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Share-Based Compensation Plan (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-Based Compensation Plan |
Schedule of stock plan activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, 2020 | ​ | Year ended December 31, 2019
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | Weighted-
​ | ​ | ​ |  | Average Grant | ​ | ​ | ​ | Average Grant
​ |  | Awards |  | Date Fair Value |  | Awards |  | Date Fair Value
Restricted Stock and Restricted Stock Unit Awards |  | ​ |  | ​ | ​ | ​ | ​ |  | ​ | ​
Outstanding at beginning of period |  | 347,211 |  | $ | 18.64 | ​ | 337,014 |  | $ | 18.36
Granted |  | 82,494 |  | ​ | 19.62 | ​ | 70,617 |  | ​ | 19.87
Vested |  | (91,346) |  | ​ | 16.39 | ​ | (53,994) |  | ​ | 18.76
Forfeited or cancelled |  | (13,329) |  | ​ | 19.62 | ​ | (6,426) |  | ​ | 17.63
Outstanding at end of period | ​ | 325,030 | ​ | $ | 19.48 | ​ | 347,211 | ​ | $ | 18.64
Share-based Retainer plan | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Number of Shares
​ |  | Available for |  | Restricted
​ | ​ | future | ​ | stock
​ | ​ | grant | ​ | awards
Balance as of December 31, 2018 | ​ | 25,825 | ​ | 154,175
Retainer shares awarded | ​ | (13,144) |  | 13,144
Plan expiration | ​ | (12,681) |  | —
Balance as of December 31, 2019 | ​ | — | ​ | 167,319
Retainer shares awarded | ​ | — | ​ | —
Balance as of December 31, 2020 | ​ | — | ​ | 167,319

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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