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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) | Total | Total SLM Corporation Equity | Preferred Stock | Treasury | Common Stock | Additional Paid-in Capital | Additional Paid-in Capital Navient’s Subsidiary Investment | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Non-controlling interest | Series A Preferred Stock | Series A Preferred Stock Total SLM Corporation Equity | Series A Preferred Stock Retained Earnings | Series B Preferred Stock | Series B Preferred Stock Total SLM Corporation Equity | Series B Preferred Stock Retained Earnings
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Beginning balance, shares issued (in shares) at Dec. 31, 2013 |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2013 |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2013 | $ 1,166,143,000 | $ 1,161,471,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 1,164,495,000 | $ (3,024,000) | $ 0 | $ 4,672,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 193,785,000 | 194,219,000 |  |  |  |  | 68,173,000 |  | 126,046,000 | (434,000) |  |  |  |  |  |
Other comprehensive loss, net of tax | (8,369,000) | (8,369,000) |  |  |  |  |  | (8,369,000) |  |  |  |  |  |  |  |
Total comprehensive income (loss) | 185,416,000 | 185,850,000 |  |  |  |  |  |  |  | (434,000) |  |  |  |  |  |
Net transfers from affiliate | 479,409,000 | 479,409,000 |  |  |  |  | 479,409,000 |  |  |  |  |  |  |  |  |
Separation adjustments related to Spin-Off of Navient Corporation (in shares) |  |  | 7,300,000 | 0 | 422,790,320 |  |  |  |  |  |  |  |  |  |  |
Separation adjustments related to Spin-Off of Navient Corporation | 0 |  | $ 565,000,000 |  | $ 84,558,000 | 1,062,519,000 | (1,712,077,000) |  |  |  |  |  |  |  |  |
Sale of non-controlling interest | (4,238,000) |  |  |  |  |  |  |  |  | (4,238,000) |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  | $ (7,667,000) | $ (7,667,000) | $ (7,667,000) | $ (5,266,000) | $ (5,266,000) | $ (5,266,000)
Dividend equivalent units related to employee stock-based compensation plans | $ 0 |  |  |  |  | 47,000 |  |  | (47,000) |  |  |  |  |  |  |
Issuance of common shares (in shares) | 2,013,805 |  |  |  | 2,013,805 |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares | $ 8,683,000 | 8,683,000 |  |  | $ 403,000 | 8,280,000 |  |  |  |  |  |  |  |  |  |
Tax benefit (deficiency) related to employee stock-based compensation | 3,271,000 | 3,271,000 |  |  |  | 3,271,000 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 16,394,000 | 16,394,000 |  |  |  | 16,394,000 |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  | (1,365,277) | (1,365,277) |  |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | (12,187,000) | (12,187,000) |  | $ (12,187,000) |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2014 |  |  | 7,300,000 |  | 424,804,125 |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2014 |  |  |  | (1,365,277) | 423,438,848 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2014 | 1,829,958,000 | 1,829,958,000 | $ 565,000,000 | $ (12,187,000) | $ 84,961,000 | 1,090,511,000 | $ 0 | (11,393,000) | 113,066,000 | $ 0 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 274,284,000 | 274,284,000 |  |  |  |  |  |  | 274,284,000 |  |  |  |  |  |  |
Other comprehensive loss, net of tax | (4,666,000) | (4,666,000) |  |  |  |  |  | (4,666,000) |  |  |  |  |  |  |  |
Total comprehensive income (loss) | 269,618,000 | 269,618,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net transfers from affiliate | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Separation adjustments related to Spin-Off of Navient Corporation |  | 1,660,000 |  |  |  | 1,660,000 |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  |  | (11,501,000) | (11,501,000) |  | (8,094,000) | (8,094,000)
Dividend equivalent units related to employee stock-based compensation plans |  | 0 |  |  |  | 1,146,000 |  |  | (1,146,000) |  |  |  |  |  |  |
Issuance of common shares (in shares) | 5,873,309 |  |  |  | 5,873,309 |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  | 15,980,000 |  |  | $ 1,175,000 | 14,805,000 |  |  |  |  |  |  |  |  |  |
Tax benefit (deficiency) related to employee stock-based compensation |  | 6,140,000 |  |  |  | 6,140,000 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 21,598,000 |  |  |  | 21,598,000 |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  | (3,008,913) | (3,008,913) |  |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  | (29,036,000) |  | $ (29,036,000) |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2015 |  |  | 7,300,000 |  | 430,677,434 |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2015 |  |  |  | (4,374,190) | 426,303,244 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2015 | $ 2,096,323,000 | 2,096,323,000 | $ 565,000,000 | $ (41,223,000) | $ 86,136,000 | 1,135,860,000 |  | (16,059,000) | 366,609,000 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 250,327,000 | 250,327,000 |  |  |  |  |  |  | 250,327,000 |  |  |  |  |  |  |
Other comprehensive loss, net of tax | 7,388,000 | 7,388,000 |  |  |  |  |  | 7,388,000 |  |  |  |  |  |  |  |
Total comprehensive income (loss) | $ 257,715,000 | 257,715,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  |  | $ (11,501,000) | $ (11,501,000) |  | $ (9,703,000) | $ (9,703,000)
Dividend equivalent units related to employee stock-based compensation plans |  | 0 |  |  |  | 410,000 |  |  | (410,000) |  |  |  |  |  |  |
Issuance of common shares (in shares) | 5,955,045 |  |  |  | 5,955,045 |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  | 19,191,000 |  |  | $ 1,191,000 | 18,000,000 |  |  |  |  |  |  |  |  |  |
Tax benefit (deficiency) related to employee stock-based compensation |  | (1,650,000) |  |  |  | (1,650,000) |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 22,944,000 |  |  |  | 22,944,000 |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  | (3,354,730) | (3,354,730) |  |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  | (26,261,000) |  | $ (26,261,000) |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2016 |  |  | 7,300,000 |  | 436,632,479 |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2016 |  |  |  | (7,728,920) | 428,903,559 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2016 | $ 2,347,058,000 | $ 2,347,058,000 | $ 565,000,000 | $ (67,484,000) | $ 87,327,000 | $ 1,175,564,000 |  | $ (8,671,000) | $ 595,322,000 |  |  |  |  |  |  |

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