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Allowance for Loan Losses Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan and lease losses, percent 0.42% 0.39%        
Allowance for loan and lease losses, period increase (decrease) $ 465 $ 465        
Less allowance for loan losses $ 9,677 $ 10,344 $ 9,908 $ 11,641 $ 11,644 $ 11,514
Allowance for loan losses as a percent of total loans 1.00% 1.13%   1.28%    
Residential loans typical loan to value range, high 80.00%          
Construction loans accrual to company capital 25.00%          
Constructions loan portfolio maximum to company capital 100.00%          
Construction and non owner occupied commercial real estate 99.10%          
Maximum loan portfolio to company capital 300.00%          
Outstanding loans and commitments subject by independent consulting firm 50.00%          
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]            
Less allowance for loan losses $ 22 $ 20 $ 27 $ 20 $ 23 $ 21
Delinquent period before residential loans placed on non accrual status 90 days          
Unallocated Reserves            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Less allowance for loan losses $ 1,926 $ 1,662   $ 2,113    
Percent of total reserve allowance accounted for by loan loss allowances 19.90% 16.10%