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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Financing Receivable, Past Due [Line Items] |  |
Loans receivable from related parties | $ 1,800,000 | $ 1,800,000
Loans excludes allowance for off-balance sheet | 215,000 | 215,000
Federal Home Loan Mortgage Corp |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable from related parties | $ 901,000 | $ 940,000

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