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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2015
Stock-Based Compensation [Abstract]  
Summary of Restricted Stock Activity
Nine Months Ended
September 30, 2015
Shares Fair Value 
Balance at December 31, 2014 51,161     $ 48.13
Granted 41,896     $ 51.02
Vested   (24,644 )   $ 44.18
Forfeits   (262 )   52.63
Balance at September 30, 2015   68,151     $ 51.32
Summary of SARs Activity
      Weighted-   Average   Aggregate  
      Average   Remaining   Intrinsic 
      Exercise   Contractual   Value 
  Shares      Price   Term Years   (In thousands) 
Outstanding at December 31, 2014
353,955     $ 35.52
6.77
$ 6,277
Exercised   (37,834   $ 28.56    
Forfeits    (1,204 )   $ 53.96          
Outstanding at September 30, 2015   314,917     $ 36.28   6.19   $ 4,046
Exercisable at September 30, 2015   262,410     $ 33.30   5.85   $ 4,153
Summary of Non-vested SARs Activity
    Weighted-Average 
Shares   Grant Date Fair Value 
Non-vested at December 31, 2014 124,982     $ 45.85
Vested (71,514 )   $ 41.87
Forfeits   (961 )   $ 52.02
Non-vested at September 30, 2015   52,507     $ 51.17
Schedule of Assumptions used in SARs Granted
Nine Months Ended September 30,
      2015       2014
Risk-free interest rate N/A   2.38 %
Expected life N/A 7 yrs
Expected volatility   N/A 28.11 %
Expected dividend yield N/A 1.30 %