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EARNINGS PER SHARE | 3 Months Ended
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Mar. 31, 2022
EARNINGS PER SHARE |
EARNINGS PER SHARE | NOTE 4: EARNINGS PER SHARE ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended March 31,
​ | ​ | 2022 |  | 2021
​ | ​ | (In Thousands, Except Per Share Data)
Basic: | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ |  | 12,971 | ​ |  | 13,716
Net income and net income available to common stockholders |  | $ | 16,987 |  | $ | 18,868
Per common share amount |  | $ | 1.31 |  | $ | 1.38
​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted: | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ | ​ | 12,971 | ​ | ​ | 13,716
Net effect of dilutive stock options – based on the treasury stock method using average market price | ​ | ​ | 117 | ​ | ​ | 112
Diluted common shares | ​ | ​ | 13,088 | ​ | ​ | 13,828
Net income and net income available to common stockholders |  | $ | 16,987 |  | $ | 18,868
Per common share amount |  | $ | 1.30 |  | $ | 1.36
​ Options outstanding at March 31, 2022 and 2021, to purchase 376,237 and 352,488 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 March 31, 2022 and 2021, respectively.

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