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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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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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