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Net Income per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule of calculation of 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) |  | 2021 |  | 2020 |  | 2019
Basic: |  |  |  |  |  |
Net income |  | $ | 176,691 |  |  | $ | 132,217 |  |  | $ | 142,943 |
Average common shares outstanding |  | 31,936 |  |  | 32,334 |  |  | 34,179 |
Basic net income per common share |  | $ | 5.53 |  |  | $ | 4.09 |  |  | $ | 4.18 |
Diluted: |  |  |  |  |  |
Net income |  | $ | 176,691 |  |  | $ | 132,217 |  |  | $ | 142,943 |
Average common shares outstanding |  | 31,936 |  |  | 32,334 |  |  | 34,179 |
Adjustment for common share equivalents |  | 67 |  |  | 28 |  |  | 32 |
Average common shares outstanding-diluted |  | 32,003 |  |  | 32,362 |  |  | 34,211 |
Diluted net income per common share |  | $ | 5.52 |  |  | $ | 4.09 |  |  | $ | 4.18 |
Anti-dilutive shares |  | 3 |  |  | 26 |  |  | 2 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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