Residential Mortgage Loans Held-for-Investment in Securitization Trusts, at Fair Value (Details) - USD ($) $ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Residential Mortgage Loans Held-for-Invesment, Unpaid Principal | $ 3,499,285 | $ 3,143,515 |
| Residential Mortgage Loans Held-for-Investment, Fair Value Adjustment | 120,752 | 30,212 |
| Residential mortgage loans held-for-investment in securitization trusts, at fair value | $ 3,620,037 | $ 3,173,727 |