LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Risk Rating (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	$ 94,905
2022	316,690
2021	435,071
2020	179,404
2019	96,851
Prior	218,956
Revolving	83,058
Revolving to Term	53
Total	1,424,988
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	21
Current period gross charge-offs, 2020	42
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	34
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	97
Commercial/Agricultural Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	22,448
2022	141,574
2021	258,839
2020	98,083
2019	73,188
Prior	125,884
Revolving	10,375
Revolving to Term	0
Total	730,391
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	10
Current period gross charge-offs, 2020	0
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	4
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	14
Commercial/Agricultural Real Estate | Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	13,788
2022	21,471
2021	17,054
2020	7,932
2019	5,832
Prior	18,565
Revolving	2,317
Revolving to Term	0
Total	86,959
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	0
Current period gross charge-offs, 2020	32
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	0
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	32
Commercial/Agricultural Real Estate | Multi-family real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	3,016
2022	42,403
2021	87,547
2020	46,598
2019	8,764
Prior	19,781
Revolving	0
Revolving to Term	0
Total	208,109
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	0
Current period gross charge-offs, 2020	0
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	0
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	0
Commercial/Agricultural Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	23,344
2022	37,514
2021	31,531
2020	9,151
2019	120
Prior	1,039
Revolving	2,192
Revolving to Term	0
Total	104,891
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	0
Current period gross charge-offs, 2020	0
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	0
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	0
C&I/Agricultural operating | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	11,045
2022	34,065
2021	27,896
2020	13,251
2019	5,562
Prior	3,231
Revolving	38,198
Revolving to Term	0
Total	133,248
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	0
Current period gross charge-offs, 2020	0
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	0
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	0
C&I/Agricultural operating | Agricultural operating
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	2,874
2022	3,782
2021	1,786
2020	890
2019	414
Prior	2,752
Revolving	11,883
Revolving to Term	0
Total	24,381
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	0
Current period gross charge-offs, 2020	0
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	0
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	0
Residential Mortgage | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	17,300
2022	33,892
2021	9,376
2020	2,727
2019	2,387
Prior	39,084
Revolving	14,299
Revolving to Term	53
Total	119,118
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	10
Current period gross charge-offs, 2020	0
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	14
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	24
Residential Mortgage | Purchased HELOC loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	3,216
Revolving to Term	0
Total	3,216
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	0
Current period gross charge-offs, 2020	0
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	0
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	0
Consumer Installment | Originated indirect paper
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	8,189
Revolving	0
Revolving to Term	0
Total	8,189
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	0
Current period gross charge-offs, 2020	0
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	13
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	13
Consumer Installment | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	1,090
2022	1,989
2021	1,042
2020	772
2019	584
Prior	431
Revolving	578
Revolving to Term	0
Total	6,486
Current period gross charge-offs, 2023	0
Current period gross charge-offs, 2022	0
Current period gross charge-offs, 2021	1
Current period gross charge-offs, 2020	10
Current period gross charge-offs, 2019	0
Current period gross charge-offs, Prior	3
Current period gross charge-offs, Revolving	0
Current period gross charge-offs, Revolving to Term	0
Current period gross charge-offs, Total	14
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	22,448
2022	141,385
2021	249,536
2020	93,201
2019	72,994
Prior	118,947
Revolving	10,375
Revolving to Term	0
Total	708,886
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	13,788
2022	20,893
2021	11,544
2020	7,932
2019	5,431
Prior	16,081
Revolving	2,317
Revolving to Term	0
Total	77,986
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Multi-family real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	3,016
2022	42,403
2021	87,547
2020	46,598
2019	8,764
Prior	19,781
Revolving	0
Revolving to Term	0
Total	208,109
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	23,344
2022	37,514
2021	31,531
2020	9,151
2019	120
Prior	832
Revolving	2,192
Revolving to Term	0
Total	104,684
Risk rating 1 to 5 | C&I/Agricultural operating | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	11,045
2022	34,065
2021	27,896
2020	13,251
2019	5,554
Prior	3,227
Revolving	35,328
Revolving to Term	0
Total	130,366
Risk rating 1 to 5 | C&I/Agricultural operating | Agricultural operating
