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Off-Balance Sheet Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]    
Financial instrument commitments $ 121,421 $ 113,117
Commitments to grant loans [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 45,246 44,970
Unfunded commitments under lines of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 71,906 62,228
Standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments $ 4,269 $ 5,919