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Off-Balance Sheet Financial Instruments and Guarantees (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Loss Contingencies [Line Items]    
Financial instrument commitments $ 143,983 $ 126,100
Commitments to grant loans [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 61,826 49,936
Unfunded commitments under lines of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 78,092 71,859
Standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments $ 4,065 $ 4,305