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Nonaccrual loans (Details) - Non-performing - USD ($) $ in Thousands | Mar. 31, 2024 | Mar. 31, 2023
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance | $ 144 |
Financing Receivable, Nonaccrual, With Allowance | 11,631 |
Financing Receivable, Excluding Accrued Interest, Nonaccrual | 11,775 | $ 12,261
One-to-four family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance | 0 |
Financing Receivable, Nonaccrual, With Allowance | 3,554 |
Financing Receivable, Excluding Accrued Interest, Nonaccrual | 3,554 | 4,001
Multifamily |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance | 0 |
Financing Receivable, Nonaccrual, With Allowance | 2,238 |
Financing Receivable, Excluding Accrued Interest, Nonaccrual | 2,238 | 71
Commercial Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance | 0 |
Financing Receivable, Nonaccrual, With Allowance | 4,522 |
Financing Receivable, Excluding Accrued Interest, Nonaccrual | 4,522 | 7,190
Business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance | 100 |
Financing Receivable, Nonaccrual, With Allowance | 1,317 |
Financing Receivable, Excluding Accrued Interest, Nonaccrual | 1,417 | 998
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance | 44 |
Financing Receivable, Nonaccrual, With Allowance | 0 |
Financing Receivable, Excluding Accrued Interest, Nonaccrual | $ 44 | $ 1

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- Definition Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
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