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Allowance for Loan Losses - Narrative (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
loan_class
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of classes in the loan portfolio (loan class) | loan_class 8          
Allowance for loan and lease losses (percent) 0.43% 0.45%        
Allowance for loan and lease losses, period increase (decrease) $ 162          
Allowance for loan losses $ 11,682 $ 10,729 $ 11,472 $ 11,012 $ 10,611 $ 10,138
Allowance for loan losses as a percent of total loans 0.94% 0.92%   0.98%    
Number of classes in the commercial loan portfolio (loan class) | loan_class 3          
Residential loans typical loan to value range, maximum (percent) 80.00%          
Construction loans accrual to company capital 24.40%          
Constructions loan portfolio maximum to company capital 100.00%          
Construction and non owner occupied commercial real estate 123.10%          
Maximum loan portfolio to company capital 300.00%          
Outstanding loans and commitments subject by independent consulting firm 60.00%          
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 740 $ 545 $ 575 $ 535 $ 529 $ 559
Delinquent period before consumer loans charged off (days) 120 days          
Residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Delinquent period before residential loans placed on non accrual status (days) 90 days          
Delinquent period for loans charged off (days) 180 days          
Delinquency period for loans charged off after receipt of notification from bankruptcy court (days) 60 days          
Unallocated Reserves            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 1,678 $ 642   $ 852    
Total reserve allowance accounted for by loan loss allowances (percent) 14.40% 6.00%