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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:        
Net income $ 103,878 $ 76,371 $ 339,964 $ 241,931
Preferred stock dividends 4,124 3,028 11,441 12,577
Net income attributable to SLM Corporation common stock $ 99,754 $ 73,343 $ 328,523 $ 229,354
Denominator:        
Weighted average shares used to compute basic EPS (in shares) 435,468,000 431,718,000 434,875,000 430,958,000
Effect of dilutive securities:        
Dilutive effect of stock options, restricted stock and restricted stock units and Employee Stock Purchase Plan (ESPP) (in shares) 4,551,000 6,701,000 4,609,000 7,464,000
Weighted average shares used to compute diluted EPS (in shares) 440,019,000 438,419,000 439,484,000 438,422,000
Basic earnings per common share attributable to SLM Corporation (in dollars per share) $ 0.23 $ 0.17 $ 0.76 $ 0.53
Diluted earnings per common share attributable to SLM Corporation (in dollars per share) $ 0.23 $ 0.17 $ 0.75 $ 0.52
Securities excluded from computation of EPS (in shares) 0 0 0 0