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Business Purpose Loans (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Purchases of held-for-sale loans |  | $ 5,596,326,000 | $ 3,760,110,000 |
Proceeds from sales of held-for-sale loans |  | 4,097,211,000 | $ 3,079,877,000 |
Business purpose loans, at fair value |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Residential loans | $ 115,620,000 | $ 115,620,000 |  | $ 0
Single-family rental loans, held-for-sale at fair value |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan |  | 4 |  |
Loan Principal | 20,000,000 | $ 20,000,000 |  |
Residential loans | $ 20,105,000 | $ 20,105,000 |  | 0
Number of loans past due | loan | 0 | 0 |  |
Number of loans in foreclosure | loan | 0 | 0 |  |
Purchases of held-for-sale loans | $ 20,000,000 | $ 20,000,000 |  |
Proceeds from sales of held-for-sale loans | 0 | 0 |  |
Gain (loss) on investments | (100,000) | (100,000) |  |
Collateral amounts | $ 20,000,000 | $ 20,000,000 |  |
Weighted average coupon rate | 5.71% | 5.71% |  |
Weighted average original loan-to-value (LTV) | 65.00% | 65.00% |  |
Weighted-average debt service coverage ratio |  | 1.25 |  |
Contract maturities |  | 7 years |  |
Fix and flip loan warehouse |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Collateral amounts | $ 92,000,000 | $ 92,000,000 |  |
Fix-and-flip loans held-for-investment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan |  | 128 |  |
Loan Principal | 95,000,000 | $ 95,000,000 |  |
Residential loans | $ 95,515,000 | $ 95,515,000 |  | $ 0
Number of loans past due | loan | 2 | 2 |  |
Purchases of held-for-sale loans | $ 106,000,000 |  |  |
Proceeds from sales of held-for-sale loans | 0 | $ 0 |  |
Gain (loss) on investments | $ 100,000 | $ 100,000 |  |
Weighted average coupon rate | 9.14% | 9.14% |  |
Weighted average original loan-to-value (LTV) | 76.00% | 76.00% |  |
Weighted average original Fair Isaac Corporation (FICO) score | 718 | 718 |  |
Unpaid principal balance on delinquent or foreclosure loans | $ 1,000,000 | $ 1,000,000 |  |
Estimated rehabilitated loan-to-value ratio | 57.00% | 57.00% |  |
Fix-and-flip loans held-for-investment | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Contract maturities |  | 6 months |  |
Fix-and-flip loans held-for-investment | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Contract maturities |  | 24 months |  |

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