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Share-Based Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-Based Plans |
Summary of activity for restricted stock awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
​ |  | ​ |  | Weighted- |  | ​ |  | Weighted- |  | ​ |  | Weighted- |
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date |
​ | ​ | Shares | ​ | Fair Value | ​ | Shares | ​ | Fair Value | ​ | Shares | ​ | Fair Value |
Nonvested at beginning of year |  | 142,020 | ​ | $ | 48.88 |  | 139,455 | ​ | $ | 45.75 |  | 137,880 | ​ | $ | 43.52 | ​
Granted | ​ | 47,385 | ​ |  | 42.01 |  | 36,115 | ​ |  | 53.75 |  | 30,185 | ​ |  | 52.82 | ​
Vested |  | (30,550) | ​ |  | 39.84 |  | (32,155) | ​ |  | 40.69 |  | (26,450) | ​ |  | 42.41 | ​
Cancelled |  | (2,910) | ​ |  | 53.46 |  | (1,395) | ​ |  | 51.05 |  | (2,160) | ​ |  | 42.54 | ​
Nonvested at end of year |  | 155,945 | ​ | ​ | 48.52 |  | 142,020 | ​ | ​ | 48.88 |  | 139,455 | ​ | ​ | 45.75 | ​

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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