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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 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 receivable | $ 1,323,010 |  | $ 1,368,981 |  |  |
Less: Allowance for credit losses | (22,182) | $ (21,347) | (20,549) | $ (21,000) | $ (21,178) | $ (22,908)
Loans receivable, net | $ 1,300,828 |  | $ 1,348,432 |  |  |
% of Total | 100.00% |  | 100.00% |  |  |
Commercial/Agricultural Real Estate |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | $ (17,552) | (17,164) | $ (16,516) | (16,923) | (17,033) | (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 receivable | $ 682,440 |  | $ 707,009 |  |  |
% of Total | 51.60% |  | 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 receivable | $ 64,001 |  | $ 72,738 |  |  |
% of Total | 4.80% |  | 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 receivable | $ 237,068 |  | $ 220,706 |  |  |
% of Total | 17.90% |  | 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 receivable | $ 74,354 |  | $ 78,146 |  |  |
% of Total | 5.60% |  | 5.70% |  |  |
C&I/Agricultural operating: |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | $ (2,144) | (1,658) | $ (1,330) | (1,351) | (1,117) | (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 receivable | $ 101,535 |  | $ 115,535 |  |  |
% of Total | 7.70% |  | 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 receivable | $ 30,078 |  | $ 31,017 |  |  |
% of Total | 2.30% |  | 2.30% |  |  |
Residential mortgage: |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | $ (2,323) | (2,347) | $ (2,489) | (2,494) | (2,784) | (2,744)
Residential mortgage: | Residential mortgage |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Total loans receivable | $ 124,834 |  | $ 131,892 |  |  |
% of Total | 9.40% |  | 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 receivable | $ 1,979 |  | $ 2,956 |  |  |
% of Total | 0.20% |  | 0.20% |  |  |
Consumer installment: |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | $ (163) | $ (178) | $ (214) | $ (232) | $ (244) | $ (275)
Consumer installment: | Originated indirect paper |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Total loans receivable | $ 2,566 |  | $ 3,970 |  |  |
% of Total | 0.20% |  | 0.30% |  |  |
Consumer installment: | Other consumer |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Total loans receivable | $ 4,155 |  | $ 5,012 |  |  |
% of Total | 0.30% |  | 0.40% |  |  |

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