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Selected Quarterly Financial Information (unaudited) (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
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
Less: provisions for credit losses (316,372) (3,640) 351,887 61,258 97,558 99,526 93,375 63,790 93,133 354,249 244,864
Net interest income after provisions for credit losses 682,909 368,207 (3,112) 338,858 321,543 305,539 303,493 338,491 1,386,860 1,269,066 1,168,200
Gains on sales of loans, net (247) (4) (369) 238,935         238,315 0 2,060
Gains (losses) on derivative and hedging activities, net 136 (15) 3,751 45,672 (3,635) 1,961 16,736 2,763      
Other income 1,043 9,646 25,412 7,487 (211) 15,280 2,655 13,378 43,590 31,102 (52,319)
Total operating expenses 121,743 127,490 141,557 147,298 141,679 153,621 138,806 140,147 538,088 574,253 556,976
Restructuring expenses 2,088 24,127 0 0         26,215 0 0
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 (loss) 432,700 171,028 (85,211) 362,173 141,352 128,458 150,277 158,189 880,690 578,276 487,476
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
Basic earnings per common share attributable to SLM Corporation (in usd per share) $ 1.15 $ 0.45 $ (0.23) $ 0.88 $ 0.33 $ 0.29 $ 0.34 $ 0.35 $ 2.27 $ 1.31 $ 1.08
Diluted earnings per common share attributable to SLM Corporation (in usd per share) 1.13 0.45 (0.23) 0.87 0.32 0.29 0.34 0.35 2.25 1.30 1.07
Declared dividends per common share attributable to SLM Corporation (in usd per share) $ 0.03 $ 0 $ 0.06 $ 0.03 $ 0.03 $ 0 $ 0.06 $ 0.03 $ 0.12 $ 0.12 $ 0