ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Risk category of loans by loan segment and origination (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	$ 680,463	$ 839,292
Year Two	692,971	719,840
Year Three	587,343	414,127
Year Four	321,196	207,202
Year Five	148,135	217,546
Prior	323,289	266,255
Term Total	2,753,397	2,664,262
Revolving	1,736,438	1,623,579
Total	4,489,835	4,287,841
Other commercial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	19,286	6,556
Year Two	5,854	21,111
Year Three	19,079	3,243
Year Four	156	1,273
Year Five	995	8,592
Prior	16,158	11,258
Term Total	61,528	52,033
Revolving	39,046	21,145
Total	100,574	73,178
Working capital lines of credit loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	3,699
Year Two	2,841	830
Year Three	1,795	3,395
Year Four	0	0
Year Five	0	0
Prior	0	0
Term Total	4,636	7,924
Revolving	679,707	645,003
Total	684,343	652,927
Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	244,756	208,363
Year Two	143,334	147,863
Year Three	105,698	81,630
Year Four	53,378	42,975
Year Five	16,624	27,358
Prior	26,746	20,355
Term Total	590,536	528,544
Revolving	236,189	207,115
Total	826,725	735,659
Construction and land development loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One		35,136
Year Two		30,224
Year Three		1,276
Year Four		998
Year Five		0
Prior		0
Term Total		67,634
Revolving		310,396
Total		378,030
Owner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	75,374	142,905
Year Two	185,722	170,974
Year Three	150,707	125,906
Year Four	101,122	87,761
Year Five	73,537	86,236
Prior	109,854	95,398
Term Total	696,316	709,180
Revolving	44,382	29,611
Total	740,698	738,791
Nonowner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	126,326	158,167
Year Two	140,139	154,764
Year Three	140,706	107,262
Year Four	93,016	19,054
Year Five	13,844	31,023
Prior	75,388	73,407
Term Total	589,419	543,677
Revolving	66,248	44,362
Total	655,667	588,039
Multifamily loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	41,725	84,678
Year Two	25,847	53,195
Year Three	37,245	36,575
Year Four	35,896	12,286
Year Five	11,752	36,826
Prior	28,977	9,793
Term Total	181,442	233,353
Revolving	9,492	13,434
Total	190,934	246,787
Loans secured by farmland | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	28,844	47,739
Year Two	42,904	39,020
Year Three	32,275	18,552
Year Four	11,767	10,469
Year Five	8,581	10,634
Prior	20,768	17,196
Term Total	145,139	143,610
Revolving	20,171	62,692
Total	165,310	206,302
Loans for agricultural production | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	3,199	36,686
Year Two	31,699	34,497
Year Three	30,292	5,395
Year Four	4,841	11,072
Year Five	9,521	1,331
Prior	4,792	4,178
Term Total	84,344	93,159
Revolving	92,483	146,414
Total	176,827	239,573
Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	45,877	59,724
Year Two	57,744	43,911
Year Three	33,335	14,560
Year Four	11,068	11,120
Year Five	7,809	10,677
Prior	34,351	30,816
Term Total	190,184	170,808
Revolving	5,618	5,487
Total	195,802	176,295
Open end and junior lien loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	39,296	22,624
Year Two	15,774	6,003
Year Three	3,807	6,146
Year Four	4,091	4,212
Year Five	1,995	1,653
Prior	2,456	1,526
Term Total	67,419	42,164
Revolving	107,770	115,695
Total	175,189	157,859
Residential construction loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	12,215	7,926
Year Two	3,901	1,537
Year Three	910	960
Year Four	300	138
Year Five	132	171
Prior	1,241	1,125
Term Total	18,699	11,857
Revolving	0	0
Total	18,699	11,857
Other consumer loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	19,770	25,089
Year Two	17,965	15,911
Year Three	10,661	9,227
Year Four	5,139	5,844
Year Five	3,345	3,045
Prior	2,558	1,203
Term Total	59,438	60,319
Revolving	33,381	22,225
Total	92,819	82,544
Pass | Other commercial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	19,286	6,556
Year Two	5,854	21,111
