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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Series A Preferred Stock | Total SLM Corporation Equity | Total SLM Corporation Equity Series A Preferred Stock | Total SLM Corporation Equity Series B Preferred Stock | Redemption of Series A Preferred Stock | Redemption of Series A Preferred Stock Series A Preferred Stock | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Retained Earnings Series A Preferred Stock | Retained Earnings Series B Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance, shares issued (in shares) at Dec. 31, 2016 |  |  |  |  |  | 7,300,000 |  | 436,632,479 |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2016 |  |  |  |  |  |  |  | 428,903,559 | (7,728,920) |  |  |  |  |
Beginning 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) | $ (11,753) |  |  |  |  |  |  |  | $ (3,961) | $ (11,753)
Redemption of Series A Preferred Stock (in shares) | (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 |  |  |  |
Common stock repurchased (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  |  |  |  | (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 |  |  | $ 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. 2018-02 | $ 600 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, shares issued (in shares) at Dec. 31, 2017 |  |  |  |  |  | 4,000,000 |  | 443,463,587 |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2017 |  |  |  |  |  |  |  | 432,376,250 | (11,087,337) |  |  |  |  |
Beginning balance at Dec. 31, 2017 |  |  | 2,474,256 |  |  | $ 400,000 |  | $ 88,693 | $ (107,644) | 1,222,277 | 2,748 | 868,182 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | (592) |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, series B ($3.91 per share) |  |  |  | $ (15,640) |  |  |  |  |  |  |  |  | $ (15,640) |
Redemption of Series A Preferred Stock (in shares) | (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 |  |  |  |
Common stock repurchased (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  |  |  |  | (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 | 861 |  |  |  |  |  |  |  |  |  | 270 | 591 |  |
Net income | 578,276 |  | 578,276 |  |  |  |  |  |  |  |  | 578,276 |  |
Other comprehensive income, net of tax | (22,990) |  | (22,990) |  |  |  |  |  |  |  | (22,990) |  |  |
Total comprehensive income | $ 555,286 |  | 555,286 |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, series B ($3.91 per share) |  |  | (16,837) |  |  |  |  |  |  |  |  | (16,837) |  |
Common Stock ($0.12 per share) |  |  | (51,114) |  |  |  |  |  |  |  |  | (51,114) |  |
Redemption of Series A Preferred Stock (in shares) | (1,369,630) |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend equivalent units related to employee stock-based compensation plans |  |  | 0 |  |  |  |  |  |  | 5 |  | (5) |  |
Issuance of common shares (in shares) | 3,743,705 |  |  |  |  |  |  | 3,743,705 |  |  |  |  |  |
Issuance of common shares |  |  | 3,375 |  |  |  |  | $ 748 |  | 2,627 |  |  |  |
Stock-based compensation expense |  |  | 30,538 |  |  |  |  |  |  | 30,363 |  | 175 |  |
Common stock repurchased (in shares) | (16,962,199) |  |  |  |  |  |  | (16,962,199) | (16,962,199) |  |  |  |  |
Common stock repurchased | $ (33,000) |  | (167,201) |  |  |  |  |  | $ (167,201) |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  |  |  |  | (1,369,630) | (1,369,630) |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  |  | (14,867) |  |  |  |  |  | $ (14,867) |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2019 |  |  |  |  |  | 4,000,000 |  | 453,599,926 |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  | 421,093,364 | (32,506,562) |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 3,311,836 |  | $ 3,311,836 |  |  | $ 400,000 |  | $ 90,720 | $ (324,659) | $ 1,307,630 | $ (12,367) | $ 1,850,512 |  |

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