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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of activity regarding active stock option and stock award plans | The following table shows the combined summary of activity regarding active stock option and stock award plans.
|  |  | Non-Vested Stock Awards Outstanding |  |
| Shares Available for Grant |  | Number of Shares |  | Weighted-Average Grant-Date Fair Value |  |  |  |
Balance, January 1, 2018 | 676,444 |  |  | 295,926 |  |  | $ | 27.41 |  |  |  |  |
Shares authorized - 2018 EIP | 70,461 |  |  | — |  |  | — |  |  |  |  |
Granted | (74,981) |  |  | 74,981 |  |  | 29.11 |  |  |  |  |
Stock awards vested | — |  |  | (106,513) |  |  | 25.79 |  |  |  |  |
Forfeited | 3,135 |  |  | (10,575) |  |  | 27.51 |  |  |  |  |
Balance, December 31, 2018 | 675,059 |  |  | 253,819 |  |  | 28.59 |  |  |  |  |
Shares authorized - 2019 EIP | 62,538 |  |  | — |  |  | — |  |  |  |  |
Granted | (74,336) |  |  | 74,336 |  |  | 31.44 |  |  |  |  |
Stock awards vested | — |  |  | (100,299) |  |  | 28.35 |  |  |  |  |
Forfeited | 1,241 |  |  | (8,865) |  |  | 30.28 |  |  |  |  |
Balance, December 31, 2019 | 664,502 |  |  | 218,991 |  |  | 29.60 |  |  |  |  |
Shares authorized - 2020 EIP | 60,233 |  |  | — |  |  | — |  |  |  |  |
Granted | (147,576) |  |  | 147,576 |  |  | 37.41 |  |  |  |  |
Stock awards vested | — |  |  | (74,203) |  |  | 28.95 |  |  |  |  |
Forfeited | 49 |  |  | (870) |  |  | 31.82 |  |  |  |  |
Balance, December 31, 2020 | 577,208 |  |  | 291,494 |  |  | $ | 33.71 |  |  |  |  |

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