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Investment Securities - Additional Information (Details) - USD ($)	6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Investment securities, Amortized cost	$ 63,201,000		$ 63,979,000
Available for sale, Fair Value	59,670,000		59,369,000
Sales of available-for-sale securities	0	$ 0
Credit losses on debt securities	0
Provision for credit losses on securities	0
Public, Consumer, and Commercial Deposits
Debt Securities, Available-for-Sale [Line Items]
Investment securities, Amortized cost	43,500,000		44,200,000
Available for sale, Fair Value	$ 40,900,000		$ 41,000,000

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