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Allowance for Loan Losses (Details 3) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Information regarding loans modified under TDR        
Number of Contracts $ 1 $ 1 $ 2 $ 15
Pre-modification outstanding recorded investment 183,000 701,000 2,609,000 13,000,000
Post-modification outstanding recorded investment 183,000 357,000 2,609,000 12,682,000
Commercial and industrial [Member]
        
Information regarding loans modified under TDR        
Number of Contracts            
Pre-modification outstanding recorded investment            
Post-modification outstanding recorded investment            
Consumer and other loans [Member]
        
Information regarding loans modified under TDR        
Number of Contracts            
Pre-modification outstanding recorded investment            
Post-modification outstanding recorded investment            
Other real estate loans [Member] | Real estate loans [Member]
        
Information regarding loans modified under TDR        
Number of Contracts       1 12
Pre-modification outstanding recorded investment       2,426,000 11,724,000
Post-modification outstanding recorded investment       2,426,000 11,750,000
Construction and land development [Member] | Real estate loans [Member]
        
Information regarding loans modified under TDR        
Number of Contracts    1    1
Pre-modification outstanding recorded investment    701,000    701,000
Post-modification outstanding recorded investment    357,000    357,000
Secured by 1-4 family residential [Member] | Real estate loans [Member]
        
Information regarding loans modified under TDR        
Number of Contracts 1    1 2
Pre-modification outstanding recorded investment 183,000    183,000 575,000
Post-modification outstanding recorded investment $ 183,000    $ 183,000 $ 575,000