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Allowance for Loan Losses - Narrative (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
loan_class
Dec. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
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) 0.46% 0.39%        
Allowance for loan and lease losses, period increase (decrease) $ 965          
Allowance for loan losses $ 11,012 $ 10,138 $ 10,611 $ 10,298 $ 10,198 $ 9,916
Allowance for loan losses as a percent of total loans 0.98% 0.95%   1.00%    
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 30.40%          
Constructions loan portfolio maximum to company capital 100.00%          
Construction and non owner occupied commercial real estate 107.60%          
Maximum loan portfolio to company capital 300.00%          
Outstanding loans and commitments subject by independent consulting firm 50.00%          
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 535 $ 559 $ 529 $ 618 $ 635 $ 566
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 $ 852 $ 1,258   $ 1,338    
Total reserve allowance accounted for by loan loss allowances (percent) 7.70% 12.40%