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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Total SLM Corporation Equity | Redemption of Series A Preferred Stock | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Series A Preferred Stock | Series A Preferred Stock Total SLM Corporation Equity | Series A Preferred Stock Redemption of Series A Preferred Stock | Series A Preferred Stock Retained Earnings | 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, 2015 |  |  | 7,300,000 | 430,677,434 |  |  |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2015 |  |  |  | 426,303,244 | (4,374,190) |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2015 |  | $ 2,096,323 | $ 565,000 | $ 86,136 | $ (41,223) | $ 1,135,860 | $ (16,059) | $ 366,609 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 250,327 | 250,327 |  |  |  |  |  | 250,327 |  |  |  |  |  |
Other comprehensive income, net of tax | 7,388 | 7,388 |  |  |  |  | 7,388 |  |  |  |  |  |  |
Total comprehensive income | $ 257,715 | 257,715 |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, series B ($3.91 per share) |  |  |  |  |  |  |  |  |  | $ (11,501) |  | $ (11,501) | $ (9,703) | $ (9,703)
Redemption of Series A Preferred Stock | (3,354,730) |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend equivalent units related to employee stock-based compensation plans |  | 0 |  |  |  | 410 |  | (410) |  |  |  |  |  |
Issuance of common shares (in shares) | 5,955,045 |  |  | 5,955,045 |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  | 19,191 |  | $ 1,191 |  | 18,000 |  |  |  |  |  |  |  |
Tax benefit related to employee stock-based compensation |  | (1,650) |  |  |  | (1,650) |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 22,944 |  |  |  | 22,944 |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  |  |  | (3,354,730) | (3,354,730) |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  | (26,261) |  |  | $ (26,261) |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2016 |  |  | 7,300,000 | 436,632,479 |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2016 |  |  |  | 428,903,559 | (7,728,920) |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2016 |  | 2,347,058 | $ 565,000 | $ 87,327 | $ (67,484) | 1,175,564 | (8,671) | 595,322 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 288,934 | 288,934 |  |  |  |  |  | 288,934 |  |  |  |  |  |
Other comprehensive income, net of tax | 11,419 | 11,419 |  |  |  |  | 11,419 |  |  |  |  |  |  |
Total comprehensive income | $ 300,353 | 300,353 |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, series B ($3.91 per share) |  |  |  |  |  |  |  |  |  | (3,961) |  | (3,961) | $ (11,753) | $ (11,753)
Redemption of Series A Preferred Stock | (3,358,417) |  |  |  |  |  |  |  |  |  | (3,300,000) |  |  |
Redemption of Series A Preferred Stock |  |  |  |  |  |  |  |  | $ (165,000) |  | $ (165,000) |  |  |
Dividend equivalent units related to employee stock-based compensation plans |  | 0 |  |  |  | 96 |  | (96) |  |  |  |  |  |
Issuance of common shares (in shares) | 6,831,108 |  |  | 6,831,108 |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  | 19,655 |  | $ 1,366 |  | 18,289 |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 27,899 |  |  |  | 27,899 |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  |  |  | (3,358,417) | (3,358,417) |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  | (40,160) |  |  | $ (40,160) |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2017 |  |  | 4,000,000 | 443,463,587 |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2017 |  |  |  | 432,376,250 | (11,087,337) |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2017 | $ 2,474,256 | 2,474,256 | $ 400,000 | $ 88,693 | $ (107,644) | 1,222,277 | 2,748 | 868,182 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification resulting from the adoption of ASU No. 2017-12 | 165 |  |  |  |  | 429 |  | (264) |  |  |  |  |  |
Net income | 487,476 | 487,476 |  |  |  |  |  | 487,476 |  |  |  |  |  |
Other comprehensive income, net of tax | 7,013 | 7,013 |  |  |  |  | 7,013 |  |  |  |  |  |  |
Total comprehensive income | $ 494,489 | 494,489 |  |  |  |  |  |  |  |  |  |  |  |
Reclassification resulting from the adoption of ASU No. 2018-02 |  | 0 |  |  |  | 0 |  | (592) |  |  |  |  |  |
Reclassification resulting from the adoption of ASU No. 2018-02 |  |  |  |  |  |  | 592 |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, series B ($3.91 per share) |  |  |  |  |  |  |  |  |  | $ (15,640) |  | $ (15,640) |  |
Redemption of Series A Preferred Stock | (3,087,396) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares (in shares) | 6,392,634 |  |  | 6,392,634 |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  | 22,113 |  | $ 1,279 |  | 20,834 |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 31,524 |  |  |  | 31,524 |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  |  |  | (3,087,396) | (3,087,396) |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  | (34,947) |  |  | $ (34,947) |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2018 |  |  | 4,000,000 | 449,856,221 |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  |  |  | 435,681,488 | (14,174,733) |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | $ 2,972,656 | $ 2,972,656 | $ 400,000 | $ 89,972 | $ (142,591) | $ 1,274,635 | 10,623 | 1,340,017 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification resulting from the adoption of ASU No. 2017-12 | Accounting Standards Update 2017-12 [Member] | $ 861 |  |  |  |  |  | $ 270 | $ 591 |  |  |  |  |  |

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