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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Total SLM Corporation Equity | Total SLM Corporation Equity Cumulative Effect, Period of Adoption, Adjustment | Total SLM Corporation Equity Cumulative Effect, Period Of Adoption, Adjusted Balance | Total SLM Corporation Equity Series B Preferred Stock | Preferred Stock | Preferred Stock Cumulative Effect, Period Of Adoption, Adjusted Balance | Preferred Stock Series B Preferred Stock | Common Stock | Common Stock Cumulative Effect, Period Of Adoption, Adjusted Balance | Treasury Stock | Treasury Stock Cumulative Effect, Period Of Adoption, Adjusted Balance | Additional Paid-In Capital | Additional Paid-In Capital Cumulative Effect, Period Of Adoption, Adjusted Balance | Additional Paid-In Capital Series B Preferred Stock | Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income Cumulative Effect, Period Of Adoption, Adjusted Balance | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period Of Adoption, Adjusted Balance | Retained Earnings Series B Preferred Stock
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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 |  |  |
Beginning balance (Accounting Standards Update 2018-02) at Dec. 31, 2017 |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 592 |  |  | $ (592) |  |
Beginning balance (Accounting Standards Update 2017-12) at Dec. 31, 2017 |  |  | 861 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 270 |  |  | 591 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  | $ (15,640) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (15,640)
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 (in shares) |  |  |  |  |  |  |  |  | (3,087,396) |  | (3,087,396) |  |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  | (34,947) |  |  |  |  |  |  |  |  | $ (34,947) |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of Preferred Stock, series B (in shares) | (3,087,396) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 400,000 |  |  | $ 89,972 |  | $ (142,591) |  | 1,274,635 |  |  | 10,623 |  |  | 1,340,017 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | (16,837) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,837)
Common stock |  | (51,114) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (51,114) |  |  |
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 |  |  |
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) |  |  |  |  |  |  |  |  |  |  |
Dividend equivalent units related to employee stock-based compensation plans |  | 0 |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  | (5) |  |  |
Common stock repurchased (in shares) | (16,962,199) |  |  |  |  |  |  |  | (16,962,199) |  | (16,962,199) |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  | (167,201) |  |  |  |  |  |  |  |  | $ (167,201) |  |  |  |  |  |  |  |  |  |  |
Repurchase of Preferred Stock, series B (in shares) | (1,369,630) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2019 |  |  |  |  |  | 4,000,000 | 4,000,000 |  | 453,599,926 | 453,599,926 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  |  | 421,093,364 | 421,093,364 | (32,506,562) | (32,506,562) |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 3,311,836 | 3,311,836 | $ (952,639) | $ 2,359,197 |  | $ 400,000 | $ 400,000 |  | $ 90,720 | $ 90,720 | $ (324,659) | $ (324,659) | 1,307,630 | $ 1,307,630 |  | (12,367) |  | $ (12,367) | 1,850,512 | $ (952,639) | $ 897,873 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 880,690 | 880,690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 880,690 |  |  |
Other comprehensive income, net of tax | (21,833) | (21,833) |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,833) |  |  |  |  |  |
Total comprehensive income | $ 858,857 | 858,857 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  | (9,734) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (9,734)
Common stock |  | (46,351) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (46,351) |  |  |
Issuance of common shares (in shares) | 3,129,325 |  |  |  |  |  |  |  | 3,129,325 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  | 3,602 |  |  |  |  |  |  | $ 626 |  |  |  | 2,976 |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 36,586 |  |  |  |  |  |  |  |  |  |  | 36,418 |  |  |  |  |  | 168 |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  |  |  |  |  | (1,197,843) |  | (1,197,843) |  |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  | (13,090) |  |  |  |  |  |  |  |  | $ (13,090) |  |  |  |  |  |  |  |  |  |  |
Dividend equivalent units related to employee stock-based compensation plans |  | (10) |  |  |  |  |  |  |  |  |  |  | 271 |  |  |  |  |  | (281) |  |  |
Common stock repurchased (in shares) | (47,736,847) |  |  |  |  |  |  |  | (47,736,847) |  | (47,736,847) |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased | $ (75,000) | (558,167) |  |  |  |  |  |  |  |  | $ (461,244) |  | (96,923) |  |  |  |  |  |  |  |  |
Repurchase of Preferred Stock, series B (in shares) | (1,197,843) |  |  |  |  |  |  | (1,489,304) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of Preferred Stock, series B |  |  |  |  | $ (68,055) |  |  | $ (148,930) |  |  |  |  |  |  | $ 80,875 |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2020 |  |  |  |  |  | 2,510,696 |  |  | 456,729,251 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  |  | 375,287,999 |  | (81,441,252) |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 2,562,835 | $ 2,562,835 |  |  |  | $ 251,070 |  |  | $ 91,346 |  | $ (798,993) |  | $ 1,331,247 |  |  | $ (34,200) |  |  | $ 1,722,365 |  |  |

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