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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share
 Three Months Ended       Nine Months Ended     
 September 30,   September 30,     
(In thousands except share and per share data)  2015     2014    2015   2014 
Basic                    
       Net income 5,880     6,401     $ 16,967   $ 18,247

       Weighted-average common shares

              outstanding

    11,329,002       11,480,981     11,385,680   11,482,850
                     Basic earnings per share   .52     .56     $ 1.49   $ 1.59
Diluted    
     
     
       Net income 5,880     6,401     $ 16,967   $ 18,247

       Weighted-average common shares

               outstanding

    11,329,002       11,480,981     11,385,680   11,482,850

       Effect of dilutive restricted stock

       and stock appreciation rights

  158,177       151,711     161,005   171,890

       Weighted-average common shares

              outstanding assuming dilution

    11,487,179       11,632,692     11,546,685   11,654,740
                     Diluted earnings per share   .51     .55     $ 1.47   $ 1.57