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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Numerator:                      
Net income $ 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
Denominator:                      
Weighted average shares used to compute basic EPS (in shares)                 383,705 427,292 435,054
Effect of dilutive securities:                      
Dilutive effect of stock options, restricted stock, restricted stock units and Employee Stock Purchase Plan (ESPP) (in shares)                 3,490 3,382 4,627
Weighted average shares used to compute diluted EPS (in shares)                 387,195 430,674 439,681
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
Antidilutive securities excluded from computation of earnings per share (in shares)                 0 0 1,000