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Allowance for Loan Losses - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
loan_class
Dec. 31, 2018
USD ($)
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) 0.46% 0.45%    
Allowance for loan and lease losses, period increase (decrease) $ 193      
Allowance for loan losses $ 11,490 $ 11,232 $ 10,957 $ 10,729
Allowance for loan losses as a percent of total loans 0.91%   0.92%  
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 29.40%      
Constructions loan portfolio maximum to company capital 100.00%      
Construction and non owner occupied commercial real estate 128.40%      
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 $ 660 630 $ 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 $ 630 730 716 692
Loan-to-value ratio 0.80      
Loan maturities 300 months      
Unallocated Reserves        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 1,644 $ 1,216 811  
Total reserve allowance accounted for by loan loss allowances (percent) 14.30% 10.80%    
Construction | Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 30 $ 34 $ 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%