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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share

The calculations of basic and diluted earnings per share are as follows:

      Three Months Ended  

Nine Months Ended
     

September 30,

  

September 30,
(In thousands except share and per share data)     2014   2013   2014   2013
Basic                  
       Net income     $ 6,401     $ 6,138     $ 18,247     $ 18,243
       Weighted-average common shares                                
              outstanding       11,480,981       11,450,978       11,482,850       11,435,400
                     Basic earnings per share     $ .56     $ .54     $ 1.59     $ 1.60
Diluted                                
       Net income     $ 6,401     $ 6,138     $ 18,247     $ 18,243
       Weighted-average common shares                                
              outstanding       11,480,981       11,450,978       11,482,850       11,435,400
       Effect of dilutive restricted stock                                
       and stock appreciation rights       151,711       217,085       171,890       191,915
       Weighted-average common shares                                
              outstanding assuming dilution       11,632,692       11,668,063       11,654,740       11,627,315
                     Diluted earnings per share     $ .55     $ .53     $ 1.57     $ 1.57