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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Total Equity | Total Equity Cumulative Effect, Period of Adoption, Adjustment | Total Equity Cumulative Effect, Period Of Adoption, Adjusted Balance | Total 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 (Loss) | Accumulated Other Comprehensive Income (Loss) 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, 2018 |  |  |  |  |  | 4,000,000 |  |  | 449,856,221 |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  | 435,681,488 |  | (14,174,733) |  |  |  |  |  |  |  |  |  |
Beginning 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 loss, net of tax | (22,990) | (22,990) |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,990) |  |  |  |  |
Total comprehensive income | $ 555,286 | 555,286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | (51,114) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (51,114) |  |  |
Preferred stock |  |  |  |  | $ (16,837) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (16,837)
Repurchase of Preferred Stock, series B (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 |  | (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 (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  |  | 421,093,364 | 421,093,364 | (32,506,562) | (32,506,562) |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2019 |  |  |  |  |  | 4,000,000 | 4,000,000 |  | 453,599,926 | 453,599,926 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 |  | 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 |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 880,690 | 880,690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 880,690 |  |  |
Other comprehensive loss, net of tax | (21,833) | (21,833) |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,833) |  |  |  |  |
Total comprehensive income | $ 858,857 | 858,857 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | (46,351) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (46,351) |  |  |
Preferred stock |  |  |  |  | (9,734) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,734)
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 |  |  |  |  |  |
Dividend equivalent units related to employee stock-based compensation plans |  | (10) |  |  |  |  |  |  |  |  |  |  | 271 |  |  |  |  | (281) |  |  |
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 |  |  |
Common stock repurchased (in shares) | (47,736,847) |  |  |  |  |  |  |  | (47,736,847) |  | (47,736,847) |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  | (558,167) |  |  |  |  |  |  |  |  | $ (461,244) |  | (96,923) |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  |  | 375,287,999 |  | (81,441,252) |  |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2020 |  |  |  |  |  | 2,510,696 |  |  | 456,729,251 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,160,513 | 1,160,513 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,160,513 |  |  |
Other comprehensive loss, net of tax | 16,303 | 16,303 |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,303 |  |  |  |  |
Total comprehensive income | $ 1,176,816 | 1,176,816 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | (60,462) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (60,462) |  |  |
Preferred stock |  |  |  |  | $ (4,736) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (4,736)
Repurchase of Preferred Stock, series B (in shares) | (1,368,942) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend equivalent units related to employee stock-based compensation plans |  | (16) |  |  |  |  |  |  |  |  |  |  | 530 |  |  |  |  | (546) |  |  |
Issuance of common shares (in shares) | 3,786,581 |  |  |  |  |  |  |  | 3,786,581 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  | 4,891 |  |  |  |  |  |  | $ 757 |  |  |  | 4,134 |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 30,649 |  |  |  |  |  |  |  |  |  |  | 30,649 |  |  |  |  |  |  |  |
Common stock repurchased and cancelled (in shares) |  |  |  |  |  |  |  |  | (28,502,460) |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased and cancelled |  | (472,560) |  |  |  |  |  |  | $ (5,700) |  |  |  | (466,860) |  |  |  |  |  |  |  |
Common stock repurchased (in shares) | (98,748,905) |  |  |  |  |  |  |  | (70,246,445) |  | (70,246,445) |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  | (1,067,583) |  |  |  |  |  |  |  |  | $ (1,242,267) |  | 174,684 |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  |  |  |  |  | (1,368,942) |  | (1,368,942) |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  | (20,123) |  |  |  |  |  |  |  |  | $ (20,123) |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2021 |  |  |  |  |  |  |  |  | 278,956,733 |  | (153,056,639) |  |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2021 |  |  |  |  |  | 2,510,696 |  |  | 432,013,372 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2021 | $ 2,149,711 | $ 2,149,711 |  |  |  | $ 251,070 |  |  | $ 86,403 |  | $ (2,061,383) |  | $ 1,074,384 |  |  | $ (17,897) |  | $ 2,817,134 |  |  |

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- Definition Adjustments to Additional Paid In Capital, Dividends Equivalent Units Related to employee Stock-Based Compensation Plans + References No definition available. + Details
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Namespace Prefix: | slm_
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Period Type: | duration

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