Investment Securities-Schedule of Unrealized Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 575	$ 3,217
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	18,087	60,110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,445	113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	51,531	18,631
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	2,020	3,330
Debt Securities, Available-for-sale, Unrealized Loss Position	69,618	78,741
Mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	164	1,271
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	6,030	39,020
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,159	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	28,824	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1,323	1,271
Debt Securities, Available-for-sale, Unrealized Loss Position	34,854	39,020
US Government Agency Securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	60	113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	15,071	18,631
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	60	113
Debt Securities, Available-for-sale, Unrealized Loss Position	15,071	18,631
Corporate Bonds
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	793
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	4,481
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	90	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	5,182	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	90	793
Debt Securities, Available-for-sale, Unrealized Loss Position	5,182	4,481
Municipal Securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	411	1,153
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	12,057	16,609
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	136
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,454
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	547	1,153
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 14,511	$ 16,609