ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Risk category of loans by loan segment and origination (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 201,397	$ 839,292
2021	816,358	719,840
2020	664,014	414,127
2019	378,947	207,202
2018	181,461	217,546
Prior	395,936	266,255
Term Total	2,638,113	2,664,262
Revolving	1,715,601	1,623,579
Total	4,353,714	4,287,841
Other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022	2,964	6,556
2021	6,417	21,111
2020	20,425	3,243
2019	3,082	1,273
2018	1,175	8,592
Prior	18,692	11,258
Term Total	52,755	52,033
Revolving	25,363	21,145
Total	78,118	73,178
Working capital lines of credit loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	3,699
2021	3,082	830
2020	838	3,395
2019	3,045	0
2018	0	0
Prior	0	0
Term Total	6,965	7,924
Revolving	671,689	645,003
Total	678,654	652,927
Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	64,438	208,363
2021	186,973	147,863
2020	131,807	81,630
2019	73,495	42,975
2018	27,145	27,358
Prior	40,201	20,355
Term Total	524,059	528,544
Revolving	260,376	207,115
Total	784,435	735,659
Construction and land development loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	9,322	35,136
2021	37,819	30,224
2020	20,870	1,276
2019	542	998
2018	573	0
Prior	0	0
Term Total	69,126	67,634
Revolving	328,649	310,396
Total	397,775	378,030
Owner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	20,705	142,905
2021	173,527	170,974
2020	175,680	125,906
2019	109,940	87,761
2018	80,330	86,236
Prior	135,558	95,398
Term Total	695,740	709,180
Revolving	28,228	29,611
Total	723,968	738,791
Nonowner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	41,921	158,167
2021	153,737	154,764
2020	146,895	107,262
2019	105,635	19,054
2018	21,701	31,023
Prior	101,200	73,407
Term Total	571,089	543,677
Revolving	47,604	44,362
Total	618,693	588,039
Multifamily loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	24,843	84,678
2021	67,930	53,195
2020	37,909	36,575
2019	36,337	12,286
2018	11,969	36,826
Prior	21,061	9,793
Term Total	200,049	233,353
Revolving	13,605	13,434
Total	213,654	246,787
Loans secured by farmland | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	4,748	47,739
2021	46,921	39,020
2020	37,074	18,552
2019	14,283	10,469
2018	10,224	10,634
Prior	25,544	17,196
Term Total	138,794	143,610
Revolving	25,431	62,692
Total	164,225	206,302
Loans for agricultural production | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,573	36,686
2021	31,876	34,497
2020	32,547	5,395
2019	5,145	11,072
2018	10,372	1,331
Prior	5,356	4,178
Term Total	86,869	93,159
Revolving	172,626	146,414
Total	259,495	239,573
Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	9,439	59,724
2021	60,854	43,911
2020	39,724	14,560
2019	13,961	11,120
2018	9,879	10,677
Prior	40,143	30,816
Term Total	174,000	170,808
Revolving	6,191	5,487
Total	180,191	176,295
Open end and junior lien loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	14,626	22,624
2021	19,299	6,003
2020	5,041	6,146
2019	5,082	4,212
2018	3,079	1,653
Prior	3,306	1,526
Term Total	50,433	42,164
Revolving	109,805	115,695
Total	160,238	157,859
Residential construction loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,420	7,926
2021	6,189	1,537
2020	1,158	960
2019	892	138
2018	136	171
Prior	1,278	1,125
Term Total	11,073	11,857
Revolving	0	0
Total	11,073	11,857
Other consumer loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	5,398	25,089
2021	21,734	15,911
2020	14,046	9,227
2019	7,508	5,844
2018	4,878	3,045
Prior	3,597	1,203
Term Total	57,161	60,319
Revolving	26,034	22,225
Total	83,195	82,544
Pass | Other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022	2,964	6,556
2021	6,417	21,111
2020	20,425	3,243
2019	3,082	1,273
