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Parent Only Statements - Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Income Statements, Captions [Line Items]                      
Interest income                 $ 1,077,246 $ 831,118 $ 674,294
Interest expense                 185,908 128,619 95,815
Net interest income $ 245,434 $ 223,275 $ 212,766 $ 209,863 $ 187,846 $ 175,442 $ 168,257 $ 170,954 891,338 702,499 578,479
Other income 13,235 21,598 13,683 21,028 12,561 10,455 10,912 8,007 69,544 41,935 39,921
Operating expenses 98,036 99,709 94,777 92,885 85,245 92,864 89,799 81,187 385,407 349,095 274,881
Income tax benefit 43,122 47,557 34,555 38,875 54,915 17,985 60,158 31,722 164,109 164,780 139,967
Net income                 250,327 274,284 193,785
Preferred stock dividends 5,506 5,316 5,243 5,139 4,989 4,913 4,870 4,823 21,204 19,595 12,933
Net income attributable to SLM Corporation common stock $ 64,736 $ 51,649 $ 51,962 $ 60,776 $ 84,856 $ 40,811 $ 86,146 $ 42,876 229,123 254,689 181,286
Parent Company                      
Condensed Income Statements, Captions [Line Items]                      
Interest income                 5,367 6,414 4,980
Interest expense                 0 0 0
Net interest income                 5,367 6,414 4,980
Other income                 9,396 (239) 1,097
Operating expenses                 32,553 36,141 36,967
Loss before income tax benefit and equity in net income from subsidiaries                 (17,790) (29,966) (30,890)
Income tax benefit                 (2,839) (8,612) (13,196)
Equity in net income from subsidiaries (primarily Sallie Mae Bank)                 265,278 295,638 211,479
Net income                 250,327 274,284 193,785
Preferred stock dividends                 21,204 19,595 12,933
Net income attributable to SLM Corporation common stock                 $ 229,123 $ 254,689 $ 180,852