Investment Securities - Additional Information (Details) - USD ($)	9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Investment securities, Amortized cost	$ 62,641,000		$ 66,184,000
Available for sale, Fair Value	57,034,000		60,356,000
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	52,100,000		43,600,000
Available for sale, Fair Value	$ 47,300,000		$ 39,900,000