,025
Three years before current fiscal year	1,642	2,135
Four years before current fiscal year	1,583	1,341
Prior	4,034	3,526
Revolving loans amortized cost basis	489,647	432,527
Revolving loans converted to term	259	194
Total	621,619	523,754
Home equity | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	28,015	63,845
Fiscal year before current fiscal year	77,360	17,556
Two years before current fiscal year	15,547	1,977
Three years before current fiscal year	1,596	2,127
Four years before current fiscal year	1,479	1,250
Prior	3,958	3,432
Revolving loans amortized cost basis	485,056	427,437
Revolving loans converted to term	259	194
Total	613,270	517,818
Home equity | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	326	0
Fiscal year before current fiscal year	0	85
Two years before current fiscal year	0	48
Three years before current fiscal year	46	0
Four years before current fiscal year	39	0
Prior	13	24
Revolving loans amortized cost basis	3,032	3,451
Revolving loans converted to term	0	0
Total	3,456	3,608
Home equity | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	520
Fiscal year before current fiscal year	355	0
Two years before current fiscal year	2,851	0
Three years before current fiscal year	0	8
Four years before current fiscal year	65	91
Prior	63	70
Revolving loans amortized cost basis	1,559	1,639
Revolving loans converted to term	0	0
Total	4,893	2,328
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	52,981	67,828
Fiscal year before current fiscal year	48,967	23,537
Two years before current fiscal year	15,183	11,943
Three years before current fiscal year	6,629	11,230
Four years before current fiscal year	6,830	2,028
Prior	4,563	4,986
Revolving loans amortized cost basis	38,072	24,540
Revolving loans converted to term	0	0
Total	173,225	146,092
Individuals' loans for household and other personal expenditures | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	52,915	67,749
Fiscal year before current fiscal year	48,873	23,452
Two years before current fiscal year	15,018	11,893
Three years before current fiscal year	6,596	11,197
Four years before current fiscal year	6,723	2,008
Prior	4,542	4,928
Revolving loans amortized cost basis	37,346	24,406
Revolving loans converted to term	0	0
Total	172,013	145,633
Individuals' loans for household and other personal expenditures | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	66	79
Fiscal year before current fiscal year	92	85
Two years before current fiscal year	165	50
Three years before current fiscal year	33	33
Four years before current fiscal year	107	20
Prior	21	58
Revolving loans amortized cost basis	726	134
Revolving loans converted to term	0	0
Total	1,210	459
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	2
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	2
Public finance and other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	148,323	231,319
Fiscal year before current fiscal year	216,312	178,316
Two years before current fiscal year	174,680	100,679
Three years before current fiscal year	98,777	39,098
Four years before current fiscal year	37,687	105,964
Prior	206,902	128,942
Revolving loans amortized cost basis	32,564	22,318
Revolving loans converted to term	0	0
Total	915,245	806,636
Public finance and other commercial loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	148,323	231,319
Fiscal year before current fiscal year	216,312	178,316
Two years before current fiscal year	174,680	100,679
Three years before current fiscal year	98,777	39,098
Four years before current fiscal year	37,687	105,964
Prior	206,902	128,942
Revolving loans amortized cost basis	32,564	22,318
Revolving loans converted to term	0	0
Total	$ 915,245	$ 806,636