Off-Balance Sheet Financial Instruments and Guarantees (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Loss Contingencies [Line Items]
Financial instrument commitments	$ 127,631	$ 122,078
Commitments to grant loans [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	55,036	40,322
Unfunded commitments under lines of credit [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	68,530	77,573
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	$ 4,065	$ 4,183