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Allowance for Loan Losses Allowance for Loan Losses Narrative (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
loan
Jun. 30, 2012
loan
Jun. 30, 2013
loan
Jun. 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 $ 12,670,000 $ 14,384,000 $ 12,670,000 $ 14,384,000 $ 12,720,000 $ 12,500,000 $ 12,954,000 $ 13,000,000
Loan value, lower range 75.00%   75.00%          
Construction loans accrual to company capital 18.40%   18.40%          
Contstructions loan portfolio maximum to company captial 100.00%   100.00%          
Construction and non owner occupied commercial real estate 74.10%   74.10%          
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 105 82 105 82   101    
Balance 30,874,000 24,980,000 30,874,000 24,980,000   29,955,000    
Number of contracts greater than 30 days past due 12 13 12 13        
Recorded investment greater than 30 days past due 2,197,000 2,487,000 2,197,000 2,487,000        
Number of loans classified as TDR in previous 12 months 2 6 2 6        
Loans classified as TDR in last 12 months 524,000 864,000 524,000 864,000        
Number of Loans 3 15 10 29        
Pre-Modification Outstanding Recorded Investment 936,000 5,105,000 3,890,000 8,107,000        
Number of TDR loans that are involved in bankruptcy 10   10          
Loans classified as TDR that are involved in bankruptcy 970,000   970,000          
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 4,027,000   4,027,000          
Number of loans classified as TDR involved in foreclosure 5   5          
Loans classified as TDR that are involved in Foreclosure 450,000   450,000          
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 9,000 58,000 9,000 58,000 9,000 11,000 59,000 255,000
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 1,275,000 1,895,000 1,275,000 1,895,000 1,089,000 842,000 1,699,000 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 1,275,000 1,895,000 1,275,000 1,895,000   842,000    
Unallocated Reserves [Member] | Unallocated Financing Receivables [Member]
                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Less allowance for loan losses $ 1,275,000 $ 1,895,000 $ 1,275,000 $ 1,895,000   $ 842,000