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Loans (Narrative) (Details) (USD $)
6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
May 31, 2011
Dec. 31, 2010
Jun. 30, 2010
Jun. 30, 2011
Commercial Real Estate [Member]
Jun. 30, 2011
Non-Accrual Loans [Member]
Jun. 30, 2010
Non-Accrual Loans [Member]
Jun. 30, 2011
Non-Accrual Loans [Member]
Jun. 30, 2010
Non-Accrual Loans [Member]
Jun. 30, 2011
Grade 13 [Member]
Percentage of owner occupied commercial real estate loans         61.00%          
Maximum loan to value percentage on home equity loans 80.00%                  
Concentration of loans in a single industry in excess of ten percent $ 0                  
Maximum percentage loan related to single industry 10.00%                  
Additional interest that would have been recognized on non-accrual loans, net of tax           861,000 964,000 1,700,000 2,000,000  
Number of loans with calculated risk of Ten or higher 4                  
Loan amount threshold 5,000,000                  
Loan value with weighted-average loan-to-value 26,300,000                  
Weighted average loan to value ratio 47.10%                  
Lot and single family resident loan pool loan-to-value ration cieling 80.00%                  
Loan amount structural as borrowing base facility 6.1                  
Number of days past due for payment of interest on loans, minimum 120                  
Percent of valuation allowance in excess of principal balance, maximum 30.00%                 30.00%
Credit quality indicators   122.8 118.2 113.5            
Origination of loans 1,000,000                  
Dollar impact of environment adjustment factor $ 12,800,000   $ 9,500,000 $ 10,200,000