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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 419,101 | $ 405,065 | $ 396,868 | $ 402,281 | $ 382,867 | $ 356,633 | $ 340,950 | $ 332,614 | $ 1,623,315 | $ 1,413,064 | $ 1,129,221
Less: provisions for credit losses | 97,558 | 99,526 | 93,375 | 63,790 | 57,619 | 70,047 | 63,267 | 53,931 | 354,249 | 244,864 | 185,765
Net interest income after provisions for credit losses | 321,543 | 305,539 | 303,493 | 338,491 | 325,248 | 286,586 | 277,683 | 278,683 | 1,269,066 | 1,168,200 | 943,456
Gains on sales of loans, net |  |  |  |  | 0 | 0 | 2,060 | 0 |  |  |
Losses on sales of securities, net |  |  |  |  | 0 | 0 | (1,549) | 0 | 0 | (1,549) | 0
Gains (losses) on derivative and hedging activities, net | (3,635) | 1,961 | 16,736 | 2,763 | 6,238 | (4,949) | (5,268) | 3,892 |  |  |
Other income (loss) | (211) | 15,280 | 2,655 | 13,378 | 6,446 | (80,702) | 12,295 | 9,642 | 31,102 | (52,319) | 5,364
Total non-interest expenses | 141,679 | 153,621 | 138,806 | 140,147 | 145,971 | 150,724 | 135,315 | 124,966 |  |  |
Income tax benefit | 34,666 | 40,701 | 33,801 | 56,296 | 44,449 | (53,667) | 40,074 | 40,997 | 165,464 | 71,853 | 202,531
Net income | 141,352 | 128,458 | 150,277 | 158,189 | 147,512 | 103,878 | 109,832 | 126,254 | 578,276 | 487,476 | 288,934
Preferred stock dividends | 3,885 | 4,153 | 4,331 | 4,468 | 4,199 | 4,124 | 3,920 | 3,397 | 16,837 | 15,640 | 15,714
Net income attributable to SLM Corporation common stock | $ 137,467 | $ 124,305 | $ 145,946 | $ 153,721 | $ 143,313 | $ 99,754 | $ 105,912 | $ 122,857 | $ 561,439 | $ 471,836 | $ 273,220
Basic earnings per common share attributable to SLM Corporation (in usd per share) | $ 0.33 | $ 0.29 | $ 0.34 | $ 0.35 | $ 0.33 | $ 0.23 | $ 0.24 | $ 0.28 | $ 1.31 | $ 1.08 | $ 0.63
Diluted earnings per common share attributable to SLM Corporation (in usd per share) | 0.32 | 0.29 | 0.34 | 0.35 | $ 0.33 | $ 0.23 | $ 0.24 | $ 0.28 | 1.30 | 1.07 | 0.62
Declared dividends per common share attributable to SLM Corporation (in usd per share) | $ 0.03 | $ 0 | $ 0.06 | $ 0.03 |  |  |  |  | $ 0.12 | $ 0 | $ 0

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