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Off-Balance Sheet Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Financial instrument commitments $ 104,754 $ 121,421
Commitments to grant loans [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 44,246 45,246
Unfunded commitments under lines of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 56,840 71,906
Standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments $ 3,668 $ 4,269