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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 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 | ​ | 20,462 | ​ |  | 44.13 | ​
Vested |  | (21,195) | ​ |  | 44.18 | ​
Forfeited |  | (5,450) | ​ |  | 45.89 | ​
Unvested, September 30, 2021 |  | 149,762 | ​ | ​ | 48.63 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​
​ |  | ​ |  | Weighted- | ​
​ | ​ | ​ | ​ | Average | ​
​ | ​ | ​ | ​ | Grant Date | ​
​ | ​ | Shares | ​ | Fair Value | ​
Unvested, December 31, 2019 |  | 142,020 | ​ | $ | 48.88 | ​
Granted |  | 14,770 | ​ |  | 53.03 | ​
Vested |  | (16,555) | ​ |  | 40.20 | ​
Forfeited |  | (3,530) | ​ |  | 52.86 | ​
Unvested, September 30, 2020 |  | 136,705 | ​ | ​ | 50.32 | ​

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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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