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Allowance for Loan Losses Narrative (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
loan_class
Dec. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of classes in the loan portfolio (loan class) | loan_class 8          
Allowance for loan and lease losses, percent 0.44% 0.45%        
Allowance for loan and lease losses, period increase (decrease) $ 149 $ 117        
Overlay in pooled reserves 1,000          
Allowance for loan losses $ 10,198 $ 9,916 $ 10,219 $ 9,908 $ 10,196 $ 10,344
Allowance for loan losses as a percent of total loans 0.98% 1.00%   1.03%    
Number of classes in the commercial loan portfolio (loan class) | loan_class 3          
Residential loans typical loan to value range, maximum 80.00%          
Construction loans accrual to company capital 21.40%          
Constructions loan portfolio maximum to company capital 100.00%          
Construction and non owner occupied commercial real estate 105.60%          
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 (loan 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 $ 34 $ 24 $ 33 $ 27 $ 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 $ 1,216 $ 1,873   $ 1,864    
Percent of total reserve allowance accounted for by loan loss allowances 11.90% 18.90%