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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Total Loans | $ 1,428,588 |  | $ 1,460,792 |  |  |
Allowance for credit losses | (21,178) | $ (22,436) | (22,908) | $ (23,164) | $ (22,679) | $ (17,939)
Loans receivable, net | $ 1,407,410 |  | $ 1,437,884 |  |  |
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 | $ (17,033) | (18,255) | $ (18,784) | (18,933) | (18,496) | (14,085)
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 | $ 727,170 |  | $ 748,447 |  |  |
Total, percent | 50.90% |  | 51.20% |  |  |
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 | $ 77,782 |  | $ 83,157 |  |  |
Total, percent | 5.50% |  | 5.70% |  |  |
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 | $ 234,624 |  | $ 228,004 |  |  |
Total, percent | 16.40% |  | 15.60% |  |  |
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 | $ 87,379 |  | $ 110,218 |  |  |
Total, percent | 6.10% |  | 7.50% |  |  |
C&I/Agricultural operating: |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ (1,117) | (1,166) | $ (1,105) | (1,458) | (1,848) | (2,318)
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 | $ 127,308 |  | $ 121,190 |  |  |
Total, percent | 8.90% |  | 8.30% |  |  |
C&I/Agricultural operating: | Agricultural operating |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Total Loans | $ 27,422 |  | $ 25,695 |  |  |
Total, percent | 1.90% |  | 1.80% |  |  |
Residential mortgage: |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ (2,784) | (2,765) | $ (2,744) | (2,452) | (2,000) | (599)
Residential mortgage: | Residential mortgage |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Total Loans | $ 133,018 |  | $ 128,479 |  |  |
Total, percent | 9.30% |  | 8.80% |  |  |
Residential mortgage: | Purchased HELOC loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Total Loans | $ 2,915 |  | $ 2,880 |  |  |
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 | $ (244) | $ (250) | $ (275) | $ (321) | $ (335) | $ (129)
Consumer installment: | Originated indirect paper |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Total Loans | $ 5,110 |  | $ 6,535 |  |  |
Total, percent | 0.40% |  | 0.40% |  |  |
Consumer installment: | Other consumer |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Total Loans | $ 5,860 |  | $ 6,187 |  |  |
Total, percent | 0.40% |  | 0.40% |  |  |

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