Investment Securities-Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Mar. 31, 2022
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 101
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	6,127
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	26,726
Debt Securities, Available-for-sale, Amortized Cost	67,181	$ 74,258
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	100
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	5,655
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	20,340
Available-for-sale	$ 53,443	67,596
Available-for-Sale Securities, Debt Maturities, Weighted Average Yield
Available-for-sale, Securities, Debt Maturities, within One Year, Weighted Average Rate	(0.85%)
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Rate	0.00%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate	4.08%
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Rate	3.10%
Available-for-sale Securities, Debt Maturities, Weighted Average Rate	2.26%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount
Held-to-maturity	$ 2,406	5,254
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Held-to-maturity, Fair Value	$ 2,282	$ 5,276