Year Three	19,079	3,243
Year Four	156	1,273
Year Five	995	8,592
Prior	12,817	7,460
Term Total	58,187	48,235
Revolving	39,046	21,145
Total	97,233	69,380
Pass | PPP
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,600	26,200
Pass | Working capital lines of credit loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	3,699
Year Two	2,841	830
Year Three	1,795	3,360
Year Four	0	0
Year Five	0	0
Prior	0	0
Term Total	4,636	7,889
Revolving	622,729	558,634
Total	627,365	566,523
Pass | Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	240,076	185,374
Year Two	134,468	139,157
Year Three	98,133	79,477
Year Four	52,784	38,899
Year Five	14,249	19,415
Prior	18,906	18,489
Term Total	558,616	480,811
Revolving	232,421	203,794
Total	791,037	684,605
Pass | Construction and land development loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	23,795	35,136
Year Two	19,247	30,224
Year Three	20,833	1,276
Year Four	422	998
Year Five	0	0
Prior	0	0
Term Total	64,297	67,634
Revolving	401,951	310,396
Total	466,248	378,030
Pass | Owner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	73,876	135,861
Year Two	180,121	169,404
Year Three	149,215	124,117
Year Four	100,287	85,070
Year Five	70,756	78,155
Prior	101,475	93,925
Term Total	675,730	686,532
Revolving	44,382	29,611
Total	720,112	716,143
Pass | Nonowner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	126,326	146,342
Year Two	128,907	154,433
Year Three	140,706	107,262
Year Four	93,016	19,054
Year Five	13,844	31,023
Prior	75,388	59,154
Term Total	578,187	517,268
Revolving	66,248	44,362
Total	644,435	561,630
Pass | Multifamily loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	19,757	84,678
Year Two	25,847	53,195
Year Three	37,245	36,575
Year Four	35,896	12,286
Year Five	11,752	14,574
Prior	28,977	9,793
Term Total	159,474	211,101
Revolving	9,492	13,434
Total	168,966	224,535
Pass | Loans secured by farmland | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	28,584	47,532
Year Two	42,904	37,035
Year Three	30,599	16,249
Year Four	9,904	10,469
Year Five	8,581	10,454
Prior	20,594	17,021
Term Total	141,166	138,760
Revolving	20,171	61,774
Total	161,337	200,534
Pass | Loans for agricultural production | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2,899	36,238
Year Two	31,300	25,855
Year Three	23,029	4,224
Year Four	3,845	11,072
Year Five	9,521	1,331
Prior	4,792	4,178
Term Total	75,386	82,898
Revolving	89,018	138,142
Total	164,404	221,040
Pass | Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	6,500	14,635
Year Two	13,063	16,173
Year Three	12,601	5,312
Year Four	4,881	5,903
Year Five	4,727	3,049
Prior	4,054	3,221
Term Total	45,826	48,293
Revolving	5,618	5,005
Total	51,444	53,298
Pass | Open end and junior lien loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	679
Year Two	631	379
Year Three	362	159
Year Four	77	313
Year Five	77	0
Prior	0	0
Term Total	1,147	1,530
Revolving	5,129	5,074
Total	6,276	6,604
Pass | Other consumer loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,484	3,401
Year Two	1,919	957
Year Three	488	1,523
Year Four	600	0
Year Five	0	1,155
Prior	992	0
Term Total	5,483	7,036
Revolving	22,394	12,998
Total	27,877	20,034
Special Mention | Other commercial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	3,341	3,798
Term Total	3,341	3,798
Revolving	0	0
Total	3,341	3,798
Special Mention | Working capital lines of credit loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Term Total	0	0
Revolving	41,856	60,441
Total	41,856	60,441
Special Mention | Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	479	17,728
Year Two	4,741	0
Year Three	0	225
Year Four	111	979
Year Five	197	2,350
Prior	3,388	1,426
Term Total	8,916	22,708
Revolving	207	0
Total	9,123	22,708
Special Mention | Owner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,176	6,555
Year Two	5,495	0
Year Three	0	880
Year Four	835	933
Year Five	1,620	7,387
Prior	8,148	1,235
Term Total	17,274	16,990
