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Allowance for Loan Losses and Credit Quality Indicators (Details 6) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts     $ 1 $ 6
Pre-Modification Recorded Investment     351 1,278
Post-Modification Recorded Investment     318 1,255
Below market interest rate [Member]
        
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts    1    6
Pre-Modification Recorded Investment    72    1,278
Post-Modification Recorded Investment    72    1,255
Below market interest rate [Member] | Non-farm, non-residential [Member]
        
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts          2
Pre-Modification Recorded Investment          480
Post-Modification Recorded Investment          480
Below market interest rate [Member] | Single family owner occupied [Member]
        
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts    1    4
Pre-Modification Recorded Investment    72    798
Post-Modification Recorded Investment    72    775
Extended payment term [Member]
        
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts     1  
Pre-Modification Recorded Investment     351  
Post-Modification Recorded Investment     318  
Extended payment term [Member] | Single family owner occupied [Member]
        
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts     1  
Pre-Modification Recorded Investment     351  
Post-Modification Recorded Investment     $ 318