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Off-Balance Sheet Financial Instruments (Schedule of Fair Value, Off-balance Sheet Risks) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Loss Contingencies [Line Items]    
Financial instrument commitments $ 115,846 $ 88,478
Commitments to grant loans [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 46,792 21,128
Unfunded commitments under lines of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 63,135 61,708
Standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments $ 5,919 $ 5,642