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v3.21.1

Share-Based Compensation Plan (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-Based Compensation Plan |
Schedule of stock plan activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended March 31, 2021 | ​ | Three months ended March 31, 2020
​ | ​ | ​ | ​ | 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 |  | 325,030 |  | $ | 19.48 | ​ | 347,211 |  | $ | 18.64
Granted |  | 59,374 |  | ​ | 26.36 | ​ | 63,048 |  | ​ | 20.23
Vested |  | (81,092) |  | ​ | 20.72 | ​ | (71,339) |  | ​ | 16.06
Forfeited or cancelled |  | — |  | ​ | — | ​ | (5,068) |  | ​ | 19.37
Outstanding at end of period | ​ | 303,312 | ​ | $ | 20.49 | ​ | 333,852 | ​ | $ | 19.47

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, 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 (d) -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 (e) -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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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