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Stock Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Compensation Cost, Net of Forfeitures, Related to Stock-based Compensation | The following table summarizes the compensation cost, net of forfeitures, related to stock-based compensation for the years ended December 31, 2020, 2019 and 2018 (in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
Stock and stock unit awards: |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax compensation expense |  | $ | 774 |  |  | $ | 453 |  |  | $ | 314 |
Income tax benefit |  |  | (163 | ) |  |  | (95 | ) |  |  | (66 | )
Total share-based compensation expense, net of income taxes |  | $ | 611 |  |  | $ | 358 |  |  | $ | 248 |
Summary of Stock Option Activity | A summary of option activity under the 1997 Stock Incentive Plan as of December 31, 2018, and changes during the years then ended is presented below:
|  | 2018 |
|  |  |  |  |  |  |  |  |  | Weighted- |  |  |  |  |
|  |  |  |  |  | Weighted- |  |  | Average |  |  | Aggregate |
|  |  |  |  |  | Average |  |  | Remaining |  |  | Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Contractual Term |  |  | Value |
Outstanding, beginning of year |  |  | 10,500 |  |  | $ | 23.00 |  |  |  |  |  |  |  |  |
Granted |  |  | 0 |  |  |  | 0.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | (10,500 | ) |  |  | 23.00 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | 0 |  |  |  | 0.00 |  |  |  |  |  |  |  |  |
Outstanding, end of year |  |  | 0 |  |  | $ | 0.00 |  |  |  | 0.00 |  |  | $ | — |
Exercisable, end of year |  |  | 0 |  |  | $ | 0.00 |  |  |  | 0.00 |  |  | $ | — |
The total intrinsic value of options exercised during 2018 was $176,000. There were no stock options for shares of common stock not considered in computing the aggregate intrinsic value of outstanding shares and exercisable shares for 2018 because they were anti-dilutive. There were no stock options remaining after 2018.
Summary of Unvested Stock and Stock Units | The following table summarizes non-vested stock and stock unit activity for the years ended December 31, 2020, 2019 and 2018:
|  | 2020 |  |  | 2019 |  |  | 2018 |  |  |  |  |
|  |  |  |  |  | Weighted-avg |  |  |  |  |  |  | Weighted-avg |  |  |  |  |  |  | Weighted-avg |
|  |  |  |  |  | Grant-date |  |  |  |  |  |  | Grant-date |  |  |  |  |  |  | Grant-date |
|  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |
Nonvested, beginning of year |  |  | 37,908 |  |  | $ | 35.49 |  |  |  | 24,280 |  |  | $ | 38.92 |  |  |  | 0 |  |  | $ | 0.00 |
Granted |  |  | 25,950 |  |  |  | 34.46 |  |  |  | 26,700 |  |  |  | 33.31 |  |  |  | 28,700 |  |  |  | 38.92 |
Vested |  |  | (21,305 | ) |  |  | 35.99 |  |  |  | (13,072 | ) |  |  | 37.42 |  |  |  | (4,420 | ) |  |  | 38.92 |
Forfeited |  |  | (333 | ) |  |  | (33.31 | ) |  |  | 0 |  |  |  | 0.00 |  |  |  | 0 |  |  |  | 0.00 |
Nonvested, end of year |  |  | 42,220 |  |  | $ | 34.62 |  |  |  | 37,908 |  |  | $ | 35.49 |  |  |  | 24,280 |  |  | $ | 38.92 |
Fair value of shares vested |  |  |  |  |  | $ | 766,774 |  |  |  |  |  |  | $ | 489,110 |  |  |  |  |  |  | $ | 172,026 |

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