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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2021
EARNINGS PER SHARE |
EARNINGS PER SHARE | NOTE 4: EARNINGS PER SHARE ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 30,
​ | ​ | 2021 |  | 2020
​ | ​ | (In Thousands, Except Per Share Data)
Basic: | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ |  | 13,534 | ​ |  | 14,053
Net income and net income available to common stockholders |  | $ | 20,364 |  | $ | 13,454
Per common share amount |  | $ | 1.50 |  | $ | 0.96
​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted: | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ | ​ | 13,534 | ​ | ​ | 14,053
Net effect of dilutive stock options – based on the treasury stock method using average market price | ​ | ​ | 92 | ​ | ​ | 32
Diluted common shares | ​ | ​ | 13,626 | ​ | ​ | 14,085
Net income and net income available to common stockholders |  | $ | 20,364 |  | $ | 13,454
Per common share amount |  | $ | 1.49 |  | $ | 0.96
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Nine Months Ended September 30,
​ | ​ | 2021 |  | 2020
​ | ​ | (In Thousands, Except Per Share Data)
Basic: | ​ | ​ |  |  | ​ |
Average common shares outstanding | ​ | ​ | 13,652 |  | ​ | 14,119
Net income and net income available to common stockholders | ​ | $ | 59,346 | ​ | $ | 41,525
Per common share amount | ​ | $ | 4.35 | ​ | $ | 2.94
​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted: | ​ |  |  | ​ |  |
Average common shares outstanding | ​ |  | 13,652 | ​ |  | 14,119
Net effect of dilutive stock options – based on the treasury stock method using average market price | ​ |  | 92 | ​ |  | 46
Diluted common shares | ​ |  | 13,744 | ​ |  | 14,165
Net income and net income available to common stockholders | ​ | $ | 59,346 | ​ | $ | 41,525
Per common share amount | ​ | $ | 4.32 | ​ | $ | 2.93
​ Options outstanding at September 30, 2021 and 2020, to purchase 448,256 and 654,369 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 September 30, 2021 and 2020, respectively. Options outstanding at September 30, 2021 and 2020, to purchase 448,256 and 650,869 shares of common stock, respectively, were not included in the computation of diluted earnings per common share for the nine month periods because the exercise prices of such options were greater than the average market prices of the common stock for the nine months ended September 30, 2021 and 2020, respectively.

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