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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2021 | Sep. 30, 2025 USD ($) | Sep. 30, 2024 | Sep. 30, 2025 USD ($) reporting_unit branch segment | Sep. 30, 2024 | Dec. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total number of service offices | branch |  |  |  | 21 |  |
Accrued interest receivable on available-for-sale and held-to-maturity securities |  | $ 904 |  | $ 904 |  | $ 920
Liquidating investment period (in years) |  |  |  | 10 years |  |
Other investments |  | 12,370 |  | $ 12,370 |  | 12,500
Loans charged off past due more than days |  |  |  | 180 days |  |
Closed end loan charged off past due more than days |  |  |  | 120 days |  |
Interest receivable |  | 4,775 |  | $ 4,775 |  | 4,467
Number of operating segments | segment |  |  |  | 1 |  |
Number of reporting units | reporting_unit |  |  |  | 1 |  |
Carrying amount of investment |  | $ 3,700 |  | $ 3,700 |  |
Effective income tax rate |  | 18.80% | 21.50% | 19.20% | 21.60% |
Loan commitments outstanding |  | $ 4,570 |  | $ 4,570 |  |
2018 Equity Incentive Plan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Vesting period of shares (in years) |  |  |  | 3 years |  |
Time Based Restricted Stock | 2018 Equity Incentive Plan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Vesting period of shares (in years) |  |  |  | 3 years |  |
Performance-based Restricted Stock | 2018 Equity Incentive Plan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Vesting period of shares (in years) | 3 years |  |  | 3 years |  |
Federal Home Loan Bank Short Term Debt |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Advance from FHLB |  | 0 |  | $ 0 |  | 0
Federal Home Loan Bank Long Term Debt |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Advance from FHLB |  | $ 0 |  | $ 0 |  | 5,000
Minimum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Useful life of intangible assets |  | 72 months |  | 72 months |  |
Minimum | Buildings and Components |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Useful life of property and equipment (in years) |  | 10 years |  | 10 years |  |
Minimum | Furniture Fixtures and Equipment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Useful life of property and equipment (in years) |  | 3 years |  | 3 years |  |
Maximum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Useful life of intangible assets |  | 111 months |  | 111 months |  |
Maximum | Buildings and Components |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Useful life of property and equipment (in years) |  | 40 years |  | 40 years |  |
Maximum | Furniture Fixtures and Equipment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Useful life of property and equipment (in years) |  | 10 years |  | 10 years |  |
FHLB |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Other investments |  | $ 3,727 |  | $ 3,727 |  | 3,865
Federal Reserve Bank |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Other investments |  | 5,725 |  | 5,725 |  | 5,717
Bankers Bank Stock |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Other investments |  | $ 2,918 |  | $ 2,918 |  | $ 2,918
Commercial Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest income discontinued over delinquent days |  |  |  | 90 days |  |
Closed Ended Consumer Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest income discontinued over delinquent days |  |  |  | 120 days |  |
Real Estate and Open Ended Consumer Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest income discontinued over delinquent days |  |  |  | 180 days |  |

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