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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Risk Rating (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one $ 24,571 $ 190,301
Year two 196,312 313,863
Year three 304,894 420,211
Year four 404,396 172,168
Year five 162,893 93,413
Prior 277,827 201,004
Revolving 79,266 69,766
Revolving to Term 0 66
Total loans receivable 1,450,159 1,460,792
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 2
Current period gross charge-offs, Year three 2 21
Current period gross charge-offs, Year four 0 43
Current period gross charge-offs, Year five 0 3
Current period gross charge-offs, Prior 1 91
Current period gross charge-offs, Revolving 2 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 5 160
Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 12,070 73,898
Year two 73,823 134,279
Year three 135,698 249,497
Year four 241,457 95,429
Year five 94,949 71,287
Prior 175,179 113,853
Revolving 10,454 10,204
Revolving to Term 0 0
Total loans receivable 743,630 748,447
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 0
Current period gross charge-offs, Year three 0 10
Current period gross charge-offs, Year four 0 0
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 0 4
Current period gross charge-offs, Revolving 0 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 0 14
Commercial/Agricultural Real Estate | Agricultural real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 655 16,335
Year two 14,412 19,557
Year three 18,763 16,991
Year four 16,729 7,719
Year five 7,663 5,646
Prior 20,982 15,900
Revolving 1,063 1,009
Revolving to Term 0 0
Total loans receivable 80,267 83,157
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 0
Current period gross charge-offs, Year three 0 0
Current period gross charge-offs, Year four 0 32
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 0 0
Current period gross charge-offs, Revolving 0 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 0 32
Commercial/Agricultural Real Estate | Multi-family real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 2,085 5,016
Year two 5,143 50,617
Year three 50,345 95,686
Year four 103,831 45,685
Year five 45,318 8,591
Prior 28,500 22,364
Revolving 96 45
Revolving to Term 0 0
Total loans receivable 235,318 228,004
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 0
Current period gross charge-offs, Year three 0 0
Current period gross charge-offs, Year four 0 0
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 0 0
Current period gross charge-offs, Revolving 0 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 0 0
Commercial/Agricultural Real Estate | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 1,814 42,639
Year two 50,215 37,783
Year three 30,065 18,912
Year four 6,169 8,014
Year five 1,368 119
Prior 1,337 1,288
Revolving 2,087 1,463
Revolving to Term 0 0
Total loans receivable 93,055 110,218
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 0
Current period gross charge-offs, Year three 0 0
Current period gross charge-offs, Year four 0 0
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 0 0
Current period gross charge-offs, Revolving 0 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 0 0
C&I/Agricultural operating: | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 3,227 16,758
Year two 15,970 31,915
Year three 31,585 28,059
Year four 26,230 11,406
Year five 10,087 4,751
Prior 6,115 2,025
Revolving 34,797 26,259
Revolving to Term 0 17
Total loans receivable 128,011 121,190
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 0
Current period gross charge-offs, Year three 0 0
Current period gross charge-offs, Year four 0 0
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 0 0
Current period gross charge-offs, Revolving 0 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 0 0
C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 1,499 4,734
Year two 4,391 4,384
Year three 3,989 1,560
Year four 1,422 746
Year five 688 295
Prior 2,307 2,145
Revolving 11,948 11,831
Revolving to Term 0 0
Total loans receivable 26,244 25,695
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 0
Current period gross charge-offs, Year three 0 0
Current period gross charge-offs, Year four 0 0
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 0 0
Current period gross charge-offs, Revolving 0 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 0 0
Residential mortgage: | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 2,793 28,808
Year two 30,478 33,801
Year three 33,142 8,743
Year four 7,933 2,610
Year five 2,326 2,306
Prior 37,033 36,619
Revolving 15,434 15,544
Revolving to Term 0 48
Total loans receivable 129,139 128,479
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 0
Current period gross charge-offs, Year three 0 10
Current period gross charge-offs, Year four 0 0
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 0 68
Current period gross charge-offs, Revolving 0 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 0 78
Residential mortgage: | Purchased HELOC loans    
Accounts, Notes, Loans and Financing Receivable [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
Revolving 2,895 2,880
Revolving to Term 0 0
Total loans receivable 2,895 2,880
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 0
Current period gross charge-offs, Year three 0 0
Current period gross charge-offs, Year four 0 0
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 0 0
Current period gross charge-offs, Revolving 0 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 0 0
Consumer installment: | Originated indirect paper    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
Prior 5,851 6,535
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 5,851 6,535
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 0
Current period gross charge-offs, Year three 0 0
Current period gross charge-offs, Year four 0 0
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 1 13
Current period gross charge-offs, Revolving 0 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 1 13
Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 428 2,113
Year two 1,880 1,527
Year three 1,307 763
Year four 625 559
Year five 494 418
Prior 523 275
Revolving 492 531
Revolving to Term 0 1
Total loans receivable 5,749 6,187
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 2
Current period gross charge-offs, Year three 2 1
Current period gross charge-offs, Year four 0 11
Current period gross charge-offs, Year five 0 3
