Investment Securities-Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021
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	$ 3,335
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	5,441
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	35,473
Available-for-sale Securities, Amortized Cost Basis	87,095	$ 89,682
Debt Securities, Available-for-sale, Amortized Cost	87,095
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	3,361
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	5,410
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	35,144
Available-for-sale Securities	86,039	86,507
Available-for-sale	$ 86,039	86,507
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Rate	3.18%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate	1.47%
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Rate	1.98%
Available-for-sale Securities, Debt Maturities, Weighted Average Rate	1.69%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount
Held-to-maturity	$ 5,833	7,807
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Held-to-maturity, Fair Value	$ 6,109	$ 8,140