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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Stock and ESPP Options
 
 
 
 
 
 
 
Pre-tax compensation expense
$
18

 
$
23

 
$
54

 
$
78

Income tax expense (benefit)
3

 
5

 
12

 
4

Stock and ESPP option expense, net of income taxes
$
21

 
$
28

 
$
66

 
$
82

Restricted Stock Awards
 
 
 
 
 
 
 
Pre-tax compensation expense
$
630

 
$
533

 
$
1,829

 
$
1,609

Income tax benefit
(221
)
 
(187
)
 
(640
)
 
(552
)
Restricted stock awards expense, net of income taxes
$
409

 
$
346

 
$
1,189

 
$
1,057

Total Share-Based Compensation
 
 
 
 
 
 
 
Pre-tax compensation expense
$
648

 
$
556

 
$
1,883

 
$
1,687

Income tax benefit
(218
)
 
(182
)
 
(628
)
 
(548
)
Total share-based compensation expense, net of income taxes
$
430

 
$
374

 
$
1,255

 
$
1,139
Stock option activity under stock option plans
Stock option activity under the Corporation's stock option plans as of September 30, 2016 and changes during the nine months ended September 30, 2016, were as follows:
 
Number of
Shares

Weighted-Average Exercise Price

Weighted Average Remaining
Contractual Term
(in Years)

Aggregate
Intrinsic
Value
Outstanding at January 1, 2016
442,012


$
19.99


 

 
Granted
—





 

 
Exercised
(22,385
)

$
13.80


 

 
Canceled
(52,953
)

$
25.09


 

 
Outstanding September 30, 2016
366,674


$
19.63


2.79

2,691,404

Vested and Expected to Vest at September 30, 2016
366,674


$
19.63


2.79

2,691,404

Exercisable at September 30, 2016
366,674


$
19.63


2.79

2,691,404
Unvested RSAs outstanding
The following table summarizes information on unvested RSAs outstanding as of September 30, 2016:
 
Number of Shares

Weighted-Average
Grant Date Fair Value
Unvested RSAs at January 1, 2016
354,504


$
19.65

Granted
121,034


$
23.61

Vested
(110,251
)

$
15.46

Forfeited
(7,711
)

$
21.96

Unvested RSAs at September 30, 2016
357,576


$
22.54