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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, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one $ 41,421 $ 121,811
Year two 112,419 168,238
Year three 157,419 261,269
Year four 272,043 349,214
Year five 341,447 153,207
Prior 359,277 225,687
Revolving 68,702 88,929
Revolving to Term 0 626
Total loans receivable 1,352,728 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 6 10
Current period gross charge-offs, Year four 51 40
Current period gross charge-offs, Year five 0 5
Current period gross charge-offs, Prior 0 21
Current period gross charge-offs, Revolving 22 10
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 82 221
Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 15,610 49,753
Year two 50,011 77,787
Year three 77,318 126,597
Year four 123,876 209,738
Year five 205,936 89,753
Prior 226,833 145,712
Revolving 8,410 7,669
Revolving to Term 0 0
Total loans receivable 707,994 707,009
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 5,413 3,556
Year two 3,443 11,072
Year three 6,774 17,637
Year four 17,121 15,200
Year five 14,938 7,335
Prior 22,127 17,223
Revolving 910 715
Revolving to Term 0 0
Total loans receivable 70,726 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 7,376 8,777
Year two 8,729 7,790
Year three 7,749 40,426
Year four 57,058 101,213
Year five 98,946 43,115
Prior 57,437 19,005
Revolving 441 380
Revolving to Term 0 0
Total loans receivable 237,736 220,706
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 6,745 23,832
Year two 16,660 25,102
Year three 22,145 10,186
Year four 10,033 346
Year five 342 1,297
Prior 2,144 971
Revolving 89 16,412
Revolving to Term 0 0
Total loans receivable 58,158 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 2,578 17,599
Year two 17,223 13,549
Year three 11,981 31,479
Year four 30,533 14,043
Year five 12,940 8,787
Prior 11,960 4,197
Revolving 22,264 25,255
Revolving to Term 0 626
Total loans receivable 109,479 115,535
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 0 7
Current period gross charge-offs, Year four 0 0
Current period gross charge-offs, Year five 0 5
Current period gross charge-offs, Prior 0 0
Current period gross charge-offs, Revolving 20 0
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 20 143
C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 2,202 3,373
Year two 2,122 3,111
Year three 2,806 3,617
Year four 2,786 920
Year five 807 438
Prior 2,227 1,884
Revolving 16,379 17,674
Revolving to Term 0 0
Total loans receivable 29,329 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 1,026 13,400
Year two 12,935 28,598
Year three 27,581 30,516
Year four 30,019 7,369
Year five 7,233 2,141
Prior 32,650 32,511
Revolving 17,189 17,357
Revolving to Term 0 0
Total loans receivable 128,633 131,892
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 2,560 2,956
Revolving to Term 0 0
Total loans receivable 2,560 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 3,434 3,970
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 3,434 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 0 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 0 17
Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 471 1,521
Year two 1,296 1,229
Year three 1,065 811
Year four 617 385
Year five 305 341
Prior 465 214
Revolving 460 511
Revolving to Term 0 0
Total loans receivable 4,679 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 6 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 2 10
Current period gross charge-offs, Revolving to Term 0 0
Current period gross charge-offs, Total 11 18
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 15,610 49,580
Year two 49,839 76,381
Year three 75,320 123,806
Year four 120,536 207,155
Year five 203,782 89,539
Prior 218,775 141,264
Revolving 8,410 7,669
Revolving to Term 0 0
Total loans receivable 692,272 695,394
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Agricultural real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 5,413 3,556
Year two 3,443 10,870
Year three 6,573 17,160
Year four 16,743 10,098
Year five 9,960 7,335
Prior 21,611 16,642
Revolving 910 715
Revolving to Term 0 0
Total loans receivable 64,653 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 7,376 8,777
Year two 8,729 7,790
Year three 7,749 40,426
Year four 57,058 101,213
Year five 98,946 43,115
Prior 57,437 19,005
Revolving 441 380
Revolving to Term 0 0
Total loans receivable 237,736 220,706
Risk rating 1 to 5 | Commercial/Agricultural Real Estate | Construction and land development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 6,745 23,832
Year two 16,660 25,102
Year three 22,145 10,186
Year four 10,033 346
Year five 342 1,297
Prior 2,144 868
Revolving 89 16,412
Revolving to Term 0 0
Total loans receivable 58,158 78,043
Risk rating 1 to 5 | C&I/Agricultural operating: | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 2,328 17,599
Year two 16,406 13,049
Year three 10,000 28,343
Year four 27,537 13,629
Year five 12,466 8,787
Prior 11,790 4,197
Revolving 20,931 24,809
Revolving to Term 0 0
Total loans receivable 101,458 110,413
Risk rating 1 to 5 | C&I/Agricultural operating: | Agricultural operating    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 2,202 3,373
Year two 2,122 3,062
Year three 2,758 3,144
Year four 2,313 563
Year five 520 198
Prior 1,986 1,884
Revolving 16,188 17,609
Revolving to Term 0 0
Total loans receivable 28,089 29,833
Risk rating 1 to 5 | Residential mortgage: | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 1,026 13,400
Year two 12,928 28,598
Year three 27,581 30,386
Year four 29,891 7,369
Year five 7,233 2,141
Prior 29,719 30,004
Revolving 17,089 17,349
Revolving to Term 0 0
Total loans receivable 125,467 129,247
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 2,443 2,839
Revolving to Term 0 0
Total loans receivable 2,443 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 3,400 3,944
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 3,400 3,944
Risk rating 1 to 5 | Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 470 1,519
Year two 1,294 1,229
Year three 1,065 811
Year four 617 385
Year five 305 341
Prior 465 214
Revolving 460 511
Revolving to Term 0 0
Total loans receivable 4,676 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 2,844 138
Year five 40 0
Prior 3,535 0
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 7,720 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 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 250 0
Year two 817 0
Year three 1,545 3,062
Year four 2,963 13
Year five 73 0
Prior 169 0
Revolving 792 292
Revolving to Term 0 626
Total loans receivable 6,609 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 48 0
Year four 0 37
Year five 35 240
Prior 241 0
Revolving 191 65
Revolving to Term 0 0
Total loans receivable 515 391
Risk rating 7 | Commercial/Agricultural Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 172 0
Year three 697 553
Year four 496 2,445
Year five 2,114 214
Prior 4,523 4,448
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 8,002 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 378 5,102
Year five 4,978 0
Prior 378 441
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 5,935 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 436 74
Year four 33 401
Year five 401 0
Prior 1 0
Revolving 541 154
Revolving to Term 0 0
Total loans receivable 1,412 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 473 320
Year five 252 0
Prior 0 0
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 725 793
Risk rating 7 | Residential mortgage: | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 0 0
Year two 7 0
Year three 0 130
Year four 128 0
Year five 0 0
Prior 2,931 2,507
Revolving 100 8
Revolving to Term 0 0
Total loans receivable 3,166 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 34 26
Revolving 0 0
Revolving to Term 0 0
Total loans receivable 34 26
Risk rating 7 | Consumer installment: | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Year one 1 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 $ 3 $ 2