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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Common Share |
Schedule of computation of basic and diluted earnings per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31,
(Dollars and shares in thousands, except for per share amounts) |  | ​ | 2019 | ​ | 2018 | ​ | 2017
Basic earnings per common share: | ​ |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | ​ | $ | 186,483 | ​ | $ | 178,871 | ​ | $ | 87,554
Weighted-average basic common shares | ​ | ​ | ​ | 34,561 | ​ | ​ | 36,530 | ​ | ​ | 29,686
Basic earnings per common share | ​ | ​ | $ | 5.40 | ​ | $ | 4.90 | ​ | $ | 2.95
Diluted earnings per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | ​ | $ | 186,483 | ​ | $ | 178,871 | ​ | $ | 87,554
Weighted-average basic common shares | ​ | ​ | ​ | 34,561 | ​ | ​ | 36,530 | ​ | ​ | 29,686
Effect of dilutive securities | ​ | ​ | ​ | 236 | ​ | ​ | 246 | ​ | ​ | 236
Weighted-average dilutive shares | ​ | ​ | ​ | 34,797 | ​ | ​ | 36,776 | ​ | ​ | 29,922
Diluted earnings per common share | ​ | ​ | $ | 5.36 | ​ | $ | 4.86 | ​ | $ | 2.93
Schedule of anti-dilutive securities excluded from computation of diluted earnings per common share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, |
(Dollars in thousands) |  | ​ | 2019 | ​ | 2018 | ​ | 2017 |
Number of shares | ​ |  | ​ | ​ | ​ | ​ | 62,235 |  | ​ | ​ |  | ​ | 62,235 |  | ​ | ​ | ​ | ​ | 34,712 |
Range of exercise prices | ​ | ​ | $ | 87.30 | to | $ | 91.35 | ​ | $ | 87.30 | to | $ | 91.35 | ​ | $ | 69.48 | to | $ | 91.35 | ​

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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