2018	1,175	8,592
Prior	15,043	7,460
Term Total	49,106	48,235
Revolving	25,363	21,145
Total	74,469	69,380
Pass | Working capital lines of credit loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	3,699
2021	3,082	830
2020	764	3,360
2019	3,045	0
2018	0	0
Prior	0	0
Term Total	6,891	7,889
Revolving	593,938	558,634
Total	600,829	566,523
Pass | Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	63,830	185,374
2021	165,396	139,157
2020	123,800	79,477
2019	71,707	38,899
2018	23,723	19,415
Prior	31,231	18,489
Term Total	479,687	480,811
Revolving	256,462	203,794
Total	736,149	684,605
Pass | Construction and land development loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	9,322	35,136
2021	37,819	30,224
2020	20,870	1,276
2019	542	998
2018	573	0
Prior	0	0
Term Total	69,126	67,634
Revolving	328,593	310,396
Total	397,719	378,030
Pass | Owner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	20,705	135,861
2021	166,777	169,404
2020	174,001	124,117
2019	108,181	85,070
2018	78,260	78,155
Prior	126,142	93,925
Term Total	674,066	686,532
Revolving	28,228	29,611
Total	702,294	716,143
Pass | Nonowner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	41,921	146,342
2021	142,070	154,433
2020	146,588	107,262
2019	105,635	19,054
2018	21,701	31,023
Prior	87,080	59,154
Term Total	544,995	517,268
Revolving	47,604	44,362
Total	592,599	561,630
Pass | Multifamily loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	2,665	84,678
2021	67,930	53,195
2020	37,909	36,575
2019	36,337	12,286
2018	11,969	14,574
Prior	21,061	9,793
Term Total	177,871	211,101
Revolving	13,605	13,434
Total	191,476	224,535
Pass | Loans secured by farmland | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	4,748	47,532
2021	46,921	37,035
2020	35,089	16,249
2019	12,005	10,469
2018	10,034	10,454
Prior	25,189	17,021
Term Total	133,986	138,760
Revolving	24,532	61,774
Total	158,518	200,534
Pass | Loans for agricultural production | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,573	36,238
2021	31,444	25,855
2020	24,820	4,224
2019	3,985	11,072
2018	10,372	1,331
Prior	5,356	4,178
Term Total	77,550	82,898
Revolving	166,721	138,142
Total	244,271	221,040
Pass | Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,360	14,635
2021	13,558	16,173
2020	15,386	5,312
2019	5,197	5,903
2018	5,722	3,049
Prior	4,604	3,221
Term Total	45,827	48,293
Revolving	6,191	5,005
Total	52,018	53,298
Pass | Open end and junior lien loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	679
2021	662	379
2020	374	159
2019	115	313
2018	103	0
Prior	0	0
Term Total	1,254	1,530
Revolving	4,900	5,074
Total	6,154	6,604
Pass | Other consumer loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	78	3,401
2021	2,302	957
2020	787	1,523
2019	1,167	0
2018	0	1,155
Prior	1,088	0
Term Total	5,422	7,036
Revolving	17,046	12,998
Total	22,468	20,034
Special Mention | Other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	3,649	3,798
Term Total	3,649	3,798
Revolving	0	0
Total	3,649	3,798
Special Mention | Working capital lines of credit loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Term Total	0	0
Revolving	59,209	60,441
Total	59,209	60,441
Special Mention | Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	209	17,728
2021	16,535	0
2020	0	225
2019	216	979
2018	635	2,350
Prior	3,657	1,426
Term Total	21,252	22,708
Revolving	79	0
Total	21,331	22,708
Special Mention | Construction and land development loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	0
2020	0
2019	0
2018	0
Prior	0
Term Total	0
Revolving	56
Total	56
Special Mention | Owner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	6,555
2021	6,277	0
2020	0	880
2019	865	933
2018	909	7,387
Prior	9,180	1,235
Term Total	17,231	16,990
