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Earnings Per Common Share | 12 Months Ended
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Dec. 31, 2023
Earnings Per Common Share |
Earnings Per Common Share | Note 14—Earnings Per Common Share The following table sets forth the computation of basic and diluted earnings per common share: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(Dollars and shares in thousands, except for per share amounts) |  | 2023 | ​ | 2022 | ​ | 2021
Basic earnings per common share: | ​ | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 494,308 | ​ | $ | 496,049 | ​ | $ | 475,543
Weighted-average basic common shares | ​ | ​ | 76,051 | ​ | ​ | 74,551 | ​ | ​ | 70,393
Basic earnings per common share | ​ | $ | 6.50 | ​ | $ | 6.65 | ​ | $ | 6.76
Diluted earnings per common share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 494,308 | ​ | $ | 496,049 | ​ | $ | 475,543
Weighted-average basic common shares | ​ | ​ | 76,051 | ​ | ​ | 74,551 | ​ | ​ | 70,393
Effect of dilutive securities | ​ | ​ | 429 | ​ | ​ | 630 | ​ | ​ | 496
Weighted-average dilutive shares | ​ | ​ | 76,480 | ​ | ​ | 75,181 | ​ | ​ | 70,889
Diluted earnings per common share | ​ | $ | 6.46 | ​ | $ | 6.60 | ​ | $ | 6.71
​ The calculation of diluted earnings per common share excludes outstanding stock options for which the results would have been antidilutive under the treasury stock method as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ | ​ | 2023 | ​ | 2022 | ​ | 2021 |
Number of shares |  | ​ | ​ | ​ | ​ | 57,169 |  | ​ | ​ | ​ | ​ | 57,169 |  | ​ | ​ | ​ | ​ | 57,169 |
Range of exercise prices | ​ | $ | 87.30 | to | $ | 91.35 | ​ | $ | 87.30 | to | $ | 91.35 | ​ | $ | 87.30 | to | $ | 91.35 | ​
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