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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net income $ 70,617 $ 57,205 $ 165,560 $ 123,120
Preferred stock dividends 3,974 5,243 9,549 10,382
Net income attributable to SLM Corporation common stock $ 66,643 $ 51,962 $ 156,011 $ 112,738
Denominator:        
Weighted average shares used to compute basic EPS (in shares) 431,245,000 427,942,000 430,572,000 427,526,000
Effect of dilutive securities:        
Dilutive effect of stock options, restricted stock and restricted stock units and Employee Stock Purchase Plan (ESPP) (in shares) 6,870,000 3,854,000 7,852,000 3,823,000
Weighted average shares used to compute diluted EPS (in shares) 438,115,000 431,796,000 438,424,000 431,349,000
Basic earnings per common share attributable to SLM Corporation (in dollars per share) $ 0.15 $ 0.12 $ 0.36 $ 0.26
Diluted earnings per common share attributable to SLM Corporation (in dollars per share) $ 0.15 $ 0.12 $ 0.35 $ 0.26
Securities excluded from computation of EPS (in shares) 0 1,000,000 0 4,000,000