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Troubled Debt Restructurings (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
contract
Sep. 30, 2011
Sep. 30, 2012
contract
Sep. 30, 2011
Dec. 31, 2011
contract
Troubled Debt Restructuring, Subsequent Periods [Line Items]          
Number of troubled debt restructured loans 24   24   25
Total troubled debt restructured loans $ 8.4   $ 8.4   $ 10.7
Number of loans restructured one one three eight  
Loan is considered payment default     30 days    
Commercial Real Estate Owner Occupied [Member]
          
Troubled Debt Restructuring, Subsequent Periods [Line Items]          
Number of loans restructured by changing amortization period     one    
Residential Single Family [Member]
          
Troubled Debt Restructuring, Subsequent Periods [Line Items]          
Number of loans restructured       Six  
Loans restructured by granting interest rate reductions     One Three  
Loans restructured by payment requirements modification       two  
Construction And Farmland [Member]
          
Troubled Debt Restructuring, Subsequent Periods [Line Items]          
Number of loans restructured     one    
Number of loans restructured by changing amortization period One        
Commercial Real Estate [Member]
          
Troubled Debt Restructuring, Subsequent Periods [Line Items]          
Number of loans restructued by consolidation of debt       Two