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Net Income per Common Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Income per Common Share | Net Income per Common Share The calculation of net income per common share for the years ended December 31 was as follows:
(dollars and shares in thousands, except per share data) |  | 2020 |  | 2019 |  | 2018
Basic: |  |  |  |  |  |
Net income |  | $ | 132,217 |  |  | $ | 142,943 |  |  | $ | 152,276 |
Average common shares outstanding |  | 32,334 |  |  | 34,179 |  |  | 34,306 |
Basic net income per common share |  | $ | 4.09 |  |  | $ | 4.18 |  |  | $ | 4.44 |
Diluted: |  |  |  |  |  |
Net income |  | $ | 132,217 |  |  | $ | 142,943 |  |  | $ | 152,276 |
Average common shares outstanding |  | 32,334 |  |  | 34,179 |  |  | 34,306 |
Adjustment for common share equivalents |  | 28 |  |  | 32 |  |  | 137 |
Average common shares outstanding-diluted |  | 32,362 |  |  | 34,211 |  |  | 34,443 |
Diluted net income per common share |  | $ | 4.09 |  |  | $ | 4.18 |  |  | $ | 4.42 |
Anti-dilutive shares |  | 26 |  |  | 2 |  |  | — |

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