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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
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 and the income tax benefit of such awards. The income tax benefit increase in the three and nine months ended September 30, 2017 is due to the implementation of ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This ASU requires all income tax effects of awards to be recognized as income tax expense or benefit in the income statement when the awards vest or are settled. Implementation of the ASU was effective January 1, 2017 and resulted in approximately $9,000 and $846,000 of income tax benefit in the three and nine months ended September 30, 2017, respectively.
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Stock and ESPP Options
 
 
 
 
 
 
 
Pre-tax compensation expense
$
23

 
$
18

 
$
93

 
$
54

Income tax expense (benefit)
(9
)
 
3

 
(313
)
 
12

Stock and ESPP option expense, net of income taxes
$
14

 
$
21

 
$
(220
)
 
$
66

Restricted Stock Awards
 
 
 
 
 
 
 
Pre-tax compensation expense
$
800

 
$
630

 
$
1,791

 
$
1,829

Income tax benefit
(280
)
 
(221
)
 
(1,160
)
 
(640
)
Restricted stock awards expense, net of income taxes
$
520

 
$
409

 
$
631

 
$
1,189

Total Share-Based Compensation
 
 
 
 
 
 
 
Pre-tax compensation expense
$
823

 
$
648

 
$
1,884

 
$
1,883

Income tax benefit
(289
)
 
(218
)
 
(1,473
)
 
(628
)
Total share-based compensation expense, net of income taxes
$
534

 
$
430

 
$
411

 
$
1,255
Stock option activity under stock option plans
Stock option activity under the Corporation's stock option plans as of September 30, 2017 and changes during the nine months ended September 30, 2017, were as follows:
 
Number of
Shares
 
Weighted-Average Exercise Price
 
Weighted Average Remaining
Contractual Term
(in Years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2017
260,211

 
$
19.26

 
 
 
 
Granted


 


 
 
 
 
Exercised
(101,759
)
 
$
22.83

 
 
 
 
Canceled


 


 
 
 
 
Outstanding September 30, 2017
158,452

 
$
16.96

 
2.55
 
$
4,114,422

Vested and Expected to Vest at September 30, 2017
158,452

 
$
16.96

 
2.55
 
$
4,114,422

Exercisable at September 30, 2017
158,452

 
$
16.96

 
2.55
 
$
4,114,422
Unvested RSAs outstanding
The following table summarizes information on unvested RSAs outstanding as of September 30, 2017:
 
Number of Shares
 
Weighted-Average
Grant Date Fair Value
Unvested RSAs at January 1, 2017
328,347

 
$
22.87

Granted
127,757

 
$
40.41

Vested
(84,795
)
 
$
20.45

Forfeited
(4,220
)
 
$
23.11

Unvested RSAs at September 30, 2017
367,089

 
$
29.53