ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Risk category of loans by loan segment and origination (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 839,292
2020	719,840
2019	414,127
2018	207,202
2017	217,546
Prior	266,255
Term Total	2,664,262
Revolving	1,623,579
Total	4,287,841
Total ending loans balance		$ 4,649,156
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		3,997,245
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		251,891
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		34,264
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		365,756
Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		1,784,926
Commercial and Industrial | Working capital lines of credit loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3,699
2020	830
2019	3,395
2018	0
2017	0
Prior	0
Term Total	7,924
Revolving	645,003
Total	652,927
Total ending loans balance		626,099
Commercial and Industrial | Working capital lines of credit loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3,699
2020	830
2019	3,360
2018	0
2017	0
Prior	0
Term Total	7,889
Revolving	558,634
Total	566,523
Total ending loans balance		535,071
Commercial and Industrial | Working capital lines of credit loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Term Total	0
Revolving	60,441
Total	60,441
Total ending loans balance		81,095
Commercial and Industrial | Working capital lines of credit loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	35
2018	0
2017	0
Prior	0
Term Total	35
Revolving	25,928
Total	25,963
Total ending loans balance		9,718
Commercial and Industrial | Working capital lines of credit loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial and Industrial | Working capital lines of credit loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		215
Commercial and Industrial | Non-working capital loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	208,363
2020	147,863
2019	81,630
2018	42,975
2017	27,358
Prior	20,355
Term Total	528,544
Revolving	207,115
Total	735,659
Total ending loans balance		1,158,827
Commercial and Industrial | Non-working capital loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	185,374
2020	139,157
2019	79,477
2018	38,899
2017	19,415
Prior	18,489
Term Total	480,811
Revolving	203,794
Total	684,605
Total ending loans balance		1,111,989
Commercial and Industrial | Non-working capital loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	17,728
2020	0
2019	225
2018	979
2017	2,350
Prior	1,426
Term Total	22,708
Revolving	0
Total	22,708
Total ending loans balance		26,523
Commercial and Industrial | Non-working capital loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,996
2020	6,948
2019	1,091
2018	2,534
2017	5,465
Prior	426
Term Total	19,460
Revolving	3,321
Total	22,781
Total ending loans balance		14,820
Commercial and Industrial | Non-working capital loans | Not Rated
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,265
2020	1,758
2019	837
2018	563
2017	128
Prior	14
Term Total	5,565
Revolving	0
Total	5,565
Commercial and Industrial | Non-working capital loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial and Industrial | Non-working capital loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		5,495
Commercial Real Estate and Multi-family Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		1,892,572
Commercial Real Estate and Multi-family Residential | Construction and land development loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	35,136
2020	30,224
2019	1,276
2018	998
2017	0
Prior	0
Term Total	67,634
Revolving	310,396
Total	378,030
Total ending loans balance		361,664
Commercial Real Estate and Multi-family Residential | Construction and land development loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	35,136
2020	30,224
2019	1,276
2018	998
2017	0
Prior	0
Term Total	67,634
Revolving	310,396
Total	378,030
Total ending loans balance		361,664
Commercial Real Estate and Multi-family Residential | Construction and land development loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Construction and land development loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Construction and land development loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Construction and land development loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Owner occupied loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	142,905
2020	170,974
2019	125,906
2018	87,761
2017	86,236
Prior	95,398
Term Total	709,180
Revolving	29,611
Total	738,791
Total ending loans balance		647,574
Commercial Real Estate and Multi-family Residential | Owner occupied loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	135,861
2020	169,404
2019	124,117
2018	85,070
2017	78,155
Prior	93,925
Term Total	686,532
Revolving	29,611
Total	716,143
Total ending loans balance		608,845
Commercial Real Estate and Multi-family Residential | Owner occupied loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	6,555
2020	0
2019	880
2018	933
2017	7,387
Prior	1,235
Term Total	16,990
Revolving	0
Total	16,990
Total ending loans balance		31,355
Commercial Real Estate and Multi-family Residential | Owner occupied loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	489
2020	1,570
2019	909
2018	1,758
2017	694
Prior	238
Term Total	5,658
Revolving	0
Total	5,658
Total ending loans balance		7,374
