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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ 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
Numerator:                      
Net income $ (77,043) $ 75,172 $ 342,073 $ 128,812 $ 306,265 $ 72,840 $ 140,201 $ 641,207 $ 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
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
Denominator:                      
Weighted average shares used to compute basic EPS (in shares)                 258,439,000 314,993,000 383,705,000
Effect of dilutive securities:                      
Dilutive effect of stock options, restricted stock, restricted stock units and Employee Stock Purchase Plan (ESPP) (in shares)                 3,064,000 4,919,000 3,490,000
Weighted average shares used to compute diluted EPS (in shares)                 261,503,000 319,912,000 387,195,000
Basic earnings per common share (in usd per share) $ (0.33) $ 0.29 $ 1.30 $ 0.46 $ 1.06 $ 0.24 $ 0.45 $ 1.77 $ 1.78 $ 3.67 $ 2.27
Diluted earnings per common share (in usd per share) $ (0.33) $ 0.29 $ 1.29 $ 0.45 $ 1.04 $ 0.24 $ 0.44 $ 1.75 $ 1.76 $ 3.61 $ 2.25
Antidilutive securities excluded from computation of earnings per share (in shares)                 1,000,000 1,000,000 0