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Borrowings - Secured Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Secured borrowings: |  |
Short-Term | $ 500,175 |
Long-Term | 579,101 | $ 0
Total | 1,079,276 |
Private Education Loan term securitizations |  |
Secured borrowings: |  |
Short-Term | 0 |
Long-Term | 579,101 |
Total | 579,101 |
ABCP borrowings |  |
Secured borrowings: |  |
Short-Term | 500,175 |
Long-Term | 0 |
Total | $ 500,175 |

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