Investment Securities-Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
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	$ 3,336
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	5,655
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	36,126
Available-for-sale Securities, Amortized Cost Basis	89,682	$ 64,897
Debt Securities, Available-for-sale, Amortized Cost	89,682
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	3,364
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	5,612
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	34,110
Available-for-sale Securities	86,507	65,829
Available-for-sale	$ 86,507	65,829
Debt Securities, Available-for-sale, Maturity, Weighted Average Yield [Abstract]
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Yield	3.18%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield	1.37%
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Yield	1.93%
Available-for-sale Securities, Debt Maturities, Weighted Average Yield	1.71%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount
Held-to-maturity	$ 7,807	10,151
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Debt Securities, Held-to-maturity, Fair Value	$ 8,140	$ 10,564