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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock-based Compensation |
Schedule of status of and changes in the Company's stock option awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​
​ | ​ | ​ |  |  | Weighted- | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ |  | Shares |  | Price |  | Life |  | Value
Outstanding at beginning of year | ​ | ​ | 53,185 | ​ | $ | 22.00 | ​ | ​ | 5.90 | ​ | $ | 292
Exercised | ​ | ​ | (12,956) | ​ | ​ | 17.45 | ​ | ​ | ​ | ​ | ​ | ​
Forfeited | ​ | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Expired | ​ | ​ | (1,144) | ​ |  | 21.35 | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at end of year | ​ | ​ | 39,085 | ​ | $ | 23.53 | ​ | ​ | 5.88 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at end of year | ​ | ​ | 39,085 | ​ | $ | 23.53 | ​ | ​ | 5.88 | ​ | $ | —
Summary of the changes in company restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020
​ | ​ | ​ |  |  | Weighted-
​ | ​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value
Non-vested at beginning of year | ​ | ​ | 778,317 | ​ | $ | 27.27
Granted | ​ | ​ | 385,893 | ​ |  | 17.26
Dividend equivalents earned | ​ | ​ | 41,592 | ​ |  | 18.85
Vested | ​ | ​ | (117,641) | ​ |  | 21.38
Forfeited | ​ | ​ | (71,123) | ​ |  | 26.34
Non-vested at end of year | ​ | ​ | 1,017,038 | ​ | $ | 23.87
Summary of the changes in company deferred stock units | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020
​ | ​ |  |  |  | Weighted-
​ | ​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value
Non-vested at beginning of year | ​ |  | 21,261 | ​ | $ | 26.78
Granted | ​ |  | 33,419 | ​ |  | 17.17
Dividend equivalents earned | ​ |  | 4,507 | ​ |  | 18.97
Vested | ​ |  | (24,924) | ​ |  | 25.68
Forfeited | ​ | ​ | — | ​ | ​ | —
Non-vested at end of year | ​ |  | 34,263 | ​ | $ | 17.18
​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at end of year | ​ |  | 71,044 | ​ | $ | 24.34

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