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Allowance for Loan Losses - Narrative (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
loan_class
Dec. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of classes in the loan portfolio | loan_class 8          
Allowance for loan and lease losses (as a percentage) 0.47% 0.45%        
Allowance for loan and lease losses, period increase (decrease) $ 226          
Allowance for loan losses $ 11,471 $ 11,232 $ 11,490 $ 11,472 $ 10,957 $ 10,729
Allowance for loan losses as a percent of total loans 0.92% 0.91%   0.94%    
Number of classes in the commercial loan portfolio | loan_class 3          
Number of classes in the residential loan portfolio | loan_class 2          
Residential loans typical loan to value range (as a percentage) 80.00%          
Construction loans accrual to company capital 25.20%          
Constructions loan portfolio maximum to company capital 100.00%          
Construction and non owner occupied commercial real estate 122.70%          
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 $ 649 $ 630 660 $ 575 581 545
Delinquent period before consumer loans charged off (days) 120 days          
Residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan-to-value ratio 0.80          
Amortization term of residential loans 30 years          
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          
Home equity line of credit            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 633 730 630 678 716 692
Loan-to-value ratio 0.80          
Loan maturities 300 months          
Unallocated Reserves            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 1,836 $ 1,216   1,425    
Total reserve allowance accounted for by loan loss allowances (percent) 16.00% 10.80%        
Construction | Residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 23 $ 34 $ 30 $ 29 $ 31 $ 36
Loan maturities 1 year          
Minimum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Residential loans typical loan to value range (as a percentage) 75.00%          
Collateralized consumer loans to individuals loan to value maximum range (as a percentage) 80.00%          
Maximum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Residential loans typical loan to value range (as a percentage) 80.00%          
Collateralized consumer loans to individuals loan to value maximum range (as a percentage) 90.00%