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Borrowings - Variable Interest Entity (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Outstanding |  |
Short-Term | $ 0 | $ 0
Long-Term | 3,275,270,000 | 2,167,979,000
Total | 3,275,270,000 | 2,167,979,000
Carrying Amount of Assets Securing Debt Outstanding |  |
Restricted Cash | 101,836,000 | 53,717,000
Other assets | 84,853,000 | 52,153,000
ABCP Facility |  |
Debt Outstanding |  |
Short-Term | 0 | 0
Variable Interest Entity, Primary Beneficiary |  |
Debt Outstanding |  |
Short-Term | 0 | 0
Long-Term | 3,078,731,000 | 2,167,979,000
Total | 3,078,731,000 | 2,167,979,000
Carrying Amount of Assets Securing Debt Outstanding |  |
Loans | 3,691,024,000 | 2,562,156,000
Restricted Cash | 96,983,000 | 44,617,000
Other assets | 240,369,000 | 160,783,000
Total | 4,028,376,000 | 2,767,556,000
Variable Interest Entity, Primary Beneficiary | Private Education Loan term securitizations |  |
Debt Outstanding |  |
Short-Term | 0 | 0
Long-Term | 3,078,731,000 | 2,167,979,000
Total | 3,078,731,000 | 2,167,979,000
Carrying Amount of Assets Securing Debt Outstanding |  |
Loans | 3,691,024,000 | 2,562,156,000
Restricted Cash | 95,966,000 | 44,617,000
Other assets | 240,208,000 | 160,783,000
Total | 4,027,198,000 | 2,767,556,000
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 | 1,017,000 | 0
Other assets | 161,000 | 0
Total | $ 1,178,000 | $ 0

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