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Loans (Narrative) (Details) (USD $)
9 Months Ended9 Months Ended9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
days
Aug. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Sep. 30, 2011
Commercial And Industrial, Other Commercial [Member]
Sep. 30, 2011
Commercial Real Estate, Buildings, Land And Other [Member]
Sep. 30, 2011
Consumer Real Estate [Member]
Sep. 30, 2011
Consumer And Other [Member]
Sep. 30, 2011
Non-Accrual Loans [Member]
Sep. 30, 2010
Non-Accrual Loans [Member]
Sep. 30, 2011
Non-Accrual Loans [Member]
Sep. 30, 2010
Non-Accrual Loans [Member]
Sep. 30, 2011
Grade 13 [Member]
Dec. 31, 2010
Troubled Debt Restructurings [Member]
Percentage of owner occupied commercial real estate loans      60.00%       
Maximum loan to value percentage on home equity loans80.00%             
Concentration of loans in single industry in excess of ten percent$ 0             
Maximum percentage loan related to single industry10.00%             
Additional interest that would have been recognized on non-accrual loans, net of tax        823,000944,0002,600,0002,900,000  
Number of loans with calculated risk of Ten or higher4             
Loan amount threshold5,000,000             
Loan value with weighted-average loan-to-value29,700,000             
Loans restructured as troubled debt restructurings8,700,000   191,0007,100,000960,000469,000      
Troubled debt restructurings             0
Weighted-average-loan-to-value ratio62.40%             
Lot and single family resident loan pool loan-to-value ratio ceiling80.00%             
Loan amount structural as borrowing base facility7,300,000             
Number of days past due for payment of interest on loans, minimum120   180         
Percent of valuation allowance in excess of principal balance, maximum30.00%           30.00% 
Credit quality indicators 119.6118.2115.2          
Origination of loans1,000,000             
Dollar impact of environment adjustment factor$ 13,600,000 $ 9,500,000$ 10,100,000