Off-Balance Sheet Financial Instruments and Gurantees (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Loss Contingencies [Line Items]
Financial instrument commitments	$ 122,078	$ 115,846
Commitments to grant loans [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	40,322	46,792
Unfunded commitments under lines of credit [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	77,573	63,135
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Financial instrument commitments	$ 4,183	$ 5,919