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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-Based Compensation  
Schedule of stock option activity

 

 

 
   Years Ended December 31,  
 
   2013   2012   2011  
 
   Shares   Weighted
Average
Exercise
Price		   Shares   Weighted
Average
Exercise
Price		   Shares   Weighted
Average
Exercise
Price		  

Outstanding at January 1

     340,140   $ 31.79     370,207   $ 30.69     386,207   $ 29.02  

Granted

     23,007     41.45     28,224     31.75     27,542     32.05  

Exercised

     (65,555 )   28.75     (51,887 )   23.99     (43,533 )   16.79  

Forfeited

     (220 )   27.22     (6,150 )   31.80     (1 )   11.39  

Expired

     (1,456 )   22.17     (254 )   15.93     (8 )   15.64  
                                 
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Outstanding at December 31

     295,916     33.26     340,140     31.79     370,207     30.69  
                                 
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Exercisable at December 31

     233,566     32.66     267,941     31.73     285,987     30.38  
                                 
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Weighted-average fair value of options granted during the year

         $ 15.66         $ 11.55         $ 11.65  
                                 
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Schedule of information pertaining to options outstanding

 Information pertaining to options outstanding at December 31, 2013, is as follows:

 
    
   Options Outstanding   Options Exercisable
 
   Range of
Exercise Prices		   Number
Outstanding		   Weighted
Average
Remaining
Contractual
Life		   Weighted
Average
Exercise Price		   Number
Outstanding		   Weighted
Average
Exercise Price		   Weighted
Average
Remaining
Contractual
Life
    $25.01 - $30.00     46,400   4.3 years     27.48     46,385     27.48    
    $30.01 - $35.00     162,627   4.6 years     31.82     127,100     31.81    
    $35.01 - $40.00     61,482   4.2 years     38.07     56,035     38.26    
    $40.01 - $45.00     25,407   8.8 years     41.41     4,046     41.18    
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
          295,916   4.8 years     33.26     233,566     32.66   4.0 years
                                 
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Schedule of weighted-average assumptions used in valuing options

 

 

 
   2013   2012   2011

Dividend yield

   1.70%   2.10%   2.23%

Expected life

   6 years   6 years   5 years

Expected volatility

   45.7% - 45.7%   45.8% - 45.8%   43.8% - 49.7%

Risk-free interest rate

   1.02%   1.06%   2.32%
Summary of nonvested restricted stock

 

 

Restricted Stock
  Shares   Weighted-
Average
Grant-Date
Fair Value		  

Nonvested at January 1, 2013

     172,847   $ 30.84  

Granted

     83,760     43.33  

Vested

     (23,391 )   32.43  

Forfeited

     (669 )   39.16  
             
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Nonvested at December 31, 2013

     232,547     35.15  
             
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Vesting schedule of shares

 The vesting schedule of these shares as of December 31, 2013 is as follows:

 
   Shares  

2014

     25,899  

2015

     45,972  

2016

     64,345  

2017

     54,142  

2018

     16,520  

Thereafter

     25,669  
       
​ ​ ​ ​ ​

 

     232,547  
       
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Summary of nonvested RSUs

 

 

Restricted Stock Units
  Shares   Weighted-
Average
Grant-Date
Fair Value		  

Nonvested at January 1, 2013

     —   $ —  

Granted

     43,820     51.01  
             
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Nonvested at December 31, 2013

     43,820     51.01  
             
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