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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Probable loan loss experience on unfunded obligations [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Estimate of possible loss $ 276 $ 326
Commitments to extend credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit 321,624 350,141
Undisbursed lines of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit $ 318,744 347,001
Undisbursed lines of credit | Minimum    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit, term of agreement 1 month  
Undisbursed lines of credit | Maximum    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit, term of agreement 12 months  
Undisbursed portions of construction loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit $ 80,336 88,658
Standby letters of credit and financial guarantees    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit $ 2,880 $ 3,140
Standby letters of credit and financial guarantees | Maximum    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit, term of agreement 1 year