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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
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.
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Stock and ESPP Options
 
 
 
 
 
 
 
Pre-tax compensation expense
$
24

 
$
22

 
$
49

 
$
70

Income tax benefit
(80
)
 
(59
)
 
(138
)
 
(305
)
Stock and ESPP option expense, net of income taxes
$
(56
)
 
$
(37
)
 
$
(89
)
 
$
(235
)
Restricted Stock Awards
 
 
 
 
 
 
 
Pre-tax compensation expense
$
752

 
$
466

 
$
1,604

 
$
991

Income tax benefit
(181
)
 
(170
)
 
(747
)
 
(880
)
Restricted stock awards expense, net of income taxes
$
571

 
$
296

 
$
857

 
$
111

Total Share-Based Compensation
 
 
 
 
 
 
 
Pre-tax compensation expense
$
776

 
$
488

 
$
1,653

 
$
1,061

Income tax benefit
(261
)
 
(229
)
 
(885
)
 
(1,185
)
Total share-based compensation expense, net of income taxes
$
515

 
$
259

 
$
768

 
$
(124
)
Stock option activity under stock option plans
Stock option activity under the Corporation's stock option plans as of June 30, 2018 and changes during the six months ended June 30, 2018, were as follows:
 
Number of
Shares
 
Weighted-Average Exercise Price
 
Weighted Average Remaining
Contractual Term
(in Years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2018
152,652

 
$
16.71

 
 
 
 
Exercised
(44,932
)
 
$
21.20

 
 
 
 
Cancelled
(200
)
 
$
28.25

 
 
 
 
Outstanding June 30, 2018
107,520

 
$
14.80

 
2.54
 
$
3,397,202

Vested and Expected to Vest at June 30, 2018
107,520

 
$
14.80

 
2.54
 
$
3,397,202

Exercisable at June 30, 2018
107,520

 
$
14.80

 
2.54
 
$
3,397,202
Unvested RSAs outstanding
The following table summarizes information on unvested RSAs outstanding as of June 30, 2018:
 
Number of Shares
 
Weighted-Average
Grant Date Fair Value
Unvested RSAs at January 1, 2018
366,993

 
$
29.79

Granted
8,600

 
$
43.87

Vested
(98,021
)
 
$
22.99

Forfeited
(765
)
 
$
30.22

Unvested RSAs at June 30, 2018
276,807

 
$
32.64