Investment Securities - Additional Information (Details) - USD ($)	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Investment securities, Amortized cost	$ 65,957,000	$ 63,979,000
Available for sale, Fair Value	62,534,000	59,369,000
Sales of available-for-sale securities	0	0
Public, Consumer, and Commercial Deposits
Debt Securities, Available-for-Sale [Line Items]
Investment securities, Amortized cost	22,500,000	44,200,000
Available for sale, Fair Value	$ 21,200,000	$ 41,000,000

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details