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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2012
Assumptions Used In 2012 Black Scholes Model
The estimated fair value of the stock options granted during 2012 and in prior years was calculated using a Black Scholes option pricing model.  The following summarizes the assumptions used in the 2012 Black Scholes model:

Risk-free interest rate
   1.36 %
Expected price volatility
   46.22 %
Dividend yield
   3.29 %
Forfeiture rate
   4.77 %
Weighted-average expected life, until exercise
  
7.2
 years
Components of Share Based Compensation Awards
The following table summarizes the components of the Corporation's share-based compensation awards recorded as expense:

   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
   
2012
    
2011
    
2012
    
2011
  
Stock and ESPP Options
                        
Pre-tax compensation expense
  
$
71
    
$
56
    
$
197
    
$ 
165
  
Income tax benefit
    
(11
)
    
(7
)
    
(13
)
    
(8
)
Stock and ESPP option expense, net of income taxes
  
$
60
    
$
49
    
$
184
    
$
157
  
Restricted Stock Awards
                                
Pre-tax compensation expense
  
$
344
    
$
234
    
$
904
    
$
844
  
Income tax benefit
    
(104
)
    
(76
)
    
(322
)
    
(289
)
Restricted stock awards expense, net of income taxes
  
$
240
    
$
158
    
$
582
    
$
555
  
Total Share-Based Compensation:
                                
Pre-tax compensation expense
  
$
415
    
$
290
    
$
1,101
    
$
1,009
  
Income tax benefit
    
(115
)
    
(83
)
    
(335
)
    
(297
)
Total share-based compensation expense, net of income taxes
  
$
300
    
$
207
    
$
766
    
$
712
  
Stock Option Activity Under Stock Option Plans
Stock option activity under the Corporation's stock option plans as of September 30, 2012 and changes during the nine months ended September 30, 2012, were as follows:

   
Number of
Shares
    
Weighted-Average Exercise Price
    
Weighted Average Remaining
Contractual Term
(in Years)
    
Aggregate
Intrinsic
Value
  
Outstanding at January 1, 2012
    
1,035,871
    
$
22.57
              
Granted/ Converted
    
46,801
    
$
11.69
              
Exercised
    
(8,750
)
  
$
7.69
              
Cancelled
    
(165,536
)
  
$
25.87
              
Outstanding September 30, 2012
    
908,386
    
$
21.55
      
4.33
      
1,097,884
  
Vested and Expected to Vest at September 30, 2012
    
908,386
    
$
21.55
      
4.33
      
1,097,884
  
Exercisable at September 30, 2012
    
830,336
    
$
22.58
      
3.89
      
760,073
  
Unvested RSAs Outstanding
The following table summarizes information on unvested RSAs outstanding as of September 30, 2012:

   
Number of
Shares
    
Weighted-Average
Grant Date Fair Value
  
Unvested RSAs at January 1, 2012
    
338,087
    
$
8.65
  
Granted
    
156,473
    
$
11.79
  
Forfeited
    
(8,800
)
  
$
9.63
  
Vested
    
(79,386
)
  
$
11.90
  
Unvested RSAs at September 30, 2012
    
406,374
    
$
9.18