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PER SHARE DATA | 9 Months Ended
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Sep. 30, 2020
PER SHARE DATA |
PER SHARE DATA | 3. PER SHARE DATA Basic earnings per common share are calculated using the two-class method to determine income attributable to common shareholders. Unvested restricted stock awards that contain nonforfeitable rights to dividends are considered participating securities under the two-class method. Distributed dividends and an allocation of undistributed net income to participating securities reduce the amount of income attributable to common shareholders. Income attributable to common shareholders is then divided by weighted-average common shares outstanding for the period to determine basic earnings per common share. Diluted earnings per common share are calculated under the more dilutive of either the treasury method or the two-class method. Diluted earnings per common share is computed using weighted-average common shares outstanding, plus weighted-average common shares available from the exercise of all dilutive stock options, less the number of shares that could be repurchased with the proceeds of stock option exercises based on the average share price of the Corporation’s common stock during the period. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands, Except Share and Per Share Data) | ​ | Three Months Ended |  | Nine Months Ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
Basic | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 2,848 | ​ | $ | 5,307 | ​ | $ | 12,452 | ​ | $ | 14,046
Less: Dividends and undistributed earnings allocated to participating securities | ​ |  | (18) | ​ |  | (26) | ​ |  | (74) | ​ |  | (72)
Net income attributable to common shares | ​ | $ | 2,830 | ​ | $ | 5,281 | ​ | $ | 12,378 | ​ | $ | 13,974
Basic weighted-average common shares outstanding | ​ |  | 15,778,391 | ​ |  | 13,627,676 | ​ |  | 14,388,797 | ​ |  | 13,182,960
Basic earnings per common share (a) | ​ | $ | 0.18 | ​ | $ | 0.39 | ​ | $ | 0.86 | ​ | $ | 1.06
Diluted | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Net income attributable to common shares | ​ | $ | 2,830 | ​ | $ | 5,281 | ​ | $ | 12,378 | ​ | $ | 13,974
Basic weighted-average common shares outstanding | ​ |  | 15,778,391 | ​ |  | 13,627,676 | ​ |  | 14,388,797 | ​ |  | 13,182,960
Dilutive effect of potential common stock arising from stock options | ​ |  | 1,330 | ​ |  | 19,142 | ​ |  | 4,632 | ​ |  | 23,284
Diluted weighted-average common shares outstanding | ​ |  | 15,779,721 | ​ |  | 13,646,818 | ​ |  | 14,393,429 | ​ |  | 13,206,244
Diluted earnings per common share (a) | ​ | $ | 0.18 | ​ | $ | 0.39 | ​ | $ | 0.86 | ​ | $ | 1.06
Weighted-average nonvested restricted shares outstanding | ​ |  | 102,629 | ​ |  | 68,814 | ​ |  | 85,611 | ​ |  | 68,284
(a) | Basic and diluted earnings per share under the two-class method are determined on net income reported on the consolidated statements of income, less earnings allocated to non-vested restricted shares with nonforfeitable dividends (participating securities).
Anti-dilutive stock options are excluded from net income per share calculations. Weighted-average common shares available from anti-dilutive instruments totaled 39,012 shares in the three-month period ended September 30, 2020 and 19,506 shares in the nine-month period ended September 30, 2020. There were no anti-dilutive instruments in the three-month and nine-month periods ended September 30, 2019.

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