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LOANS AND ALLOWANCE FOR CREDIT LOSSES FOR LOANS - Additional information (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) loan | Sep. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) loan | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Deferred loan fees | $ 4,500,000 | $ 4,500,000 |  | $ 4,700,000 |  |  |
Discount On Loans Receivable | 1,200,000 | 1,200,000 |  | 1,300,000 |  |  |
Receivable with Imputed Interest, Premium | 1,800,000 | 1,800,000 |  | 1,900,000 |  |  |
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss | 1,045,511,000 | $ 1,045,511,000 |  | $ 1,008,649,000 |  |  |
Percentage Of Loans And Extensions Of Credit Outstanding |  | 15.00% |  |  |  |  |
Number of loans to one borrower over regulatory limit | loan |  | 0 |  | 0 |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 0 |  |  |  |  |  |
Financing receivable, excluding accrued interest, modified, subsequent default |  | $ 0 |  |  |  |  |
Allowance for credit losses (in dollars) | 15,466,000 | 15,466,000 | $ 15,346,000 | $ 15,364,000 | $ 15,364,000 | $ 15,343,000 | $ 15,309,000
Non-accrual loans with no ACL | 116,000 | 116,000 |  |  |  |  |
Non-accrual loans with ACL | 33,000 | 33,000 |  |  |  |  |
Non-accruals, Allowance | 1,000 | 1,000 |  |  |  |  |
Interest income foregone on non-accrual loans |  | 4,000 | 5,000 | 10,000 |  |  |
Total loans | 1,060,977,000 | 1,060,977,000 |  | 1,024,013,000 |  |  |
30-89 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans | 6,844,000 | 6,844,000 |  | 1,779,000 |  |  |
Adjustment | ASU 2016-13 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses (in dollars) |  |  |  |  |  |  | 42,000
Fully Guaranteed SBA Or USDA Loans | 30-89 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans | 2,100,000 | 2,100,000 |  | 1,800,000 |  |  |
Assets pledged as collateral | FHLB and FRB Borrowing Arrangements |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss | 768,200,000 | 768,200,000 |  |  |  |  |
Assets pledged as collateral | Financing receivable | Commercial Business |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss | 48,000 | 48,000 |  |  |  |  |
Assets pledged as collateral | Financing receivable | Commercial Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss | 68,000 | 68,000 |  |  |  |  |
Commercial and Industrial | Commercial Business |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans | 236,895,000 | 236,895,000 |  | 229,404,000 |  |  |
Commercial and Industrial | Commercial Business | 30-89 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans | 3,063,000 | 3,063,000 |  | 1,778,000 |  |  |
Commercial Real Estate Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans | 947,832,000 | 947,832,000 |  | 925,907,000 |  |  |
Commercial Real Estate Portfolio Segment | Commercial Business |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses (in dollars) | 5,118,000 | 5,118,000 | 5,339,000 | 5,280,000 | 5,141,000 | 5,215,000 | 3,123,000
Total loans | 236,895,000 | 236,895,000 |  | 229,404,000 |  |  |
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) | 7,137,000 | 7,137,000 | 7,138,000 | 7,391,000 | 7,303,000 | 7,205,000 | 8,894,000
Total loans | 573,455,000 | 573,455,000 |  | 583,501,000 |  |  |
Commercial Real Estate Portfolio Segment | Commercial Real Estate | 30-89 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans | 3,745,000 | 3,745,000 |  |  |  |  |
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) | 1,793,000 | 1,793,000 | $ 1,604,000 | 1,584,000 | $ 1,675,000 | $ 1,677,000 | 1,127,000
Total loans | 113,145,000 | 113,145,000 |  | 98,106,000 |  |  |
Consumer | 30-89 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans | 36,000 | 36,000 |  | 1,000 |  |  |
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 | $ 96,911,000 | $ 96,911,000 |  | $ 96,366,000 |  |  |

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