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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Risk Rating (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one $ 108,794 $ 121,811
Year two 107,708 168,238
Year three 155,999 261,269
Year four 250,363 349,214
Year five 333,766 153,207
Prior 316,755 225,687
Revolving 72,235 88,929
Revolving to Term 0 626
Total loans receivable 1,345,620 1,368,981
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 3 135
Current period gross charge-offs, Year three 46 10
Current period gross charge-offs, Year four 67 40
Current period gross charge-offs, Year five 0 5
Current period gross charge-offs, Prior 1 21
Current period gross charge-offs, Revolving 39 10
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 156 221
Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 44,115 49,753
Year two 50,776 77,787
Year three 76,384 126,597
Year four 106,030 209,738
Year five 202,684 89,753
Prior 202,645 145,712
Revolving 9,209 7,669
Revolving to Term 0 0
Total loans receivable 691,843 707,009
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 51 39
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 51 39
Commercial/Agricultural Real Estate | Agricultural real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 8,567 3,556
Year two 2,843 11,072
Year three 6,636 17,637
Year four 16,369 15,200
Year five 14,651 7,335
Prior 19,255 17,223
Revolving 644 715
Revolving to Term 0 0
Total loans receivable 68,965 72,738
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 | Multi-family real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 20,800 8,777
Year two 8,679 7,790
Year three 7,711 40,426
Year four 56,597 101,213
Year five 98,299 43,115
Prior 46,306 19,005
Revolving 431 380
Revolving to Term 0 0
Total loans receivable 238,823 220,706
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 19,356 23,832
Year two 13,758 25,102
Year three 24,874 10,186
Year four 9,481 346
Year five 329 1,297
Prior 2,124 971
Revolving 86 16,412
Revolving to Term 0 0
Total loans receivable 70,008 78,146
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 8,401 17,599
Year two 17,694 13,549
Year three 10,491 31,479
Year four 29,474 14,043
Year five 9,972 8,787
Prior 10,669 4,197
Revolving 22,347 25,255
Revolving to Term 0 626
Total loans receivable 109,048 115,535
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 0 131
Current period gross charge-offs, Year three 36 7
Current period gross charge-offs, Year four 16 0
Current period gross charge-offs, Year five 0 5
Current period gross charge-offs, Prior 0 0
Current period gross charge-offs, Revolving 35 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 87 143
C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 3,613 3,373
Year two 1,919 3,111
Year three 2,715 3,617
Year four 2,236 920
Year five 418 438
Prior 2,054 1,884
Revolving 18,940 17,674
Revolving to Term 0 0
Total loans receivable 31,895 31,017
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 3,204 13,400
Year two 10,928 28,598
Year three 26,288 30,516
Year four 29,641 7,369
Year five 7,151 2,141
Prior 30,481 32,511
Revolving 17,743 17,357
Revolving to Term 0 0
Total loans receivable 125,436 131,892
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 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 4
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 2,368 2,956
Revolving to Term 0 0
Total loans receivable 2,368 2,956
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 2,959 3,970
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 2,959 3,970
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 17
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 17
Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 738 1,521
Year two 1,111 1,229
Year three 900 811
Year four 535 385
Year five 262 341
Prior 262 214
Revolving 467 511
Revolving to Term 0 0
Total loans receivable 4,275 5,012
Current period gross charge-offs, Year one 0 0
Current period gross charge-offs, Year two 3 4
Current period gross charge-offs, Year three 10 3
Current period gross charge-offs, Year four 0 1
Current period gross charge-offs, Year five 0 0
Current period gross charge-offs, Prior 0 0
Current period gross charge-offs, Revolving 4 10
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 17 18
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 44,115 49,580
Year two 50,606 76,381
Year three 74,412 123,806
Year four 102,712 207,155
Year five 200,569 89,539
Prior 194,917 141,264
Revolving 9,209 7,669
Revolving to Term 0 0
Total loans receivable 676,540 695,394
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Agricultural real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 8,567 3,556
Year two 2,843 10,870
Year three 6,435 17,160
Year four 16,349 10,098
Year five 9,790 7,335
