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Borrowings - Securitizations (Details) - USD ($) | Feb. 28, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | May 31, 2016 | Jul. 31, 2015 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Total Issued |  |  |  |  |  | $ 772,000,000 | $ 1,782,000,000 | $ 630,800,000
Total loan and accrued interest amount securitized at inception on-balance sheet term securitization |  |  |  |  |  | $ 856,253,000 | $ 2,107,042,000 | $ 745,580,000
2015-B |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Total Issued |  |  |  |  | $ 630,800,000 |  |  |
Weighted Average Life (in years) |  |  |  |  | 4 years 9 months 26 days |  |  |
2016-A |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Total Issued |  |  |  | $ 501,000,000 |  |  |  |
Weighted Average Life (in years) |  |  |  | 4 years 3 days |  |  |  |
2016-B |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Total Issued |  |  | $ 607,000,000 |  |  |  |  |
Weighted Average Life (in years) |  |  | 4 years 3 days |  |  |  |  |
2016-C |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Total Issued |  | $ 674,000,000 |  |  |  |  |  |
Weighted Average Life (in years) |  | 4 years 3 months 7 days |  |  |  |  |  |
2017-A |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Total Issued | $ 772,000,000 |  |  |  |  |  |  |
Weighted Average Life (in years) | 4 years 3 months 7 days |  |  |  |  |  |  |
LIBOR | 2015-B |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.53% |  |  |
LIBOR | 2016-A |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.38% |  |  |  |
LIBOR | 2016-B |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.36% |  |  |  |  |
LIBOR | 2016-C |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.15% |  |  |  |  |  |
LIBOR | 2017-A |  |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.93% |  |  |  |  |  |  |

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