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Parent Only Statements - Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 2,021,660 | $ 2,331,032 | $ 1,935,352
Interest expense |  |  |  |  |  |  |  |  | 541,667 | 707,717 | 522,288
Net interest income | $ 366,537 | $ 364,567 | $ 348,775 | $ 400,116 | $ 419,101 | $ 405,065 | $ 396,868 | $ 402,281 | 1,479,993 | 1,623,315 | 1,413,064
Non-interest income (loss) |  |  |  |  |  |  |  |  | 331,449 | 48,927 | (51,895)
Non-interest expenses |  |  |  |  |  |  |  |  | 564,303 | 574,253 | 556,976
Income tax benefit | 127,310 | 55,189 | (30,664) | 121,481 | 34,666 | 40,701 | 33,801 | 56,296 | 273,316 | 165,464 | 71,853
Net income |  |  |  |  |  |  |  |  | 880,690 | 578,276 | 487,476
Preferred stock dividends | 1,734 | 2,058 | 2,478 | 3,464 | 3,885 | 4,153 | 4,331 | 4,468 | 9,734 | 16,837 | 15,640
Net income attributable to SLM Corporation common stock | $ 430,966 | $ 168,970 | $ (87,689) | $ 358,709 | $ 137,467 | $ 124,305 | $ 145,946 | $ 153,721 | 870,956 | 561,439 | 471,836
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 452 | 2,663 | 4,693
Interest expense |  |  |  |  |  |  |  |  | 14,896 | 11,060 | 11,059
Net interest income |  |  |  |  |  |  |  |  | (14,444) | (8,397) | (6,366)
Non-interest income (loss) |  |  |  |  |  |  |  |  | 2,820 | (10,856) | (93,176)
Non-interest expenses |  |  |  |  |  |  |  |  | 57,945 | 39,423 | 41,893
Loss before income tax benefit and equity in net income from subsidiaries |  |  |  |  |  |  |  |  | (69,569) | (58,676) | (141,435)
Income tax benefit |  |  |  |  |  |  |  |  | (11,235) | (25,260) | (96,170)
Equity in net income from subsidiaries (primarily Sallie Mae Bank) |  |  |  |  |  |  |  |  | 939,024 | 611,692 | 532,741
Net income |  |  |  |  |  |  |  |  | 880,690 | 578,276 | 487,476
Preferred stock dividends |  |  |  |  |  |  |  |  | 9,734 | 16,837 | 15,640
Net income attributable to SLM Corporation common stock |  |  |  |  |  |  |  |  | $ 870,956 | $ 561,439 | $ 471,836

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