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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(in thousands, except per share and share data) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Net income | ​ | $ | 8,402 | ​ | $ | 5,015 | ​ | $ | 24,604 | ​ | $ | 18,413
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Average number of basic common shares outstanding | ​ |  | 15,079,413 | ​ |  | 15,547,276 | ​ |  | 15,358,803 | ​ |  | 15,536,414
Plus: dilutive effect of stock options and awards outstanding(1) | ​ |  | 23,421 | ​ |  | 34,027 | ​ |  | 23,063 | ​ |  | 45,282
Average number of diluted common shares outstanding | ​ |  | 15,102,834 | ​ |  | 15,581,303 | ​ |  | 15,381,866 | ​ |  | 15,581,696
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings per share: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Basic | ​ | $ | 0.56 | ​ | $ | 0.32 | ​ | $ | 1.60 | ​ | $ | 1.19
Diluted | ​ | $ | 0.56 | ​ | $ | 0.32 | ​ | $ | 1.60 | ​ | $ | 1.18
(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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