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	2,778
2022	3,234
2021	986
2020	545
2019	378
Prior	2,500
Revolving	11,171
Revolving to Term	0
Total	21,592
Risk rating 1 to 5 | Residential Mortgage | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	17,300
2022	33,892
2021	9,376
2020	2,727
2019	2,373
Prior	36,053
Revolving	14,249
Revolving to Term	0
Total	115,970
Risk rating 1 to 5 | Residential Mortgage | Purchased HELOC loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	3,216
Revolving to Term	0
Total	3,216
Risk rating 1 to 5 | Consumer Installment | Originated indirect paper
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	8,148
Revolving	0
Revolving to Term	0
Total	8,148
Risk rating 1 to 5 | Consumer Installment | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	1,083
2022	1,989
2021	1,042
2020	772
2019	584
Prior	429
Revolving	577
Revolving to Term	0
Total	6,476
Risk rating 6 | Commercial/Agricultural Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	9,303
2020	331
2019	0
Prior	68
Revolving	0
Revolving to Term	0
Total	9,702
Risk rating 6 | Commercial/Agricultural Real Estate | Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	173
2021	5,510
2020	0
2019	300
Prior	742
Revolving	0
Revolving to Term	0
Total	6,725
Risk rating 6 | Commercial/Agricultural Real Estate | Multi-family real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 6 | Commercial/Agricultural Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	113
Revolving	0
Revolving to Term	0
Total	113
Risk rating 6 | C&I/Agricultural operating | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	2,870
Revolving to Term	0
Total	2,870
Risk rating 6 | C&I/Agricultural operating | Agricultural operating
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	96
2022	0
2021	50
2020	345
2019	0
Prior	0
Revolving	563
Revolving to Term	0
Total	1,054
Risk rating 6 | Residential Mortgage | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 6 | Residential Mortgage | Purchased HELOC loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 6 | Consumer Installment | Originated indirect paper
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 6 | Consumer Installment | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 7 | Commercial/Agricultural Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	189
2021	0
2020	4,551
2019	194
Prior	6,869
Revolving	0
Revolving to Term	0
Total	11,803
Risk rating 7 | Commercial/Agricultural Real Estate | Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	405
2021	0
2020	0
2019	101
Prior	1,742
Revolving	0
Revolving to Term	0
Total	2,248
Risk rating 7 | Commercial/Agricultural Real Estate | Multi-family real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 7 | Commercial/Agricultural Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	94
Revolving	0
Revolving to Term	0
Total	94
Risk rating 7 | C&I/Agricultural operating | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	8
Prior	4
Revolving	0
Revolving to Term	0
Total	12
Risk rating 7 | C&I/Agricultural operating | Agricultural operating
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	548
2021	750
2020	0
2019	36
Prior	252
Revolving	149
Revolving to Term	0
Total	1,735
Risk rating 7 | Residential Mortgage | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	14
Prior	3,031
Revolving	50
Revolving to Term	53
Total	3,148
Risk rating 7 | Residential Mortgage | Purchased HELOC loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 7 | Consumer Installment | Originated indirect paper
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	41
Revolving	0
Revolving to Term	0
Total	41
Risk rating 7 | Consumer Installment | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	7
2022	0
2021	0
2020	0
2019	0
Prior	2
Revolving	1
Revolving to Term	0
Total	10
Risk rating 8 | Commercial/Agricultural Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 8 | Commercial/Agricultural Real Estate | Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 8 | Commercial/Agricultural Real Estate | Multi-family real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 8 | Commercial/Agricultural Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 8 | C&I/Agricultural operating | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 8 | C&I/Agricultural operating | Agricultural operating
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 8 | Residential Mortgage | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 8 | Residential Mortgage | Purchased HELOC loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 8 | Consumer Installment | Originated indirect paper
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 8 | Consumer Installment | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | Commercial/Agricultural Real Estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | Commercial/Agricultural Real Estate | Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | Commercial/Agricultural Real Estate | Multi-family real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | Commercial/Agricultural Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | C&I/Agricultural operating | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | C&I/Agricultural operating | Agricultural operating
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | Residential Mortgage | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | Residential Mortgage | Purchased HELOC loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | Consumer Installment | Originated indirect paper
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	0
Risk rating 9 | Consumer Installment | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to Term	0
Total	$ 0