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Preferred Stock (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 11, 2013
Dec. 19, 2008
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 19, 2008
Common Stock
May 15, 2012
Preferred Stock
May 09, 2012
Preferred Stock
Dec. 19, 2008
Preferred Stock
Jun. 30, 2013
Preferred Stock
Preferred Stock                        
Number of shares issued                     30,255  
Par value of share issued (in dollars per share)     $ 0.01   $ 0.01   $ 0.01       $ 1,000  
Term of warrants   10 years                    
Number of common shares called per warrant               287,133        
Amount received for participation in U.S. Treasury Department's Capital Purchase Program                     $ 30,255,000  
Number of shares redeemed                 18,255 12,000    
Amount repaid on redemption of shares         18,255,000 12,000,000     18,255,000 12,000,000    
Dividend declared and paid         456,000 747,000     228,187 140,000   456,000
Accretion of discount on preferred stock recognized     206,166 396,380 278,039 515,499     182,209 300,000   278,000
Repurchase price of warrant $ 540,000       $ 540,000              
Repurchase price of warrant (in dollars per share) $ 1.88