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Earnings per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Schedule of earnings per share, basic and diluted | A reconciliation of the numerators and denominators of the basic and diluted EPS calculations follows.
|  | Three Months Ended |
|  | March 31, |
(In thousands, except per share data) |  | 2018 |  | 2017 |
Numerator: |  |  |  |  |
Net income |  | $ | 126,254 |  |  | $ | 94,943 |  |
Preferred stock dividends |  | 3,397 |  |  | 5,575 |  |
Net income attributable to SLM Corporation common stock |  | $ | 122,857 |  |  | $ | 89,368 |  |
Denominator: |  |  |  |  |
Weighted average shares used to compute basic EPS |  | 433,952 |  |  | 429,891 |  |
Effect of dilutive securities: |  |  |  |  |
Dilutive effect of stock options, restricted stock, restricted stock units and Employee Stock Purchase Plan (“ESPP”) (1)(2) |  | 5,025 |  |  | 8,844 |  |
Weighted average shares used to compute diluted EPS |  | 438,977 |  |  | 438,735 |  |
Basic earnings per common share attributable to SLM Corporation |  | $ | 0.28 |  |  | $ | 0.21 |  |
Diluted earnings per common share attributable to SLM Corporation |  | $ | 0.28 |  |  | $ | 0.20 |  |
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(1) | Includes the potential dilutive effect of additional common shares that are issuable upon exercise of outstanding stock options, restricted stock, restricted stock units, and the outstanding commitment to issue shares under the ESPP, determined by the treasury stock method.
(2) | For the three months ended March 31, 2018 and 2017, securities covering approximately 0 and 0 shares, respectively, were outstanding but not included in the computation of diluted earnings per share because they were anti-dilutive.

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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/2003/role/presentationRef -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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