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Parent Only Statements - Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Income Statements, Captions [Line Items]                      
Interest income                 $ 2,021,660 $ 2,331,032 $ 1,935,352
Interest expense                 541,667 707,717 522,288
Net interest income $ 366,537 $ 364,567 $ 348,775 $ 400,116 $ 419,101 $ 405,065 $ 396,868 $ 402,281 1,479,993 1,623,315 1,413,064
Non-interest income (loss)                 331,449 48,927 (51,895)
Non-interest expenses                 564,303 574,253 556,976
Income tax benefit 127,310 55,189 (30,664) 121,481 34,666 40,701 33,801 56,296 273,316 165,464 71,853
Net income                 880,690 578,276 487,476
Preferred stock dividends 1,734 2,058 2,478 3,464 3,885 4,153 4,331 4,468 9,734 16,837 15,640
Net income attributable to SLM Corporation common stock $ 430,966 $ 168,970 $ (87,689) $ 358,709 $ 137,467 $ 124,305 $ 145,946 $ 153,721 870,956 561,439 471,836
Parent Company                      
Condensed Income Statements, Captions [Line Items]                      
Interest income                 452 2,663 4,693
Interest expense                 14,896 11,060 11,059
Net interest income                 (14,444) (8,397) (6,366)
Non-interest income (loss)                 2,820 (10,856) (93,176)
Non-interest expenses                 57,945 39,423 41,893
Loss before income tax benefit and equity in net income from subsidiaries                 (69,569) (58,676) (141,435)
Income tax benefit                 (11,235) (25,260) (96,170)
Equity in net income from subsidiaries (primarily Sallie Mae Bank)                 939,024 611,692 532,741
Net income                 880,690 578,276 487,476
Preferred stock dividends                 9,734 16,837 15,640
Net income attributable to SLM Corporation common stock                 $ 870,956 $ 561,439 $ 471,836