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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2013
Stock-Based Compensation [Abstract]  
Summary of Restricted Stock Activity

Following is a summary of the activity of the restricted stock:

    Nine Months Ended
    September 30, 2013
        Shares       Fair Value
Balance at December 31, 2012   54,875     $ 31.61
Granted   30,185     $ 42.03
Vested       (25,608 )   $ 30.48
Balance at September 30, 2013   59,452     $ 37.39

Summary of SARs Activity

Following is a summary of the activity of the Company's SARs program for the nine-month period ended September 30, 2013:

          Weighted-   Average   Aggregate
          Average   Remaining   Intrinsic
          Exercise   Contractual   Value
        Shares       Price       Term Years       (In thousands)
Outstanding at December 31, 2012   351,881     $           27.52   7.34   $                  4,988
Granted   85,943     $ 42.14          
Exercised      (76,259 )   $ 24.95          
Outstanding at September 30, 2013   361,565     $ 31.58   7.42   $ 7,877
Exercisable at September 30, 2013   184,437     $ 26.28   6.15   $ 4,997

Summary of Non-vested SARs Activity

Following is a summary of the activity of the non-vested SARs during the nine-month period ended September 30, 2013:

          Weighted-Average
        Shares       Grant Date Fair Value
Non-vested at December 31, 2012   161,294     $ 31.70
Granted   85,943     $ 42.14
Vested      (70,109 )   $ 30.85
Non-vested at September 30, 2013   177,128     $ 37.11

Schedule of Assumptions used in SARs Granted

The Company uses the Black-Scholes pricing model to determine the fair value of the SARs at the date of grant. Following are the assumptions used to estimate the per-share fair value of SARs granted:

    Nine Months Ended September 30,
        2013       2012
Risk-free interest rate   1.29%   1.38%
Expected life   7 yrs.   7 yrs.
Expected volatility   28.72%   29.39%
Expected dividend yield   1.71%   1.84%