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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
                         
    Three Months Ended March 31, 2013
(Unaudited)		  
    Net Income     Shares     Per Share  

Basic earnings per share

                        

Income available to common stockholders

   $ 6,928       12,502,378     $ 0.55  

Effect of dilutive securities

                        

Options to purchase common stock

     —         278,130       —    
   

 

 

    

 

 

    

 

 

  

Diluted earnings per share

                        

Income available to common stockholders plus assumed exercise of options to purchase common stock

   $ 6,928       12,780,508     $ 0.54  
   

 

 

    

 

 

    

 

 

  

 

                         
    Three Months Ended March 31, 2012
(Unaudited)		  
    Net Income     Shares     Per Share  

Basic earnings per share

                        

Income available to common stockholders

   $ 5,122       9,336,727     $ 0.55  

Effect of dilutive securities

                        

Options to purchase common stock

     —         279,770       —    
   

 

 

    

 

 

    

 

 

  

Diluted earnings per share

                        

Income available to common stockholders plus assumed exercise of options to purchase common stock

   $ 5,122         9,616,497     $ 0.53