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EARNINGS PER SHARE | 6 Months Ended
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Jun. 30, 2021
EARNINGS PER SHARE |
EARNINGS PER SHARE | NOTE 4: EARNINGS PER SHARE ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended June 30,
​ | ​ | 2021 |  | 2020
​ | ​ | (In Thousands, Except Per Share Data)
Basic: | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ |  | 13,710 | ​ |  | 14,084
Net income and net income available to common stockholders |  | $ | 20,114 |  | $ | 13,203
Per common share amount |  | $ | 1.47 |  | $ | 0.94
​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted: | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ | ​ | 13,710 | ​ | ​ | 14,084
Net effect of dilutive stock options – based on the treasury stock method using average market price | ​ | ​ | 102 | ​ | ​ | 40
Diluted common shares | ​ | ​ | 13,812 | ​ | ​ | 14,124
Net income and net income available to common stockholders |  | $ | 20,114 |  | $ | 13,203
Per common share amount |  | $ | 1.46 |  | $ | 0.93
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Six Months Ended June 30,
​ | ​ | 2021 |  | 2020
​ | ​ | (In Thousands, Except Per Share Data)
​ | ​ | ​ | ​ | ​ | ​ | ​
Basic: | ​ | ​ |  |  | ​ |
Average common shares outstanding | ​ | ​ | 13,713 |  | ​ | 14,153
Net income and net income available to common stockholders | ​ | $ | 38,982 | ​ | $ | 28,071
Per common share amount | ​ | $ | 2.84 | ​ | $ | 1.98
​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted: | ​ |  |  | ​ |  |
Average common shares outstanding | ​ |  | 13,713 | ​ |  | 14,153
Net effect of dilutive stock options – based on the treasury stock method using average market price | ​ |  | 94 | ​ |  | 56
Diluted common shares | ​ |  | 13,807 | ​ |  | 14,209
Net income and net income available to common stockholders | ​ | $ | 38,982 | ​ | $ | 28,071
Per common share amount | ​ | $ | 2.82 | ​ | $ | 1.98
​ Options outstanding at June 30, 2021 and 2020, to purchase 452,918 and 653,794 shares of common stock, respectively, were not included in the computation of diluted earnings per common share for each of the three month periods because the exercise prices of such options were greater than the average market prices of the common stock for the three months ended June 30, 2021 and 2020, respectively. Options outstanding at June 30, 2021 and 2020, to purchase 452,918 and 565,401 shares of common stock, respectively, were not included in the computation of diluted earnings per common share for the six month periods because the exercise prices of such options were greater than the average market prices of the common stock for the six months ended June 30, 2021 and 2020, respectively.

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