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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 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 an expense and the income tax benefit of such awards. The income tax benefit increase for the year ended December 31, 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 $935,000 of income tax benefit for the year ended December 31, 2017.
 
Years Ended December 31,
 
2017
 
2016
 
2015
Stock and ESPP Options
 
 
 
 
 
Pre-tax compensation expense
$
121

 
$
76

 
$
101

Income tax expense (benefit)
(322
)
 
18

 
4

Stock and ESPP option expense, net of income taxes
$
(201
)
 
$
94

 
$
105

Restricted Stock Awards
 
 
 
 
 
Pre-tax compensation expense
$
2,706

 
$
2,524

 
$
2,169

Income tax benefit
(1,561
)
 
(883
)
 
(749
)
Restricted stock awards expense, net of income taxes
$
1,145

 
$
1,641

 
$
1,420

Total Share-Based Compensation:
 
 
 
 
 
Pre-tax compensation expense
$
2,827

 
$
2,600

 
$
2,270

Income tax benefit
(1,883
)
 
(865
)
 
(745
)
Total share-based compensation expense, net of income taxes
$
944

 
$
1,735

 
$
1,525
Stock Option Activity Under Stock Option Plans
Stock option activity under the Corporation's stock option plans, as of December 31, 2017, and changes during the year ended December 31, 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

 
 
 
 
Exercised
(104,748
)
 
$
22.90

 

 

Canceled
(2,811
)
 
$
22.21

 
 
 
 
Outstanding December 31, 2017
152,652

 
$
16.71

 
2.36
 
$
3,870,499

Vested and Expected to Vest at December 31, 2017
152,652

 
$
16.71

 
2.36
 
$
3,870,499

Exercisable at December 31, 2017
152,652

 
$
16.71

 
2.36
 
$
3,870,499
Summary of Unvested RSAs Outstanding
The following table summarizes information on unvested RSAs outstanding as of December 31, 2017:
 
Number of
Shares
 
Weighted-Average
Grant Date Fair Value
Unvested RSAs at January 1, 2017
328,347

 
$
22.87

Granted
132,710

 
$
40.47

Forfeited
(4,702
)
 
$
23.63

Vested
(89,362
)
 
$
20.53

Unvested RSAs at December 31, 2017
366,993

 
$
29.79