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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 1,352,728 | $ 1,368,981 |  |
Allowance for credit losses | (20,205) | (20,549) | $ (22,436) | $ (22,908)
Loans receivable, net | $ 1,332,523 | $ 1,348,432 |  |
Total, percent | 100.00% | 100.00% |  |
Commercial/Agricultural Real Estate |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Allowance for credit losses | $ (16,244) | $ (16,516) | (18,255) | (18,784)
Commercial/Agricultural Real Estate | Commercial real estate |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 707,994 | $ 707,009 |  |
Total, percent | 52.30% | 51.70% |  |
Commercial/Agricultural Real Estate | Agricultural real estate |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 70,726 | $ 72,738 |  |
Total, percent | 5.20% | 5.30% |  |
Commercial/Agricultural Real Estate | Multi-family real estate |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 237,736 | $ 220,706 |  |
Total, percent | 17.60% | 16.10% |  |
Commercial/Agricultural Real Estate | Construction and land development |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 58,158 | $ 78,146 |  |
Total, percent | 4.30% | 5.70% |  |
C&I/Agricultural operating: |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Allowance for credit losses | $ (1,430) | $ (1,330) | (1,166) | (1,105)
C&I/Agricultural operating: | Commercial and industrial |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 109,479 | $ 115,535 |  |
Total, percent | 8.10% | 8.40% |  |
C&I/Agricultural operating: | Agricultural operating |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 29,329 | $ 31,017 |  |
Total, percent | 2.20% | 2.30% |  |
Residential mortgage: |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Allowance for credit losses | $ (2,338) | $ (2,489) | (2,765) | (2,744)
Residential mortgage: | Residential mortgage |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 128,633 | $ 131,892 |  |
Total, percent | 9.50% | 9.60% |  |
Residential mortgage: | Purchased HELOC loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 2,560 | $ 2,956 |  |
Total, percent | 0.20% | 0.20% |  |
Consumer installment: |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Allowance for credit losses | $ (193) | $ (214) | $ (250) | $ (275)
Consumer installment: | Originated indirect paper |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 3,434 | $ 3,970 |  |
Total, percent | 0.30% | 0.30% |  |
Consumer installment: | Other consumer |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Total Loans | $ 4,679 | $ 5,012 |  |
Total, percent | 0.30% | 0.40% |  |

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