v3.26.1
Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator:        
Net income $ 58,525 $ 71,272 $ 366,479 $ 375,812
Preferred stock dividends 3,581 3,972 7,136 7,928
Net income attributable to SLM Corporation common stock 54,944 67,300 359,343 367,884
Net income attributable to SLM Corporation common stock $ 54,944 $ 67,300 $ 359,343 $ 367,884
Denominator:        
Weighted average shares used to compute basic EPS (in shares) 188,576 209,282 191,999 209,978
Effect of dilutive securities:        
Dilutive effect of stock options, restricted stock, restricted stock units, performance stock units, and Employee Stock Purchase Plan (“ESPP”) (in shares) 1,808 3,938 2,110 4,120
Weighted average shares used to compute diluted EPS (in shares) 190,384 213,220 194,109 214,098
Basic earnings per common share (in dollars per share) $ 0.29 $ 0.32 $ 1.87 $ 1.75
Diluted earnings per common share (in dollars per share) $ 0.29 $ 0.32 $ 1.85 $ 1.72
Antidilutive securities excluded from computation of earnings per share (less than) (in shares) 1,000 1,000