Prior 18,751 16,642
Revolving 644 715
Revolving to Term 0 0
Total loans receivable 63,379 66,376
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Multi-family real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 20,800 8,777
Year two 8,679 7,790
Year three 7,711 40,426
Year four 56,597 101,213
Year five 89,326 43,115
Prior 46,306 19,005
Revolving 431 380
Revolving to Term 0 0
Total loans receivable 229,850 220,706
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 19,356 23,832
Year two 13,758 25,102
Year three 24,874 10,186
Year four 9,481 346
Year five 329 1,297
Prior 2,124 868
Revolving 86 16,412
Revolving to Term 0 0
Total loans receivable 70,008 78,043
Risk rating 1 to 5 | C&I/Agricultural operating: | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 8,161 17,599
Year two 16,884 13,049
Year three 8,605 28,343
Year four 26,589 13,629
Year five 9,522 8,787
Prior 10,511 4,197
Revolving 20,955 24,809
Revolving to Term 0 0
Total loans receivable 101,227 110,413
Risk rating 1 to 5 | C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 3,613 3,373
Year two 1,919 3,062
Year three 2,668 3,144
Year four 2,236 563
Year five 385 198
Prior 1,852 1,884
Revolving 18,769 17,609
Revolving to Term 0 0
Total loans receivable 31,442 29,833
Risk rating 1 to 5 | Residential mortgage: | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 3,204 13,400
Year two 10,928 28,598
Year three 26,288 30,386
Year four 29,641 7,369
Year five 7,016 2,141
Prior 28,110 30,004
Revolving 17,643 17,349
Revolving to Term 0 0
Total loans receivable 122,830 129,247
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 2,251 2,839
Revolving to Term 0 0
Total loans receivable 2,251 2,839
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 2,927 3,944
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 2,927 3,944
Risk rating 1 to 5 | Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 738 1,519
Year two 1,109 1,229
Year three 900 811
Year four 535 385
Year five 262 341
Prior 262 214
Revolving 467 511
Revolving to Term 0 0
Total loans receivable 4,273 5,010
Risk rating 6 | Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 173
Year two 0 1,406
Year three 1,301 2,238
Year four 2,218 138
Year five 39 0
Prior 3,528 0
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 7,086 3,955
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 0
Year three 0 0
Year four 0 0
Year five 0 0
Prior 138 140
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 138 140
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 8,973 0
Prior 0 0
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 8,973 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 0 103
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 0 103
Risk rating 6 | C&I/Agricultural operating: | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 240 0
Year two 810 0
Year three 1,516 3,062
Year four 2,868 13
Year five 69 0
Prior 158 0
Revolving 856 292
Revolving to Term 0 626
Total loans receivable 6,517 3,993
Risk rating 6 | C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 49
Year three 47 0
Year four 0 37
Year five 33 240
Prior 202 0
Revolving 171 65
Revolving to Term 0 0
Total loans receivable 453 391
Risk rating 7 | Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 170 0
Year three 671 553
Year four 1,100 2,445
Year five 2,076 214
Prior 4,200 4,448
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 8,217 7,660
Risk rating 7 | Commercial/Agricultural Real Estate | Agricultural real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 202
Year three 201 477
Year four 20 5,102
Year five 4,861 0
Prior 366 441
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 5,448 6,222
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 0
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 0 0
Risk rating 7 | C&I/Agricultural operating: | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 500
Year three 370 74
Year four 17 401
Year five 381 0
Prior 0 0
Revolving 536 154
Revolving to Term 0 0
Total loans receivable 1,304 1,129
Risk rating 7 | C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 473
Year four 0 320
Year five 0 0
Prior 0 0
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 0 793
Risk rating 7 | Residential mortgage: | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 130
Year four 0 0
Year five 135 0
Prior 2,371 2,507
Revolving 100 8
Revolving to Term 0 0
Total loans receivable 2,606 2,645
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 117 117
Revolving to Term 0 0
Total loans receivable 117 117
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 32 26
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 32 26
Risk rating 7 | Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 2
Year two 2 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 $ 2 $ 2