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Allowance for Loan Losses and Credit Quality Indicators (Details 6) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts     $ 1 $ 5
Pre-Modification Recorded Investment     351 1,206
Post-Modification Recorded Investment     318 1,183
Below market interest rate [Member]
        
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts    3    5
Pre-Modification Recorded Investment    818    1,206
Post-Modification Recorded Investment    818    1,183
Below market interest rate [Member] | Non-farm, non-residential [Member]
        
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts    1    2
Pre-Modification Recorded Investment    373    480
Post-Modification Recorded Investment    373    480
Below market interest rate [Member] | Single family owner occupied [Member]
        
Loans modified as troubled debt restructurings excluding those on nonaccrual status        
Total Contracts    2    3
Pre-Modification Recorded Investment    445    726
Post-Modification Recorded Investment    445    703
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