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Borrowings - Securitizations (Details) - USD ($) $ in Thousands | Jul. 30, 2015 | Dec. 31, 2015
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Securities Financing Transaction [Line Items] |  |
Total bonds issued |  | $ 630,800
Total loan amount securitized at inception of the above on-balance sheet term securitization |  | $ 745,580
2015-B |  |
Securities Financing Transaction [Line Items] |  |
Total bonds issued | $ 630,800 |
Weighted Average Life | 4 years 9 months 26 days |
LIBOR | 2015-B |  |
Securities Financing Transaction [Line Items] |  |
Basis spread on variable rate | 1.53% |

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