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Earnings per Common Share | 3 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Earnings per Common Share | Earnings per Common Share Basic earnings per common share (“EPS”) are calculated using the weighted average number of shares of common stock outstanding during each period. The determination of the weighted-average shares and diluted potential common shares for the March 31, 2014 period is based on the activity at pre-Spin-Off SLM. 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) |  | 2015 |  | 2014
Numerator: |  |  |  |
Net income attributable to SLM Corporation |  | $ | 47,699 |  |  | $ | 47,448 |
Preferred stock dividends |  | 4,823 |  |  | — |
Net income attributable to SLM Corporation common stock |  | $ | 42,876 |  |  | $ | 47,448 |
Denominator: |  |  |  |
Weighted average shares used to compute basic EPS |  | 424,428 |  |  | 426,717 |
Effect of dilutive securities: |  |  |  |
Dilutive effect of stock options, restricted stock and restricted stock units and Employee Stock Purchase Plan ("ESPP") (1)(2) |  | 7,874 |  |  | 7,933 |
Weighted average shares used to compute diluted EPS |  | 432,302 |  |  | 434,650 |
Basic earnings per common share attributable to SLM Corporation |  | $ | 0.10 |  |  | $ | 0.11 |
Diluted earnings per common share attributable to SLM Corporation |  | $ | 0.10 |  |  | $ | 0.11 |
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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, 2015 and 2014, securities covering approximately 2 million and 3 million 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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