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EARNINGS PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2021
EARNINGS PER SHARE |
Schedule of Earnings Per Share, Basic and Diluted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended March 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | (In Thousands, Except Per Share Data)
Basic: | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ |  | 13,716 | ​ |  | 14,221
Net income and net income available to common stockholders |  | $ | 18,868 |  | $ | 14,868
Per common share amount |  | $ | 1.38 |  | $ | 1.05
​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted: | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ | ​ | 13,716 | ​ | ​ | 14,221
Net effect of dilutive stock options – based on the treasury stock method using average market price | ​ | ​ | 112 | ​ | ​ | 78
Diluted common shares | ​ | ​ | 13,828 | ​ | ​ | 14,299
Net income and net income available to common stockholders |  | $ | 18,868 |  | $ | 14,868
Per common share amount |  | $ | 1.36 |  | $ | 1.04

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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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