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Common Stock and Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2013
Common Stock and Earnings per Share [Abstract]  
Schedule of Common Stock Outstanding

The table below shows activity in the outstanding shares of the Company's common stock during 2013.

  2013
Shares outstanding at January 1 11,463,831
Issuance of common stock:  
       Issued under stock-based compensation plan 30,407
       SARs exercised 27,242
Shares outstanding at December 31 11,521,480
Schedule of the Calculations of Basic and Diluted Earnings per Share

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

          December 31,      
(In thousands except share and per share data)   2013   2012   2011
Basic                              
       Net income   $ 23,497   $ 23,303   $ 23,009
       Weighted average common shares outstanding     11,441,158     11,378,216     11,326,968
                     Basic earnings per share   $ 2.05   $ 2.05   $ 2.03
Diluted                  
       Net income   $ 23,497   $ 23,303   $ 23,009
       Weighted average common shares outstanding          11,441,158          11,378,216          11,326,968
       Effect of dilutive restricted stock and SARs     199,581     178,998     148,652
       Weighted average common shares outstanding                  
              assuming dilution     11,640,739     11,557,214     11,475,620
                     Diluted earnings per share   $ 2.02   $ 2.02   $ 2.01