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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 | Jun. 30, 2024 USD ($) reporting_unit segment branch | Jun. 30, 2023 | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Total number of service offices | branch |  |  |  |  | 22 |  |  |
Liquidating investment period (in years) |  |  |  |  | 10 years |  |  |
Other investments |  | $ 13,878 |  |  | $ 13,878 |  |  | $ 15,725
Loans charged off past due more than days |  |  |  |  | 180 days |  |  |
Closed end loan charged off past due more than days |  |  |  |  | 120 days |  |  |
Number of operating segments | segment |  |  |  |  | 1 |  |  |
Number of reporting units | reporting_unit |  |  |  |  | 1 |  |  |
Effective income tax rate |  | 22.10% |  | 25.50% | 21.60% | 25.50% |  |
Deferred tax asset valuation allowance |  |  | $ 1,828 |  |  |  | $ 1,828 |
Loan commitments outstanding |  | $ 4,174 |  |  | $ 4,174 |  |  |
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 |  | 16,500 |  |  | $ 16,500 |  |  | 44,000
Federal Home Loan Bank Long Term Debt |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Advance from FHLB |  | $ 15,000 |  |  | 15,000 |  |  | 35,530
Other Assets |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying amount of investment |  |  |  |  | $ 2,608 |  |  |
Minimum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Useful life of intangible assets |  | 84 months |  |  | 84 months |  |  |
Minimum | Buildings and Components |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Useful life of property and equipment |  | 10 years |  |  | 10 years |  |  |
Minimum | Furniture Fixtures and Equipment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Useful life of property and equipment |  | 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 |  | 40 years |  |  | 40 years |  |  |
Maximum | Furniture Fixtures and Equipment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Useful life of property and equipment |  | 10 years |  |  | 10 years |  |  |
FHLB |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Other investments |  | $ 5,447 |  |  | $ 5,447 |  |  | 7,302
Federal Reserve Bank |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Other investments |  | 5,707 |  |  | 5,707 |  |  | 5,699
Bankers Bank Stock |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Other investments |  | $ 2,724 |  |  | $ 2,724 |  |  | $ 2,724
Commercial Loan |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Interest income discontinued over delinquent days |  |  |  |  | 90 days |  |  |
Closed End 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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