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Parent Only Statements - Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 831,118 | $ 674,294 | $ 551,200
Interest expense |  |  |  |  |  |  |  |  | 128,619 | 95,815 | 89,085
Net interest income | $ 187,846 | $ 175,442 | $ 168,257 | $ 170,954 | $ 150,676 | $ 144,026 | $ 144,539 | $ 139,238 | 702,499 | 578,479 | 462,115
Other income | 12,561 | 10,455 | 10,912 | 8,007 | 11,095 | 5,461 | 15,229 | 8,136 | 41,935 | 39,921 | 37,222
Operating expenses | 85,245 | 92,864 | 89,799 | 81,187 | 78,724 | 72,079 | 60,479 | 63,671 | 349,095 | 274,881 | 270,474
Income tax expense | 54,915 | 17,985 | 60,158 | 31,722 | 24,465 | 54,903 | 31,941 | 28,658 | 164,780 | 139,967 | 158,934
Net income |  |  |  |  | 19,717 | 82,926 | 44,128 | 47,014 | 274,284 | 193,785 | 257,593
Preferred stock dividends | (4,989) | (4,913) | (4,870) | (4,823) | (4,855) | (4,850) | (3,228) | 0 | (19,595) | (12,933) | 0
Net income attributable to SLM Corporation common stock | $ 84,856 | $ 40,811 | $ 86,146 | $ 42,876 | $ 14,862 | $ 78,076 | $ 40,900 | $ 47,448 | 254,689 | 181,286 | 258,945
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 6,414 | 4,980 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net interest income |  |  |  |  |  |  |  |  | 6,414 | 4,980 | 0
Other income |  |  |  |  |  |  |  |  | (239) | 1,097 | 0
Operating expenses |  |  |  |  |  |  |  |  | 36,141 | 36,967 | 3,556
Loss before income tax expense (benefit) and equity in net income from subsidiaries |  |  |  |  |  |  |  |  | (29,966) | (30,890) | (3,556)
Income tax expense |  |  |  |  |  |  |  |  | (8,612) | (13,196) | 133,121
Equity in net income from subsidiaries (primarily Sallie Mae Bank) |  |  |  |  |  |  |  |  | 295,638 | 211,479 | 394,270
Net income |  |  |  |  |  |  |  |  | 274,284 | 193,785 | 257,593
Preferred stock dividends |  |  |  |  |  |  |  |  | 19,595 | 12,933 | 0
Net income attributable to SLM Corporation common stock |  |  |  |  |  |  |  |  | $ 254,689 | $ 180,852 | $ 257,593

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