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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional information (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) loan | Sep. 30, 2023 USD ($) loan | Sep. 30, 2022 USD ($) | Mar. 31, 2023 USD ($) loan | Jun. 30, 2023 USD ($) | Apr. 01, 2023 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Deferred loan fees | $ 4,400,000 | $ 4,400,000 |  | $ 4,400,000 |  |
Discount On Loans Receivable | 1,300,000 | 1,300,000 |  | 1,400,000 |  |
Premiums On Loans Receivable. | 2,000,000.0 | 2,000,000.0 |  | $ 2,100,000 |  |
Loans Pledged as Collateral | 1,000,279,000 | $ 1,000,279,000 |  |  |  |
Percentage Of Loans And Extensions Of Credit Outstanding |  | 15.00% |  |  |  |
Number of loans to one borrower over regulatory limit | loan |  | 0 |  | 0 |  |
Allowance for credit losses (in dollars) | 15,346,000 | $ 15,346,000 |  | $ 15,309,000 | $ 15,343,000 |
Non-accrual loans with no ACL | 159,000 | 159,000 |  |  |  |
Non-accrual loans with ACL | 39,000 | 39,000 |  |  |  |
Non-accruals, Allowance | 1,000 | 1,000 |  |  |  |
Interest income foregone on non-accrual loans |  | 5,000 | $ 7,000 | 14,000 |  |
Total loans | $ 1,015,625,000 | $ 1,015,625,000 |  |  |  |
Number of loan modifications approved | loan | 0 | 0 |  |  |  |
Percentage of delinquent loan amount |  | 75.00% |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  |  | 0 |  |  |
30 To 89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 1,234,000 | $ 1,234,000 |  |  |  |
ASU 2016-13 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number Of impaired loans on nonaccrual status | loan |  |  |  |  |  | 2
Adjustment | ASU 2016-13 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses (in dollars) |  |  |  | 42,000 |  | $ 42,000
Fully Guaranteed SBA Or USDA Loans | 30 To 89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 130,000 | 130,000 |  |  |  |
Asset Pledged as Collateral | FHLB and FRB Borrowing Arrangements |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans Pledged as Collateral | 578,100,000 | 578,100,000 |  |  |  |
Asset Pledged as Collateral | Financing receivable | Commercial Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans Pledged as Collateral | 69,000 | 69,000 |  |  |  |
Asset Pledged as Collateral | Financing receivable | Commercial Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans Pledged as Collateral | 90,000 | 90,000 |  |  |  |
Commercial Real Estate Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 917,432,000 | 917,432,000 |  |  |  |
Commercial Real Estate Portfolio Segment | Commercial Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses (in dollars) | 5,339,000 | 5,339,000 |  | 3,123,000 | 5,215,000 |
Total loans | 242,041,000 | 242,041,000 |  |  |  |
Commercial Real Estate Portfolio Segment | Commercial Business | 30 To 89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 966,000 | 966,000 |  |  |  |
Commercial Real Estate Portfolio Segment | Commercial Business | Adjustment | ASU 2016-13 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses (in dollars) |  |  |  | 1,884,000 |  |
Commercial Real Estate Portfolio Segment | Commercial Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses (in dollars) | 7,138,000 | 7,138,000 |  | 8,894,000 | 7,205,000 |
Total loans | 561,377,000 | 561,377,000 |  |  |  |
Commercial Real Estate Portfolio Segment | Commercial Real Estate | 30 To 89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 268,000 | 268,000 |  |  |  |
Commercial Real Estate Portfolio Segment | Commercial Real Estate | Adjustment | ASU 2016-13 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses (in dollars) |  |  |  | (1,494,000) |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses (in dollars) | 1,604,000 | 1,604,000 |  | 1,127,000 | $ 1,677,000 |
Total loans | 98,193,000 | 98,193,000 |  |  |  |
Consumer | Adjustment | ASU 2016-13 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses (in dollars) |  |  |  | $ 483,000 |  |
Consumer | Real estate one-to-four family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 96,351,000 | $ 96,351,000 |  |  |  |

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