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Parent Only Statements - Statements of Income (Details) - USD ($) $ 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
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 1,437,303 | $ 1,077,246 | $ 831,118
Interest expense |  |  |  |  |  |  |  |  | 308,082 | 185,908 | 128,619
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
Non-interest income (loss) |  |  |  |  |  |  |  |  | (2,902) | 68,816 | 182,593
Non-interest expenses |  |  |  |  |  |  |  |  | 449,089 | 386,313 | 355,973
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 |  |  |  |  |  |  |  |  | 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
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 5,497 | 5,367 | 6,414
Interest expense |  |  |  |  |  |  |  |  | 8,170 | 0 | 0
Net interest income |  |  |  |  |  |  |  |  | (2,673) | 5,367 | 6,414
Non-interest income (loss) |  |  |  |  |  |  |  |  | (33,956) | 9,396 | (239)
Non-interest expenses |  |  |  |  |  |  |  |  | 35,810 | 32,553 | 36,141
Loss before income tax benefit and equity in net income from subsidiaries |  |  |  |  |  |  |  |  | (72,439) | (17,790) | (29,966)
Income tax benefit |  |  |  |  |  |  |  |  | (40,598) | (2,839) | (8,612)
Equity in net income from subsidiaries (primarily Sallie Mae Bank) |  |  |  |  |  |  |  |  | 320,775 | 265,278 | 295,638
Net income |  |  |  |  |  |  |  |  | 288,934 | 250,327 | 274,284
Preferred stock dividends |  |  |  |  |  |  |  |  | 15,714 | 21,204 | 19,595
Net income attributable to SLM Corporation common stock |  |  |  |  |  |  |  |  | $ 273,220 | $ 229,123 | $ 254,689

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