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Earnings Per Common Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Common Share |
Earnings Per Common Share | ​ Note 15—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) |  | ​ | 2020 | ​ | 2019 | ​ | 2018
Basic earnings per common share: | ​ |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | ​ | $ | 120,632 | ​ | $ | 186,483 | ​ | $ | 178,871
Weighted-average basic common shares | ​ | ​ | ​ | 54,756 | ​ | ​ | 34,561 | ​ | ​ | 36,530
Basic earnings per common share | ​ | ​ | $ | 2.20 | ​ | $ | 5.40 | ​ | $ | 4.90
Basic earnings per common share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | ​ | $ | 120,632 | ​ | $ | 186,483 | ​ | $ | 178,871
Weighted-average basic common shares | ​ | ​ | ​ | 54,756 | ​ | ​ | 34,561 | ​ | ​ | 36,530
Effect of dilutive securities | ​ | ​ | ​ | 307 | ​ | ​ | 236 | ​ | ​ | 246
Weighted-average dilutive shares | ​ | ​ | ​ | 55,063 | ​ | ​ | 34,797 | ​ | ​ | 36,776
Basic earnings per common share | ​ | ​ | $ | 2.19 | ​ | $ | 5.36 | ​ | $ | 4.86
​ 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, |
(Dollars in thousands) |  | ​ | 2020 | ​ | 2019 | ​ | 2018 |
Number of shares | ​ |  | ​ | ​ | ​ | ​ | 136,844 |  | ​ | ​ |  | ​ | 62,235 |  | ​ | ​ | ​ | ​ | 62,235 |
Range of exercise prices | ​ | ​ | $ | 61.42 | to | $ | 91.35 | ​ | $ | 87.30 | to | $ | 91.35 | ​ | $ | 87.30 | to | $ | 91.35 | ​
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