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Allowance for Loan Losses Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
loan_class
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of classes in the loan portfolio (class) | loan_class 8      
Allowance for loan and lease losses, percent 0.45% 0.45%    
Allowance for loan and lease losses, period increase (decrease) $ 117 $ 117    
Allowance for loan losses $ 10,219 $ 9,916 $ 10,196 $ 10,344
Allowance for loan losses as a percent of total loans 1.02% 1.00% 1.09%  
Number of classes in the commercial loan portfolio (class) | loan_class 3      
Residential loans typical loan to value range, high 80.00%      
Construction loans accrual to company capital 21.80%      
Constructions loan portfolio maximum to company capital 100.00%      
Construction and non owner occupied commercial real estate 106.70%      
Maximum loan portfolio to company capital 300.00%      
Outstanding loans and commitments subject by independent consulting firm 50.00%      
Number of classes in the residential loan portfolio (class) | loan_class 2      
Loan value, lower range 75.00%      
Collateralized consumer loans to individuals loan to value maximum, lower range 80.00%      
Collateralized consumer loans to individuals loan to value maximum, higher range 90.00%      
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Delinquent period before residential loans placed on non accrual status 120 days      
Residential construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 33 $ 24 $ 23 $ 20
Delinquent period before residential loans placed on non accrual status 90 days      
Unallocated Reserves        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 1,591 $ 1,873 $ 1,841  
Percent of total reserve allowance accounted for by loan loss allowances 15.60% 18.90%