Loans Receivable and ACL Text Tags (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Loans and Leases Receivable Disclosure [Abstract]
Unamortized premiums, deferred costs and fees, net	$ (3,000)		$ (2,800)
Number of Loans Originated Under the Paycheck Protection Program				420
Loans Originated Under the Paycheck Protection Program, Amount				$ 57,100
Financing Receivable, Nonaccrual, Interest Income	0
Other Real Estate Owned	$ 60		$ 60
Number of Real Estate Properties	1		1
Financing Receivable, Held-for-Sale	$ 0		$ 0
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0		$ 0
Financing Receivable, Modified in Period, Amount		$ 1,000
Number of Modified Loan Subsequently Defaulted	0	0
Loans and Leases Receivable, Related Parties	$ 0
Financing Receivable, Modified [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	2
Financing Receivable, Modified, Accumulated	$ 7,400
Nonperforming
Financing Receivable, Modified [Line Items]
Financing Receivable, Modified, Accumulated	$ 1,600
Performing
Financing Receivable, Modified [Line Items]
Financing Receivable, Modifications, Number of Contracts	4
Financing Receivable, Modified, Accumulated	$ 5,800
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Purchase	6,700
Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Purchase	$ 300