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Loans and Allowance for Loan Losses (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Loans and Allowance for Loan Losses (Textual) [Abstract]      
Total loans $ 1,022,956,000 $ 1,051,674,000 $ 1,041,189,000
Amount of decrease in total loans 18,200,000    
Percentage decrease in total loans 1.80%    
Interest income recognized on impaired loans $ 600,000    
Number of past due days for loans modified as TDR 30 days 30 days