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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [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. On January 1, 2017, the implementation of ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting required the 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 resulted in approximately $433,000, $644,000 and $935,000 of income tax benefit for the years ended December 31, 2019, 2018 and 2017, respectively.
 
Years Ended December 31,
 
2019
 
2018
 
2017
Stock and ESPP Options
 
 
 
 
 
Pre-tax compensation expense
$
101

 
$
109

 
$
121

Income tax expense (benefit)
(70
)
 
(97
)
 
(322
)
Stock and ESPP option expense, net of income taxes
$
31

 
$
12

 
$
(201
)
Restricted Stock Awards
 
 
 
 
 
Pre-tax compensation expense
$
4,014

 
$
3,483

 
$
2,706

Income tax benefit
(1,206
)
 
(1,179
)
 
(1,561
)
Restricted stock awards expense, net of income taxes
$
2,808

 
$
2,304

 
$
1,145

Total Share-Based Compensation:
 
 
 
 
 
Pre-tax compensation expense
$
4,115

 
$
3,592

 
$
2,827

Income tax benefit
(1,276
)
 
(1,276
)
 
(1,883
)
Total share-based compensation expense, net of income taxes
$
2,839

 
$
2,316

 
$
944
Stock Option Activity Under Stock Option Plans
Stock option activity under the Corporation's stock option plans, as of December 31, 2019, and changes during the year ended December 31, 2019, were as follows:
 
Number of
Shares
 
Weighted-Average
Exercise Price
 
Weighted Average
Remaining Contractual
Term (in Years)
 
Aggregate
Intrinsic Value
Outstanding at January 1, 2019
76,300

 
$
12.40

 
—

 
$
—

Exercised
(16,950
)
 
$
8.51

 
—

 
$
—

Outstanding December 31, 2019
59,350

 
$
13.51

 
2.45

 
$
1,666,694

Vested and Expected to Vest at December 31, 2019
59,350

 
$
13.51

 
2.45

 
$
1,666,694

Exercisable at December 31, 2019
59,350

 
$
13.51

 
2.45

 
$
1,666,694
Summary of Unvested RSAs Outstanding
The following table summarizes information on unvested RSAs outstanding as of December 31, 2019:
 
Number of
Shares
 
Weighted-Average
Grant Date Fair Value
Unvested RSAs at January 1, 2019
344,362

 
$
36.80

Granted
125,846

 
$
35.84

Forfeited
(2,588
)
 
$
40.53

Vested
(116,572
)
 
$
24.03

Unvested RSAs at December 31, 2019
351,048

 
$
40.67