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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net income $ 126,254 $ 94,943
Preferred stock dividends 3,397 5,575
Net income attributable to SLM Corporation common stock $ 122,857 $ 89,368
Denominator:    
Weighted average shares used to compute basic EPS (in shares) 433,952,000 429,891,000
Effect of dilutive securities:    
Dilutive effect of stock options, restricted stock and restricted stock units and Employee Stock Purchase Plan (ESPP) (in shares) 5,025,000 8,844,000
Weighted average shares used to compute diluted EPS (in shares) 438,977,000 438,735,000
Basic earnings per common share attributable to SLM Corporation (in dollars per share) $ 0.28 $ 0.21
Diluted earnings per common share attributable to SLM Corporation (in dollars per share) $ 0.28 $ 0.20
Securities excluded from computation of EPS (in shares) 0 0