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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Risk Rating (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one $ 132,595 $ 121,811
Year two 103,467 168,238
Year three 153,099 261,269
Year four 238,818 349,214
Year five 324,297 153,207
Prior 302,906 225,687
Revolving 67,828 88,929
Revolving to Term 0 626
Total loans receivable 1,323,010 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 74 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 163 221
Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 49,611 49,753
Year two 49,278 77,787
Year three 74,624 126,597
Year four 102,688 209,738
Year five 200,081 89,753
Prior 197,217 145,712
Revolving 8,941 7,669
Revolving to Term 0 0
Total loans receivable 682,440 707,009
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 13,527 3,556
Year two 2,551 11,072
Year three 6,394 17,637
Year four 16,190 15,200
Year five 9,466 7,335
Prior 15,217 17,223
Revolving 656 715
Revolving to Term 0 0
Total loans receivable 64,001 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 20,683 8,777
Year two 8,633 7,790
Year three 7,671 40,426
Year four 56,177 101,213
Year five 97,678 43,115
Prior 45,846 19,005
Revolving 380 380
Revolving to Term 0 0
Total loans receivable 237,068 220,706
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 22,682 23,832
Year two 13,350 25,102
Year three 26,836 10,186
Year four 9,012 346
Year five 259 1,297
Prior 1,981 971
Revolving 234 16,412
Revolving to Term 0 0
Total loans receivable 74,354 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 12,357 17,599
Year two 17,648 13,549
Year three 10,105 31,479
Year four 23,021 14,043
Year five 9,313 8,787
Prior 9,557 4,197
Revolving 19,534 25,255
Revolving to Term 0 626
Total loans receivable 101,535 115,535
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 23 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 94 143
C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 3,944 3,373
Year two 1,181 3,111
Year three 2,547 3,617
Year four 2,212 920
Year five 405 438
Prior 1,151 1,884
Revolving 18,638 17,674
Revolving to Term 0 0
Total loans receivable 30,078 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 8,649 13,400
Year two 9,883 28,598
Year three 24,140 30,516
Year four 29,056 7,369
Year five 6,887 2,141
Prior 29,203 32,511
Revolving 17,016 17,357
Revolving to Term 0 0
Total loans receivable 124,834 131,892
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 1,979 2,956
Revolving to Term 0 0
Total loans receivable 1,979 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 2,566 3,970
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 2,566 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 1,142 1,521
Year two 943 1,229
Year three 782 811
Year four 462 385
Year five 208 341
Prior 168 214
Revolving 450 511
Revolving to Term 0 0
Total loans receivable 4,155 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 49,611 49,580
Year two 48,332 76,381
Year three 73,187 123,806
Year four 99,390 207,155
Year five 195,318 89,539
Prior 189,575 141,264
Revolving 8,917 7,669
Revolving to Term 0 0
Total loans receivable 664,330 695,394
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Agricultural real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 13,527 3,556
Year two 2,551 10,870
Year three 6,197 17,160
Year four 16,190 10,098
Year five 9,466 7,335
Prior 15,055 16,642
Revolving 656 715
Revolving to Term 0 0
Total loans receivable 63,642 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 20,683 8,777
Year two 8,633 7,790
Year three 7,671 40,426
Year four 56,177 101,213
Year five 88,708 43,115
Prior 45,846 19,005
Revolving 380 380
Revolving to Term 0 0
Total loans receivable 228,098 220,706
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 22,682 23,832
Year two 13,350 25,102
Year three 26,836 10,186
Year four 9,012 346
Year five 259 1,297
Prior 1,981 868
Revolving 234 16,412
Revolving to Term 0 0
Total loans receivable 74,354 78,043
Risk rating 1 to 5 | C&I/Agricultural operating: | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 12,127 17,599
Year two 16,854 13,049
Year three 8,390 28,343
Year four 20,059 13,629
Year five 8,871 8,787
Prior 9,419 4,197
Revolving 18,446 24,809
Revolving to Term 0 0
Total loans receivable 94,166 110,413
Risk rating 1 to 5 | C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 3,944 3,373
Year two 1,181 3,062
Year three 2,501 3,144
Year four 2,212 563
Year five 375 198
Prior 948 1,884
Revolving 18,438 17,609
Revolving to Term 0 0
Total loans receivable 29,599 29,833
Risk rating 1 to 5 | Residential mortgage: | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 8,649 13,400
Year two 9,883 28,598
Year three 24,140 30,386
Year four 29,056 7,369
Year five 6,753 2,141
Prior 27,094 30,004
Revolving 16,916 17,349
Revolving to Term 0 0
Total loans receivable 122,491 129,247
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 1,862 2,839
Revolving to Term 0 0
Total loans receivable 1,862 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 2,536 3,944
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 2,536 3,944
Risk rating 1 to 5 | Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 1,142 1,519
Year two 942 1,229
Year three 782 811
Year four 462 385
Year five 208 341
Prior 168 214
Revolving 448 511
Revolving to Term 0 0
Total loans receivable 4,152 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 776 1,406
Year three 119 2,238
Year four 2,207 138
Year five 2,794 0
Prior 3,481 0
Revolving 24 0
Revolving to Term 0 0
Total loans receivable 9,401 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 139 140
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 139 140
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 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 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 230 0
Year two 794 0
Year three 1,435 3,062
Year four 2,221 13
Year five 61 0
Prior 138 0
Revolving 556 292
Revolving to Term 0 626
Total loans receivable 5,435 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 46 0
Year four 0 37
Year five 30 240
Prior 203 0
Revolving 200 65
Revolving to Term 0 0
Total loans receivable 479 391
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 1,318 553
Year four 1,091 2,445
Year five 1,969 214
Prior 4,161 4,448
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 8,709 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 197 477
Year four 0 5,102
Year five 0 0
Prior 23 441
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 220 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 8,970 0
Prior 0 0
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 8,970 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 280 74
Year four 741 401
Year five 381 0
Prior 0 0
Revolving 532 154
Revolving to Term 0 0
Total loans receivable 1,934 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 134 0
Prior 2,109 2,507
Revolving 100 8
Revolving to Term 0 0
Total loans receivable 2,343 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 30 26
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 30 26
Risk rating 7 | Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 2
Year two 1 0
Year three 0 0
Year four 0 0
Year five 0 0
Prior 0 0
Revolving 2 0
Revolving to Term 0 0
Total loans receivable $ 3 $ 2