Revolving	0	0
Total	17,274	16,990
Special Mention | Nonowner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	11,825
Year Two	11,232	331
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	14,253
Term Total	11,232	26,409
Revolving	0	0
Total	11,232	26,409
Special Mention | Multifamily loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	21,968	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	22,252
Prior	0	0
Term Total	21,968	22,252
Revolving	0	0
Total	21,968	22,252
Special Mention | Loans secured by farmland | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	260	0
Year Two	0	1,985
Year Three	1,676	2,303
Year Four	1,863	0
Year Five	0	180
Prior	29	30
Term Total	3,828	4,498
Revolving	0	918
Total	3,828	5,416
Special Mention | Loans for agricultural production | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	300	448
Year Two	399	8,642
Year Three	7,263	1,171
Year Four	996	0
Year Five	0	0
Prior	0	0
Term Total	8,958	10,261
Revolving	3,465	8,272
Total	12,423	18,533
Special Mention | Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	560	0
Year Four	0	0
Year Five	0	0
Prior	0	1,274
Term Total	560	1,274
Revolving	0	0
Total	560	1,274
Substandard | Working capital lines of credit loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	35
Year Four	0	0
Year Five	0	0
Prior	0	0
Term Total	0	35
Revolving	15,122	25,928
Total	15,122	25,963
Substandard | Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,972	2,996
Year Two	2,450	6,948
Year Three	6,210	1,091
Year Four	3	2,534
Year Five	1,971	5,465
Prior	4,423	426
Term Total	17,029	19,460
Revolving	3,561	3,321
Total	20,590	22,781
Substandard | Owner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	322	489
Year Two	106	1,570
Year Three	1,492	909
Year Four	0	1,758
Year Five	1,161	694
Prior	231	238
Term Total	3,312	5,658
Revolving	0	0
Total	3,312	5,658
Substandard | Loans secured by farmland | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	207
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	145	145
Term Total	145	352
Revolving	0	0
Total	145	352
Substandard | Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0
Year Two	0
Year Three	0
Year Four	0
Year Five	0
Prior	1,749
Term Total	1,749
Revolving	0
Total	1,749
Substandard | Open end and junior lien loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One		0
Year Two		0
Year Three		0
Year Four		0
Year Five		0
Prior		0
Term Total		0
Revolving		98
Total		98
Substandard | Other consumer loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	36
Year Two	0	23
Year Three	0	230
Year Four	203	0
Year Five	0	0
Prior	0	0
Term Total	203	289
Revolving	0	0
Total	203	289
Not Rated | Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2,229	2,265
Year Two	1,675	1,758
Year Three	1,355	837
Year Four	480	563
Year Five	207	128
Prior	29	14
Term Total	5,975	5,565
Revolving	0	0
Total	5,975	5,565
Not Rated | Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	39,377	45,089
Year Two	44,681	27,738
Year Three	20,174	9,248
Year Four	6,187	5,217
Year Five	3,082	7,628
Prior	28,548	26,321
Term Total	142,049	121,241
Revolving	0	482
Total	142,049	121,723
Not Rated | Open end and junior lien loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	39,296	21,945
Year Two	15,143	5,624
Year Three	3,445	5,987
Year Four	4,014	3,899
Year Five	1,918	1,653
Prior	2,456	1,526
Term Total	66,272	40,634
Revolving	102,641	110,523
Total	168,913	151,157
Not Rated | Residential construction loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	12,215	7,926
Year Two	3,901	1,537
Year Three	910	960
Year Four	300	138
Year Five	132	171
Prior	1,241	1,125
Term Total	18,699	11,857
Revolving	0	0
Total	18,699	11,857
Not Rated | Other consumer loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	18,286	21,652
Year Two	16,046	14,931
Year Three	10,173	7,474
Year Four	4,336	5,844
Year Five	3,345	1,890
Prior	1,566	1,203
Term Total	53,752	52,994
Revolving	10,987	9,227
Total	$ 64,739	$ 62,221