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Computation of Earnings per Share
3 Months Ended
Mar. 31, 2013
Earnings per common share  
Earnings Per Share [Text Block]

(In thousands, except per share data)

              
   Three months ended March 31,
   2013 2012
   Basic Diluted Basic Diluted
 Net income$ 15,100 $ 15,100 $ 13,178 $ 13,178
              
 Weighted average common shares outstanding  12,674   12,674   12,619   12,619
 Effect of diluted securities           
  Stock options and restricted stock     35      29
              
 Weighted average diluted shares outstanding     12,709      12,648
 Earnings per share$ 1.19 $ 1.19 $ 1.04 $ 1.04
              
 Anti-dilutive shares excluded from calculation     -       -
              
   Six months ended March 31,
   2013 2012
   Basic Diluted Basic Diluted
 Net income$ 31,851 $ 31,851 $ 26,374 $ 26,374
              
 Weighted average common shares outstanding  12,669   12,669   12,600   12,600
 Effect of diluted securities           
  Stock options and restricted stock     33      26
              
 Weighted average diluted shares outstanding     12,702      12,626
 Earnings per share$ 2.51 $ 2.51 $ 2.09 $ 2.09
              
 Anti-dilutive shares excluded from calculation     -       -