Investment Securities-Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	$ 2,185
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	2,670
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	25,607
Debt Securities, Available-for-sale, Amortized Cost	62,958	$ 66,058
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	2,173
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	2,174
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	18,822
Available-for-sale	$ 47,644	53,843
Available-for-Sale Securities, Debt Maturities, Weighted Average Yield
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Rate	6.05%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate	2.67%
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Rate	3.47%
Available-for-sale Securities, Debt Maturities, Weighted Average Rate	2.60%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount
Held-to-maturity	$ 2,162	2,318
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Held-to-maturity, Fair Value	$ 2,005	$ 2,221