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Net Income per Common Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Net Income per Common Share | Note 10. Net Income per Common Share The calculation of net income per common share for the three and nine months ended September 30, 2020 and 2019 (unaudited) was as follows: ​
​ |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(dollars and shares in thousands, except per share data) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Basic: |  |  |  |  |  |  |  |
Net income |  | $ | 41,346 |  |  | $ | 36,495 |  |  | $ | 93,325 |  |  | $ | 107,487 |
Average common shares outstanding |  | 32,229 |  |  | 34,233 |  |  | 32,434 |  |  | 34,418 |
Basic net income per common share |  | $ | 1.28 |  |  | $ | 1.07 |  |  | $ | 2.88 |  |  | $ | 3.12 |
​ |  | ​ |  | ​ |  | ​ |  | ​
Diluted: |  |  |  | ​ |  | ​ |  | ​
Net income |  | $ | 41,346 |  |  | $ | 36,495 |  |  | $ | 93,325 |  |  | $ | 107,487 |
Average common shares outstanding |  | 32,229 |  |  | 34,233 |  |  | 32,434 |  |  | 34,418 |
Adjustment for common share equivalents |  | 22 |  |  | 23 |  |  | 24 |  |  | 33 |
Average common shares outstanding-diluted |  | 32,251 |  |  | 34,256 |  |  | 32,458 |  |  | 34,451 |
Diluted net income per common share |  | $ | 1.28 |  |  | $ | 1.07 |  |  | $ | 2.88 |  |  | $ | 3.12 |
​ |  | ​ |  | ​ |  | ​ |  | ​
Anti-dilutive shares |  | 26 |  |  | 2 |  |  | 26 |  |  | 20 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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