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Share-Based Compensation (Tables) | 12 Months Ended
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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 |

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