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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Earnings per share, basic and diluted
                 
    Three Months Ended
March 31,		  
    2013     2012  
    (in thousands, except per share amounts)  

Basic EPS:

                

Net income, as reported

   $ 8,851     $ 9,561  

Less allocated income to unvested shares

     15       5  
   

 

 

    

 

 

  

Net income available to common shareholders - basic

   $ 8,836     $ 9,556  
   

 

 

    

 

 

  

Basic weighted average common shares

     18,281,353       18,140,749  
   

 

 

    

 

 

  

Basic earnings per common share

   $ 0.48     $ 0.53  
   

 

 

    

 

 

  

Diluted EPS:

                

Net income available to common shareholders

   $ 8,836     $ 9,556  
   

 

 

    

 

 

  

Diluted weighted average common shares:

                

Weighted average common shares

     18,281,353       18,140,749  

Stock options and performance shares

     408,489       395,230  
   

 

 

    

 

 

  

Diluted weighted average common shares

     18,689,842       18,535,979  
   

 

 

    

 

 

  

Diluted earnings per common share

   $ 0.47     $ 0.52