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LOANS AND ALLOWANCE FOR CREDIT LOSSES FOR LOANS - Additional information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) loan | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) loan | Sep. 30, 2023 USD ($) | Apr. 01, 2023 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Deferred loan fees | $ 4,700,000 | $ 4,700,000 |  | $ 4,400,000 |  |
Discount On Loans Receivable | 1,300,000 | 1,300,000 |  | 1,400,000 |  |
Premiums On Loans Receivable. | 1,900,000 | 1,900,000 |  | $ 2,100,000 |  |
Loans Pledged as Collateral | 1,002,838,000 | $ 1,002,838,000 |  |  |  |
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) | 15,361,000 | $ 15,361,000 |  | $ 15,309,000 | $ 15,346,000 |
Non-accrual loans with no ACL | 148,000 | 148,000 |  |  |  |
Non-accrual loans with ACL | 38,000 | 38,000 |  |  |  |
Non-accruals, Allowance | 1,000 | 1,000 |  |  |  |
Interest income foregone on non-accrual loans |  | 8,000 | $ 10,000 | 14,000 |  |
Total loans | $ 1,018,199,000 | $ 1,018,199,000 |  |  |  |
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 | $ 4,730,000 | $ 4,730,000 |  |  |  |
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 | 1,400,000 | 1,400,000 |  |  |  |
Asset Pledged as Collateral | FHLB and FRB Borrowing Arrangements |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans Pledged as Collateral | 617,900,000 | 617,900,000 |  |  |  |
Asset Pledged as Collateral | Financing receivable | Commercial Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans Pledged as Collateral | 63,000 | 63,000 |  |  |  |
Asset Pledged as Collateral | Financing receivable | Commercial Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans Pledged as Collateral | 85,000 | 85,000 |  |  |  |
Commercial Real Estate Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 920,198,000 | 920,198,000 |  |  |  |
Commercial Real Estate Portfolio Segment | Commercial Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses (in dollars) | 5,265,000 | 5,265,000 |  | 3,123,000 | 5,339,000 |
Total loans | 229,249,000 | 229,249,000 |  |  |  |
Commercial Real Estate Portfolio Segment | Commercial Business | 30 To 89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 3,896,000 | 3,896,000 |  |  |  |
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) | 7,279,000 | 7,279,000 |  | 8,894,000 | 7,138,000 |
Total loans | 573,075,000 | 573,075,000 |  |  |  |
Commercial Real Estate Portfolio Segment | Commercial Real Estate | 30 To 89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 821,000 | 821,000 |  |  |  |
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) | 1,595,000 | 1,595,000 |  | 1,127,000 | $ 1,604,000 |
Total loans | 98,001,000 | 98,001,000 |  |  |  |
Consumer | 30 To 89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 13,000 | 13,000 |  |  |  |
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 | $ 96,266,000 | $ 96,266,000 |  |  |  |

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