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Share-Based Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Plans |
Summary of activity for restricted stock awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022 | ​ | 2021 |
​ |  | ​ |  | 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 |  | 145,677 | ​ | $ | 48.88 |  | 140,577 | ​ | $ | 48.57 |  | 155,945 | ​ | $ | 48.52 | ​
Granted | ​ | 36,945 | ​ |  | 62.87 |  | 36,435 | ​ |  | 54.18 |  | 41,912 | ​ |  | 47.83 | ​
Vested |  | (43,383) | ​ |  | 50.59 |  | (26,200) | ​ |  | 54.73 |  | (51,305) | ​ |  | 48.11 | ​
Cancelled |  | (3,545) | ​ |  | 49.37 |  | (5,135) | ​ |  | 48.28 |  | (5,975) | ​ |  | 45.87 | ​
Nonvested at end of year |  | 135,694 | ​ | ​ | 52.13 |  | 145,677 | ​ | ​ | 48.88 |  | 140,577 | ​ | ​ | 48.57 | ​

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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 -Name Accounting Standards Codification -Section 50 -Subparagraph (c) -Paragraph 2 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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