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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 309,191 | $ 282,061 | $ 269,893 | $ 268,076 | $ 245,434 | $ 223,275 | $ 212,766 | $ 209,863 | $ 1,129,221 | $ 891,338 | $ 702,499
Less: provisions for credit losses | 55,324 | 54,930 | 50,215 | 25,296 | 43,226 | 41,784 | 41,793 | 32,602 | 185,765 | 159,405 | 90,055
Net interest income after provisions for credit losses | 253,867 | 227,131 | 219,678 | 242,780 | 202,208 | 181,491 | 170,973 | 177,261 | 943,456 | 731,933 | 612,444
Gains on sales of loans, net |  |  |  |  | 230 | 0 | 0 | 0 |  |  |
(Losses) gains on derivative and hedging activities, net | (940) | 1,661 | (3,609) | (5,378) | (4,114) | 1,368 | 2,142 | (354) |  |  |
Other income (loss) | (21,066) | 4,455 | 10,629 | 11,346 | 13,235 | 21,598 | 13,683 | 21,028 | 5,364 | 69,544 | 41,935
Total operating expenses | 118,550 | 116,142 | 111,251 | 102,677 | 98,036 | 99,709 | 94,777 | 92,885 | 448,620 | 385,407 | 349,095
Acquired intangible asset amortization expense | 118 | 117 | 117 | 117 | 159 | 226 | 261 | 260 |  |  |
Restructuring and other reorganization expenses |  |  |  |  |  |  |  |  | 0 | 0 | 5,398
Income tax benefit | 66,190 | 40,617 | 44,713 | 51,011 | 43,122 | 47,557 | 34,555 | 38,875 | 202,531 | 164,109 | 164,780
Net income | 47,003 | 76,371 | 70,617 | 94,943 | 70,242 | 56,965 | 57,205 | 65,915 | 288,934 | 250,327 | 274,284
Preferred stock dividends | 3,137 | 3,028 | 3,974 | 5,575 | 5,506 | 5,316 | 5,243 | 5,139 | 15,714 | 21,204 | 19,595
Net income attributable to SLM Corporation common stock | $ 43,866 | $ 73,343 | $ 66,643 | $ 89,368 | $ 64,736 | $ 51,649 | $ 51,962 | $ 60,776 | $ 273,220 | $ 229,123 | $ 254,689
Basic earnings per common share attributable to SLM Corporation (in dollars per share) | $ 0.10 | $ 0.17 | $ 0.15 | $ 0.21 | $ 0.15 | $ 0.12 | $ 0.12 | $ 0.14 | $ 0.63 | $ 0.54 | $ 0.60
Diluted earnings per common share attributable to SLM Corporation (in dollars per share) | $ 0.10 | $ 0.17 | $ 0.15 | $ 0.20 | $ 0.15 | $ 0.12 | $ 0.12 | $ 0.14 | $ 0.62 | $ 0.53 | $ 0.59

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