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Borrowings - Financing VIEs (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Securities Financing Transaction [Line Items] |  |  |
Document Period End Date | Sep. 30, 2018 |  |
Debt Outstanding |  |  |
Short Term | $ 0 | $ 0 |
Long Term | 4,532,221 | 3,275,270 |
Total | 4,532,221 | 3,275,270 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Restricted Cash | 115,658 | 101,836 | $ 66,625
Other Assets | 101,000 | 84,853 |
Variable Interest Entity, Primary Beneficiary |  |  |
Debt Outstanding |  |  |
Short Term | 0 | 0 |
Long Term | 4,335,075 | 3,078,731 |
Total | 4,335,075 | 3,078,731 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Loans | 5,174,592 | 3,691,024 |
Restricted Cash | 111,555 | 96,983 |
Other Assets | 382,190 | 240,369 |
Total | 5,668,337 | 4,028,376 |
Variable Interest Entity, Primary Beneficiary | Private Education Loan securitization |  |  |
Debt Outstanding |  |  |
Short Term | 0 | 0 |
Long Term | 4,335,075 | 3,078,731 |
Total | 4,335,075 | 3,078,731 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Loans | 5,174,592 | 3,691,024 |
Restricted Cash | 111,555 | 95,966 |
Other Assets | 381,760 | 240,208 |
Total | 5,667,907 | 4,027,198 |
Variable Interest Entity, Primary Beneficiary | ABCP Facility |  |  |
Debt Outstanding |  |  |
Short Term | 0 | 0 |
Long Term | 0 | 0 |
Total | 0 | 0 |
Carrying Amount of Assets Securing Debt Outstanding |  |  |
Loans | 0 | 0 |
Restricted Cash | 0 | 1,017 |
Other Assets | 430 | 161 |
Total | $ 430 | $ 1,178 |

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