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Parent Only Statements - Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Income Statements, Captions [Line Items]                      
Interest income                 $ 2,031,580 $ 1,776,844 $ 2,021,660
Interest expense                 542,799 382,078 541,667
Net interest income $ 381,431 $ 369,510 $ 362,808 $ 375,032 $ 367,350 $ 357,518 $ 338,784 $ 331,114 1,488,781 1,394,766 1,479,993
Non-interest expenses                 559,241 519,908 564,303
Income tax expense (benefit) (19,492) 29,551 114,296 37,356 103,660 19,392 53,174 203,525 161,711 379,751 273,316
Net income                 469,014 1,160,513 880,690
Preferred stock dividends 3,466 2,531 1,757 1,275 1,177 1,166 1,192 1,201 9,029 4,736 9,734
Net income attributable to SLM Corporation common stock $ (80,509) $ 72,641 $ 340,316 $ 127,537 $ 305,088 $ 71,674 $ 139,009 $ 640,006 459,985 1,155,777 870,956
Parent Company                      
Condensed Income Statements, Captions [Line Items]                      
Interest income                 4,084 392 452
Interest expense                 39,860 35,208 14,896
Net interest income                 (35,776) (34,816) (14,444)
Non-interest income (loss)                 (5,117) (13,078) 2,820
Non-interest expenses                 55,466 54,352 57,945
Loss before income tax benefit and equity in net income from subsidiaries                 (96,359) (102,246) (69,569)
Income tax expense (benefit)                 (10,351) 8,477 (11,235)
Equity in net income from subsidiaries (primarily Sallie Mae Bank)                 555,022 1,271,236 939,024
Net income                 469,014 1,160,513 880,690
Preferred stock dividends                 9,029 4,736 9,734
Net income attributable to SLM Corporation common stock                 $ 459,985 $ 1,155,777 $ 870,956