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Preferred Stock (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jun. 11, 2013
Dec. 19, 2008
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 19, 2008
Common Stock
May 15, 2013
Preferred Stock
May 09, 2012
Preferred Stock
Dec. 19, 2008
Preferred Stock
Dec. 31, 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                             $ 30,300,000  
Number of shares redeemed                         18,255 12,000    
Amount repaid on redemption of shares                 18,255,000 12,000,000     18,300,000 12,000,000    
Dividend declared and paid                 456,000 1,203,000 1,513,000   228,187 140,000   456,000
Accretion of discount on preferred stock recognized     206,000 72,000 72,000 72,000 396,000 119,000 278,000 659,000 476,000   182,209 300,000   278,000
Repurchase price of warrant $ 540,000               $ 540,000              
Repurchase price of warrant (in dollars per share) $ 1.88