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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 382,867 | $ 356,633 | $ 340,950 | $ 332,614 | $ 309,191 | $ 282,061 | $ 269,893 | $ 268,076 | $ 1,413,064 | $ 1,129,221 | $ 891,338
Less: provisions for credit losses | 57,619 | 70,047 | 63,267 | 53,931 | 55,324 | 54,930 | 50,215 | 25,296 | 244,864 | 185,765 | 159,405
Net interest income after provisions for credit losses | 325,248 | 286,586 | 277,683 | 278,683 | 253,867 | 227,131 | 219,678 | 242,780 | 1,168,200 | 943,456 | 731,933
Gains on sales of loans, net | 0 | 0 | 2,060 | 0 |  |  |  |  |  |  |
Losses on sales of securities, net | 0 | 0 | (1,549) | 0 |  |  |  |  | (1,549) | 0 | 0
Gains (losses) on derivative and hedging activities, net | 6,238 | (4,949) | (5,268) | 3,892 | (940) | 1,661 | (3,609) | (5,378) |  |  |
Other income (loss) | 6,446 | (80,702) | 12,295 | 9,642 | (21,066) | 4,455 | 10,629 | 11,346 | (52,319) | 5,364 | 69,544
Total non-interest expenses | 145,971 | 150,724 | 135,315 | 124,966 | 118,668 | 116,259 | 111,368 | 102,794 |  |  |
Income tax benefit | 44,449 | (53,667) | 40,074 | 40,997 | 66,190 | 40,617 | 44,713 | 51,011 | 71,853 | 202,531 | 164,109
Net income | 147,512 | 103,878 | 109,832 | 126,254 | 47,003 | 76,371 | 70,617 | 94,943 | 487,476 | 288,934 | 250,327
Preferred stock dividends | 4,199 | 4,124 | 3,920 | 3,397 | 3,137 | 3,028 | 3,974 | 5,575 | 15,640 | 15,714 | 21,204
Net income attributable to SLM Corporation common stock | $ 143,313 | $ 99,754 | $ 105,912 | $ 122,857 | $ 43,866 | $ 73,343 | $ 66,643 | $ 89,368 | $ 471,836 | $ 273,220 | $ 229,123
Basic earnings per common share attributable to SLM Corporation | $ 0.33 | $ 0.23 | $ 0.24 | $ 0.28 | $ 0.10 | $ 0.17 | $ 0.15 | $ 0.21 | $ 1.08 | $ 0.63 | $ 0.54
Diluted earnings per common share attributable to SLM Corporation | $ 0.33 | $ 0.23 | $ 0.24 | $ 0.28 | $ 0.10 | $ 0.17 | $ 0.15 | $ 0.20 | $ 1.07 | $ 0.62 | $ 0.53

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