Investment Securities - Additional Information (Details) - USD ($)	9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Investment securities, Amortized cost	$ 62,671,000		$ 63,814,000
Available for sale, Fair Value	57,316,000		57,842,000
Sales of available-for-sale securities	0	$ 0
Public, Consumer, and Commercial Deposits
Debt Securities, Available-for-Sale [Line Items]
Investment securities, Amortized cost	42,089,000		34,149,000
Available for sale, Fair Value	$ 38,843,000		$ 31,935,000