Commercial Real Estate and Multi-family Residential | Owner occupied loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Owner occupied loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Nonowner occupied loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	158,167
2020	154,764
2019	107,262
2018	19,054
2017	31,023
Prior	73,407
Term Total	543,677
Revolving	44,362
Total	588,039
Total ending loans balance		579,050
Commercial Real Estate and Multi-family Residential | Nonowner occupied loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	146,342
2020	154,433
2019	107,262
2018	19,054
2017	31,023
Prior	59,154
Term Total	517,268
Revolving	44,362
Total	561,630
Total ending loans balance		547,790
Commercial Real Estate and Multi-family Residential | Nonowner occupied loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	11,825
2020	331
2019	0
2018	0
2017	0
Prior	14,253
Term Total	26,409
Revolving	0
Total	26,409
Total ending loans balance		31,260
Commercial Real Estate and Multi-family Residential | Nonowner occupied loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Nonowner occupied loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Nonowner occupied loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Multi-family loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	84,678
2020	53,195
2019	36,575
2018	12,286
2017	36,826
Prior	9,793
Term Total	233,353
Revolving	13,434
Total	246,787
Total ending loans balance		304,284
Commercial Real Estate and Multi-family Residential | Multi-family loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	84,678
2020	53,195
2019	36,575
2018	12,286
2017	14,574
Prior	9,793
Term Total	211,101
Revolving	13,434
Total	224,535
Total ending loans balance		282,031
Commercial Real Estate and Multi-family Residential | Multi-family loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	22,252
Prior	0
Term Total	22,252
Revolving	0
Total	22,252
Total ending loans balance		22,253
Commercial Real Estate and Multi-family Residential | Multi-family loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Multi-family loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Commercial Real Estate and Multi-family Residential | Multi-family loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Agri-business and Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		429,662
Agri-business and Agricultural | Loans secured by farmland
Financing Receivable, Credit Quality Indicator [Line Items]
2021	47,739
2020	39,020
2019	18,552
2018	10,469
2017	10,634
Prior	17,196
Term Total	143,610
Revolving	62,692
Total	206,302
Total ending loans balance		195,363
Agri-business and Agricultural | Loans secured by farmland | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	47,532
2020	37,035
2019	16,249
2018	10,469
2017	10,454
Prior	17,021
Term Total	138,760
Revolving	61,774
Total	200,534
Total ending loans balance		183,983
Agri-business and Agricultural | Loans secured by farmland | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	1,985
2019	2,303
2018	0
2017	180
Prior	30
Term Total	4,498
Revolving	918
Total	5,416
Total ending loans balance		10,728
Agri-business and Agricultural | Loans secured by farmland | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	207
2020	0
2019	0
2018	0
2017	0
Prior	145
Term Total	352
Revolving	0
Total	352
Total ending loans balance		652
Agri-business and Agricultural | Loans secured by farmland | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Agri-business and Agricultural | Loans secured by farmland | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Agri-business and Agricultural | Loans for agricultural production
Financing Receivable, Credit Quality Indicator [Line Items]
2021	36,686
2020	34,497
2019	5,395
2018	11,072
2017	1,331
Prior	4,178
Term Total	93,159
Revolving	146,414
Total	239,573
Total ending loans balance		234,299
Agri-business and Agricultural | Loans for agricultural production | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	36,238
2020	25,855
2019	4,224
2018	11,072
2017	1,331
Prior	4,178
Term Total	82,898
Revolving	138,142
Total	221,040
Total ending loans balance		185,875
Agri-business and Agricultural | Loans for agricultural production | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	448
2020	8,642
2019	1,171
2018	0
2017	0
Prior	0
Term Total	10,261
Revolving	8,272
Total	18,533
Total ending loans balance		48,424
Agri-business and Agricultural | Loans for agricultural production | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Agri-business and Agricultural | Loans for agricultural production | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Agri-business and Agricultural | Loans for agricultural production | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Agri-business and Agricultural | Other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		93,912
Agri-business and Agricultural | Other commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		93,912
Agri-business and Agricultural | Other commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Agri-business and Agricultural | Other commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Agri-business and Agricultural | Other commercial loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Agri-business and Agricultural | Other commercial loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		344,699