Current period gross charge-offs, Prior 0 6
Current period gross charge-offs, Revolving 2 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 4 23
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 12,070 73,564
Year two 73,515 133,583
Year three 135,002 236,774
Year four 233,638 90,881
Year five 94,729 71,104
Prior 170,326 107,999
Revolving 10,454 10,204
Revolving to Term 0 0
Total loans receivable 729,734 724,109
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Agricultural real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 655 16,335
Year two 14,412 19,026
Year three 18,239 11,582
Year four 11,371 7,719
Year five 7,663 5,463
Prior 20,339 15,418
Revolving 1,063 1,009
Revolving to Term 0 0
Total loans receivable 73,742 76,552
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Multi-family real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 2,085 5,016
Year two 5,143 50,617
Year three 50,345 95,686
Year four 103,831 45,685
Year five 45,318 8,591
Prior 28,500 22,364
Revolving 96 45
Revolving to Term 0 0
Total loans receivable 235,318 228,004
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 1,814 42,639
Year two 50,215 37,783
Year three 30,065 18,912
Year four 6,169 8,014
Year five 1,368 119
Prior 1,228 1,124
Revolving 1,938 1,314
Revolving to Term 0 0
Total loans receivable 92,797 109,905
Risk rating 1 to 5 | C&I/Agricultural operating: | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 3,227 16,758
Year two 15,954 31,915
Year three 31,585 28,059
Year four 25,779 11,406
Year five 10,087 4,746
Prior 6,111 2,023
Revolving 32,497 24,059
Revolving to Term 0 0
Total loans receivable 125,240 118,966
Risk rating 1 to 5 | C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 1,499 4,734
Year two 4,391 3,908
Year three 3,516 856
Year four 789 746
Year five 688 295
Prior 2,307 2,144
Revolving 11,948 11,831
Revolving to Term 0 0
Total loans receivable 25,138 24,514
Risk rating 1 to 5 | Residential mortgage: | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 2,793 28,808
Year two 30,478 33,660
Year three 33,007 8,743
Year four 7,933 2,610
Year five 2,326 2,292
Prior 34,157 33,744
Revolving 15,434 15,544
Revolving to Term 0 0
Total loans receivable 126,128 125,401
Risk rating 1 to 5 | Residential mortgage: | Purchased HELOC loans    
Accounts, Notes, Loans and Financing Receivable [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
Revolving 2,895 2,880
Revolving to Term 0 0
Total loans receivable 2,895 2,880
Risk rating 1 to 5 | Consumer installment: | Originated indirect paper    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
Prior 5,805 6,491
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 5,805 6,491
Risk rating 1 to 5 | Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 428 2,104
Year two 1,873 1,525
Year three 1,306 763
Year four 625 559
Year five 494 402
Prior 522 274
Revolving 491 530
Revolving to Term 0 1
Total loans receivable 5,739 6,158
Risk rating 6 | Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 309
Year two 0 0
Year three 0 9,510
Year four 4,416 0
Year five 0 0
Prior 0 0
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 4,416 9,819
Risk rating 6 | Commercial/Agricultural Real Estate | Agricultural real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 171
Year three 170 5,409
Year four 5,358 0
Year five 0 152
Prior 614 482
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 6,142 6,214
Risk rating 6 | Commercial/Agricultural Real Estate | Multi-family real estate    
Accounts, Notes, Loans and Financing Receivable [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
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 0 0
Risk rating 6 | Commercial/Agricultural Real Estate | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
Prior 109 110
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 109 110
Risk rating 6 | C&I/Agricultural operating: | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 0
Year four 14 0
Year five 0 5
Prior 0 0
Revolving 2,300 2,200
Revolving to Term 0 0
Total loans receivable 2,314 2,205
Risk rating 6 | C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [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
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 0 0
Risk rating 7 | Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 25
Year two 308 696
Year three 696 3,213
Year four 3,403 4,548
Year five 220 183
Prior 4,853 5,854
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 9,480 14,519
Risk rating 7 | Commercial/Agricultural Real Estate | Agricultural real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 360
Year three 354 0
Year four 0 0
Year five 0 31
Prior 29 0
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 383 391
Risk rating 7 | Commercial/Agricultural Real Estate | Multi-family real estate    
Accounts, Notes, Loans and Financing Receivable [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
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 0 0
Risk rating 7 | Commercial/Agricultural Real Estate | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
Prior 0 54
Revolving 149 149
Revolving to Term 0 0
Total loans receivable 149 203
Risk rating 7 | C&I/Agricultural operating: | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 16 0
Year three 0 0
Year four 437 0
Year five 0 0
Prior 4 2
Revolving 0 0
Revolving to Term 0 17
Total loans receivable 457 19
Risk rating 7 | C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 476
Year three 473 704
Year four 633 0
Year five 0 0
Prior 0 1
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 1,106 1,181
Risk rating 7 | Residential mortgage: | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 141
Year three 135 0
Year four 0 0
Year five 0 14
Prior 2,876 2,875
Revolving 0 0
Revolving to Term 0 48
Total loans receivable 3,011 3,078
Risk rating 7 | Residential mortgage: | Purchased HELOC loans    
Accounts, Notes, Loans and Financing Receivable [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
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 0 0
Risk rating 7 | Consumer installment: | Originated indirect paper    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
Prior 46 44
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 46 44
Risk rating 7 | Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 9
Year two 7 2
Year three 1 0
Year four 0 0
Year five 0 16
Prior 1 1
Revolving 1 1
Revolving to Term 0 0
Total loans receivable $ 10 $ 29