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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2021
Summary of Significant Accounting Policies |
Summary of activity for restricted stock awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021 |
​ |  | ​ |  | Weighted- |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant Date |
​ | ​ | Shares | ​ | Fair Value |
Unvested, December 31, 2020 |  | 155,945 | ​ | $ | 48.52 | ​
Granted | ​ | 18,975 | ​ |  | 43.70 | ​
Vested |  | (16,105) | ​ |  | 43.05 | ​
Forfeited |  | (1,750) | ​ |  | 45.50 | ​
Unvested, March 31, 2021 |  | 157,065 | ​ | ​ | 48.53 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​
​ |  | ​ |  | Weighted- | ​
​ | ​ | ​ | ​ | Average | ​
​ | ​ | ​ | ​ | Grant Date | ​
​ | ​ | Shares | ​ | Fair Value | ​
Unvested, December 31, 2019 |  | 142,020 | ​ | $ | 48.88 | ​
Granted |  | 14,650 | ​ |  | 53.22 | ​
Vested |  | (16,230) | ​ |  | 39.97 | ​
Forfeited |  | (620) | ​ |  | 53.46 | ​
Unvested, March 31, 2020 |  | 139,820 | ​ | ​ | 50.39 | ​

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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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