Consumer 1-4 Family Mortgage | Closed end first mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	59,724
2020	43,911
2019	14,560
2018	11,120
2017	10,677
Prior	30,816
Term Total	170,808
Revolving	5,487
Total	176,295
Total ending loans balance		167,501
Consumer 1-4 Family Mortgage | Closed end first mortgage loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	14,635
2020	16,173
2019	5,312
2018	5,903
2017	3,049
Prior	3,221
Term Total	48,293
Revolving	5,005
Total	53,298
Total ending loans balance		40,682
Consumer 1-4 Family Mortgage | Closed end first mortgage loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Closed end first mortgage loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	1,274
Term Total	1,274
Revolving	0
Total	1,274
Total ending loans balance		1,695
Consumer 1-4 Family Mortgage | Closed end first mortgage loans | Not Rated
Financing Receivable, Credit Quality Indicator [Line Items]
2021	45,089
2020	27,738
2019	9,248
2018	5,217
2017	7,628
Prior	26,321
Term Total	121,241
Revolving	482
Total	121,723
Consumer 1-4 Family Mortgage | Closed end first mortgage loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Closed end first mortgage loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		125,124
Consumer 1-4 Family Mortgage | Open end and junior lien loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	22,624
2020	6,003
2019	6,146
2018	4,212
2017	1,653
Prior	1,526
Term Total	42,164
Revolving	115,695
Total	157,859
Total ending loans balance		165,236
Consumer 1-4 Family Mortgage | Open end and junior lien loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	679
2020	379
2019	159
2018	313
2017	0
Prior	0
Term Total	1,530
Revolving	5,074
Total	6,604
Total ending loans balance		8,424
Consumer 1-4 Family Mortgage | Open end and junior lien loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Open end and junior lien loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Term Total	0
Revolving	98
Total	98
Total ending loans balance		5
Consumer 1-4 Family Mortgage | Open end and junior lien loans | Not Rated
Financing Receivable, Credit Quality Indicator [Line Items]
2021	21,945
2020	5,624
2019	5,987
2018	3,899
2017	1,653
Prior	1,526
Term Total	40,634
Revolving	110,523
Total	151,157
Consumer 1-4 Family Mortgage | Open end and junior lien loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Open end and junior lien loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		156,807
Consumer 1-4 Family Mortgage | Residential construction loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	7,926
2020	1,537
2019	960
2018	138
2017	171
Prior	1,125
Term Total	11,857
Revolving	0
Total	11,857
Total ending loans balance		11,962
Consumer 1-4 Family Mortgage | Residential construction loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Residential construction loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Residential construction loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Residential construction loans | Not Rated
Financing Receivable, Credit Quality Indicator [Line Items]
2021	7,926
2020	1,537
2019	960
2018	138
2017	171
Prior	1,125
Term Total	11,857
Revolving	0
Total	11,857
Consumer 1-4 Family Mortgage | Residential construction loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Residential construction loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		11,962
Consumer 1-4 Family Mortgage | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	25,089
2020	15,911
2019	9,227
2018	5,844
2017	3,045
Prior	1,203
Term Total	60,319
Revolving	22,225
Total	82,544
Consumer 1-4 Family Mortgage | Other consumer loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3,401
2020	957
2019	1,523
2018	0
2017	1,155
Prior	0
Term Total	7,036
Revolving	12,998
Total	20,034
Consumer 1-4 Family Mortgage | Other consumer loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2021	36
2020	23
2019	230
2018	0
2017	0
Prior	0
Term Total	289
Revolving	0
Total	289
Consumer 1-4 Family Mortgage | Other consumer loans | Not Rated
Financing Receivable, Credit Quality Indicator [Line Items]
2021	21,652
2020	14,931
2019	7,474
2018	5,844
2017	1,890
Prior	1,203
Term Total	52,994
Revolving	9,227
Total	62,221
Consumer 1-4 Family Mortgage | Total consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		103,385
Consumer 1-4 Family Mortgage | Total consumer loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		36,979
Consumer 1-4 Family Mortgage | Total consumer loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		253
Consumer 1-4 Family Mortgage | Total consumer loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Total consumer loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		0
Consumer 1-4 Family Mortgage | Total consumer loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loans balance		$ 66,153
Other commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	6,556
2020	21,111
2019	3,243
2018	1,273
2017	8,592
Prior	11,258
Term Total	52,033
Revolving	21,145
Total	73,178
Other commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	6,556
2020	21,111
2019	3,243
2018	1,273
2017	8,592
Prior	7,460
Term Total	48,235
Revolving	21,145
Total	69,380
Other commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	3,798
Term Total	3,798
Revolving	0
Total	$ 3,798