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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 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 an expense and the income tax benefit of such awards. The income tax benefit decrease for the year ended December 31, 2018 was due to the reduction of the corporate federal income tax rate from 35 percent to 21 percent as a result of the Tax Cuts and Jobs Act, which was effective January 1, 2018. The income tax benefit increase for the year ended December 31, 2017 was 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 $644,000 and $935,000 of income tax benefit for the years ended December 31, 2018 and 2017, respectively.
 
Years Ended December 31,
 
2018
 
2017
 
2016
Stock and ESPP Options
 
 
 
 
 
Pre-tax compensation expense
$
109

 
$
121

 
$
76

Income tax expense (benefit)
(97
)
 
(322
)
 
18

Stock and ESPP option expense, net of income taxes
$
12

 
$
(201
)
 
$
94

Restricted Stock Awards
 
 
 
 
 
Pre-tax compensation expense
$
3,483

 
$
2,706

 
$
2,524

Income tax benefit
(1,179
)
 
(1,561
)
 
(883
)
Restricted stock awards expense, net of income taxes
$
2,304

 
$
1,145

 
$
1,641

Total Share-Based Compensation:
 
 
 
 
 
Pre-tax compensation expense
$
3,592

 
$
2,827

 
$
2,600

Income tax benefit
(1,276
)
 
(1,883
)
 
(865
)
Total share-based compensation expense, net of income taxes
$
2,316

 
$
944

 
$
1,735
Stock Option Activity Under Stock Option Plans
Stock option activity under the Corporation's stock option plans, as of December 31, 2018, and changes during the year ended December 31, 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
(76,152
)
 
$
20.99

 

 

Canceled
(200
)
 
$
28.25

 
 
 
 
Outstanding December 31, 2018
76,300

 
$
12.40

 
2.86
 
$
1,668,871

Vested and Expected to Vest at December 31, 2018
76,300

 
$
12.40

 
2.86
 
$
1,668,871

Exercisable at December 31, 2018
76,300

 
$
12.40

 
2.86
 
$
1,668,871
Summary of Unvested RSAs Outstanding
The following table summarizes information on unvested RSAs outstanding as of December 31, 2018:
 
Number of
Shares
 
Weighted-Average
Grant Date Fair Value
Unvested RSAs at January 1, 2018
366,993

 
$
29.79

Granted
105,100

 
$
48.11

Forfeited
(15,198
)
 
$
42.00

Vested
(112,533
)
 
$
23.84

Unvested RSAs at December 31, 2018
344,362

 
$
36.80