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Common Stock and Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Common Stock and Earnings per Share [Abstract]  
Schedule of Common Stock Outstanding
2015
Shares outstanding at January 1       11,502,575
Issuance of common stock:
       Employee restricted stock grants 26,542
       Employee SARs exercised 12,154
       Directors' compensation 7,675
Shares repurchased (216,412 )
Shares forfeited   (262 )
Shares outstanding at December 31 11,332,272
Schedule of the Calculations of Basic and Diluted Earnings per Share
  December 31,
(In thousands except share and per share data)   2015   2014   2013
Basic          
       Net income   $           23,056   $ 24,033   $ 23,497
       Weighted average common shares outstanding     11,358,609   11,479,025   11,441,158
                     Basic earnings per share     $ 2.03   $ 2.09   $ 2.05
Diluted        
       Net income   $ 23,056
   $ 24,033   $ 23,497
       Weighted average common shares outstanding     11,358,609
   11,479,025   11,441,158
       Effect of dilutive restricted stock and SARs   159,819   164,954   199,581
       Weighted average common shares outstanding        
              assuming dilution     11,518,428   11,643,979   11,640,739
                     Diluted earnings per share     $ 2.00   $ 2.06   $ 2.02