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Loans Receivable and ACL (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | $ 611,102 |  | $ 597,896 |  |  |  |
Loans and Leases Receivable, Allowance |  |  | $ (5,858) | (5,229) |  | $ (5,509) | $ (5,604) | $ (5,624)
Loans and Leases Receivable, Net Amount |  |  |  | $ 592,667 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 611,102 |  |  |  |  |  |
Allowance for Credit Loss, Excluding Accrued Interest |  | 6,007 |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss |  | $ 605,095 |  |  |  |  |  |
Percentage of Loan Type |  | 100.00% |  | 100.00% |  |  |  |
One-to-four family |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | $ 85,081 |  | $ 65,808 |  |  |  |
Loans and Leases Receivable, Allowance |  |  | (2,063) | $ (716) |  | (704) | (649) | (731)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 85,081 |  |  |  |  |  |
Allowance for Credit Loss, Excluding Accrued Interest |  | $ 2,264 |  |  |  |  |  |
Percentage of Loan Type |  | 13.90% |  | 11.00% |  |  |  |
Multifamily |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | $ 179,039 |  | $ 179,117 |  |  |  |
Loans and Leases Receivable, Allowance |  |  | (713) | $ (1,109) |  | (1,055) | (1,053) | (1,114)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 179,039 |  |  |  |  |  |
Allowance for Credit Loss, Excluding Accrued Interest |  | $ 721 |  |  |  |  |  |
Percentage of Loan Type |  | 29.30% |  | 30.00% |  |  |  |
Commercial real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | $ 171,112 |  | $ 178,424 |  |  |  |
Loans and Leases Receivable, Allowance |  |  | (1,264) | $ (1,814) |  | (1,608) | (1,108) | (1,157)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 171,112 |  |  |  |  |  |
Allowance for Credit Loss, Excluding Accrued Interest |  | $ 1,212 |  |  |  |  |  |
Percentage of Loan Type |  | 28.00% |  | 29.80% |  |  |  |
Business |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | $ 162,460 |  | $ 166,908 | [1] |  |  |
Loans and Leases Receivable, Allowance |  |  | (1,404) | $ (1,139) |  | (1,814) | (2,321) | (2,497)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | [1] | 162,460 |  |  |  |  |  |
Allowance for Credit Loss, Excluding Accrued Interest |  | $ 1,393 |  |  |  |  |  |
Percentage of Loan Type | [1] | 26.60% |  | 27.90% |  |  |  |
Consumer |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | $ 12,919 |  | $ 7,639 | [2] |  |  |
Loans and Leases Receivable, Allowance |  |  | $ (414) | $ (449) |  | $ (82) | $ (113) | $ (123)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | [2] | 12,919 |  |  |  |  |  |
Allowance for Credit Loss, Excluding Accrued Interest |  | $ 417 |  |  |  |  |  |
Percentage of Loan Type | [2] | 2.10% |  | 1.30% |  |  |  |
[1] | (1) Includes PPP loans and business overdrafts
[2] | 2) Includes personal loans and consumer overdrafts

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