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Parent Only Statements - Statements of Income (Details) - USD ($) $ 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
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 1,935,352 | $ 1,437,303 | $ 1,077,246
Interest expense |  |  |  |  |  |  |  |  | 522,288 | 308,082 | 185,908
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
Non-interest income (loss) |  |  |  |  |  |  |  |  | (51,895) | (2,902) | 68,816
Non-interest expenses |  |  |  |  |  |  |  |  | 556,976 | 449,089 | 386,313
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 |  |  |  |  |  |  |  |  | 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
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 4,693 | 5,497 | 5,367
Interest expense |  |  |  |  |  |  |  |  | 11,059 | 8,170 | 0
Net interest income |  |  |  |  |  |  |  |  | (6,366) | (2,673) | 5,367
Non-interest income (loss) |  |  |  |  |  |  |  |  | (93,176) | (33,956) | 9,396
Non-interest expenses |  |  |  |  |  |  |  |  | 41,893 | 35,810 | 32,553
Loss before income tax benefit and equity in net income from subsidiaries |  |  |  |  |  |  |  |  | (141,435) | (72,439) | (17,790)
Income tax benefit |  |  |  |  |  |  |  |  | (96,170) | (40,598) | (2,839)
Equity in net income from subsidiaries (primarily Sallie Mae Bank) |  |  |  |  |  |  |  |  | 532,741 | 320,775 | 265,278
Net income |  |  |  |  |  |  |  |  | 487,476 | 288,934 | 250,327
Preferred stock dividends |  |  |  |  |  |  |  |  | 15,640 | 15,714 | 21,204
Net income attributable to SLM Corporation common stock |  |  |  |  |  |  |  |  | $ 471,836 | $ 273,220 | $ 229,123

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