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EARNINGS PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(in thousands, except per share and share data) |  | 2021 |  | 2020
Net income | ​ | $ | 9,480 | ​ | $ | 7,721
​ | ​ | ​ | ​ | ​ | ​ | ​
Average number of basic common shares outstanding | ​ |  | 14,933,554 | ​ |  | 15,558,132
Plus: dilutive effect of stock options and awards outstanding | ​ |  | 73,161 | ​ |  | 34,463
Average number of diluted common shares outstanding(1) | ​ |  | 15,006,715 | ​ |  | 15,592,595
​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings per share: | ​ |  |  | ​ |  |
Basic | ​ | $ | 0.63 | ​ | $ | 0.50
Diluted | ​ | $ | 0.63 | ​ | $ | 0.50
(1) | Average diluted shares outstanding are computed using the treasury stock method.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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