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Earnings Per Common Share and Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Earnings Per Common Share, Basic and Diluted | The following table sets forth the computation of earnings per common share and earnings per common share - assuming dilution:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
|  |  |  |  | (Dollars in thousands, except per share data)
Numerator: |  |  |  |  |  |  |
Net income available to common stockholders - numerator for earnings per common share |  |  |  |  | $ | 271,765 |  |  | $ | 236,336 |
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  |  |  | 95,734,851 |  |  | 91,644,315 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options and deferred compensation agreements |  |  |  |  | 181,054 |  |  | 137,289 |
Restricted stock and restricted stock units |  |  |  |  | 299,760 |  |  | 239,475 |
Denominator for earnings per common share - assuming dilution |  |  |  |  | 96,215,665 |  |  | 92,021,079 |
Earnings per common share |  |  |  |  | $ | 2.84 |  |  | $ | 2.58 |
Earnings per common share - assuming dilution |  |  |  |  | $ | 2.82 |  |  | $ | 2.57 |

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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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