Revolving	0	0
Total	17,231	16,990
Special Mention | Nonowner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	11,825
2021	11,667	331
2020	307	0
2019	0	0
2018	0	0
Prior	14,120	14,253
Term Total	26,094	26,409
Revolving	0	0
Total	26,094	26,409
Special Mention | Multifamily loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	22,178	0
2021	0	0
2020	0	0
2019	0	0
2018	0	22,252
Prior	0	0
Term Total	22,178	22,252
Revolving	0	0
Total	22,178	22,252
Special Mention | Loans secured by farmland | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	1,985
2020	1,985	2,303
2019	2,278	0
2018	0	180
Prior	210	30
Term Total	4,473	4,498
Revolving	899	918
Total	5,372	5,416
Special Mention | Loans for agricultural production | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	448
2021	432	8,642
2020	7,727	1,171
2019	1,160	0
2018	0	0
Prior	0	0
Term Total	9,319	10,261
Revolving	5,905	8,272
Total	15,224	18,533
Special Mention | Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		1,274
Term Total		1,274
Revolving		0
Total		1,274
Substandard | Working capital lines of credit loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	74	35
2019	0	0
2018	0	0
Prior	0	0
Term Total	74	35
Revolving	18,542	25,928
Total	18,616	25,963
Substandard | Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	2,996
2021	2,937	6,948
2020	6,380	1,091
2019	862	2,534
2018	2,370	5,465
Prior	5,217	426
Term Total	17,766	19,460
Revolving	3,835	3,321
Total	21,601	22,781
Substandard | Owner occupied loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	489
2021	473	1,570
2020	1,679	909
2019	894	1,758
2018	1,161	694
Prior	236	238
Term Total	4,443	5,658
Revolving	0	0
Total	4,443	5,658
Substandard | Loans secured by farmland | Agri-business and agricultural loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	207
2021	0	0
2020	0	0
2019	0	0
2018	190	0
Prior	145	145
Term Total	335	352
Revolving	0	0
Total	335	352
Substandard | Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	0
2020	0
2019	0
2018	88
Prior	3,050
Term Total	3,138
Revolving	0
Total	3,138
Substandard | Open end and junior lien loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	2	0
Term Total	2	0
Revolving	26	98
Total	28	98
Substandard | Other consumer loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	36
2021	0	23
2020	22	230
2019	219	0
2018	0	0
Prior	0	0
Term Total	241	289
Revolving	41	0
Total	282	289
Not Rated | Non-working capital loans | Commercial and industrial loans:
Financing Receivable, Credit Quality Indicator [Line Items]
2022	399	2,265
2021	2,105	1,758
2020	1,627	837
2019	710	563
2018	417	128
Prior	96	14
Term Total	5,354	5,565
Revolving	0	0
Total	5,354	5,565
Not Rated | Closed end first mortgage loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	8,079	45,089
2021	47,296	27,738
2020	24,338	9,248
2019	8,764	5,217
2018	4,069	7,628
Prior	32,489	26,321
Term Total	125,035	121,241
Revolving	0	482
Total	125,035	121,723
Not Rated | Open end and junior lien loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	14,626	21,945
2021	18,637	5,624
2020	4,667	5,987
2019	4,967	3,899
2018	2,976	1,653
Prior	3,304	1,526
Term Total	49,177	40,634
Revolving	104,879	110,523
Total	154,056	151,157
Not Rated | Residential construction loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,420	7,926
2021	6,189	1,537
2020	1,158	960
2019	892	138
2018	136	171
Prior	1,278	1,125
Term Total	11,073	11,857
Revolving	0	0
Total	11,073	11,857
Not Rated | Other consumer loans | Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2022	5,320	21,652
2021	19,432	14,931
2020	13,237	7,474
2019	6,122	5,844
2018	4,878	1,890
Prior	2,509	1,203
Term Total	51,498	52,994
Revolving	8,947	9,227
Total	$ 60,445	$ 62,221