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Allowance for Loan Losses Allowance for Loan Losses Narrative (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
loan
Sep. 30, 2012
loan
Sep. 30, 2013
loan
Sep. 30, 2012
loan
Mar. 31, 2013
Dec. 31, 2012
loan
Mar. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Less allowance for loan losses $ 12,457,000 $ 14,739,000 $ 12,457,000 $ 14,739,000 $ 12,670,000 $ 12,500,000 $ 14,384,000 $ 13,000,000
Loan value, lower range 75.00%   75.00%          
Construction loans accrual to company capital 21.00%   21.00%          
Contstructions loan portfolio maximum to company captial 100.00%   100.00%          
Construction and non owner occupied commercial real estate 75.10%   75.10%          
Construction and non owner occupied commercial real estae maximum 300.00%   300.00%          
Outstanding loans and commitments subject by independent consulting firm 50.00%   50.00%          
Residential loans typical loan to value range, high 80.00%   80.00%          
Collateralized consumer loans to individuals loan to value maximum, lower range 80.00%   80.00%          
Collateralized consumer loans to individuals loan to value maximum, higher range 90.00%   90.00%          
Number of Loans 104 91 104 91   101    
Balance 29,921,000 29,349,000 29,921,000 29,349,000   29,955,000    
Number of contracts greater than 30 days past due 18 15 18 15        
Recorded investment greater than 30 days past due 2,495,000 2,820,000 2,495,000 2,820,000        
Number of loans classified as TDR in previous 12 months 5 6 5 6        
Loans classified as TDR in last 12 months 957,000 970,000 957,000 970,000        
Number of Loans 3 11 10 38        
Post-Modification Outstanding Recorded Investment 410,000 4,512,000 3,336,000 12,369,000        
Pre-Modification Outstanding Recorded Investment 447,000 4,513,000 3,389,000 12,591,000        
Number of TDR loans that are involved in bankruptcy 16   16          
Loans classified as TDR that are involved in bankruptcy 1,799,000   1,799,000          
Number of loans classified as TDR that were on non accrual status 23   23          
Financing Receivalbe, Number of Loans Classified As Troubled Debt Restructurings Classifed As NonAccrual 3,757,000   3,757,000          
Number of loans classified as TDR involved in foreclosure 6   6          
Loans classified as TDR that are involved in Foreclosure 656,000   656,000          
Consumer Loan [Member]
                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Deliquent period before residential loans placed on non accrual status     120 days          
Residential Construction [Member]
                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Less allowance for loan losses 15,000 14,000 15,000 14,000 9,000 11,000 58,000 255,000
Deliquent period before residential loans placed on non accrual status     90 days          
Unallocated Financing Receivables [Member]
                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Less allowance for loan losses 1,544,000 1,760,000 1,544,000 1,760,000 1,275,000 842,000 1,895,000 2,008,000
Number of days past due 30 days 30 days            
Unallocated Reserves [Member]
                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Less allowance for loan losses 1,544,000 1,760,000 1,544,000 1,760,000   842,000    
Unallocated Reserves [Member] | Unallocated Financing Receivables [Member]
                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Less allowance for loan losses $ 1,544,000 $ 1,760,000 $ 1,544,000 $ 1,760,000   $ 842,000