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Business Purpose Residential Loans (Details) |  |  | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Feb. 28, 2019 USD ($) | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) loan | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Purchases of held-for-sale loans |  |  |  |  |  |  | $ 4,002,509,000 | $ 5,596,326,000
Proceeds from sales of held-for-sale loans |  |  |  |  |  |  | $ 2,971,811,000 | 4,097,211,000
Number of loans transferred | loan |  |  |  |  |  |  | 1 |
Transfer to REO |  |  |  |  |  |  | $ 5,280,000 | 2,139,000
Commitment To Fund Residential Bridge Loan |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Commitment to fund loan | $ 67,000,000 |  |  | $ 67,000,000 |  | $ 67,000,000 | 67,000,000 |
Total Business Purpose Residential Loans |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Proceeds from loan originations |  |  |  | 127,000,000 |  |  |  |
Proceeds from loan originations to third parties |  |  |  | 3,000,000 |  |  |  |
Market valuations gains and losses, net |  |  |  | 1,000,000 |  |  |  |
Fee income |  |  |  | 3,000,000 |  | 6,000,000 |  |
Loans, at fair value | $ 336,035,000 | $ 141,258,000 |  | 336,035,000 |  | 336,035,000 | 336,035,000 |
Single-Family Rental, 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 | 77 | 11 |  |  |  |  |  |
Loan principal | $ 106,000,000 | $ 28,000,000 |  | 106,000,000 |  | 106,000,000 | 106,000,000 |
Loans, at fair value | $ 110,434,000 | $ 28,460,000 |  | $ 110,434,000 |  | $ 110,434,000 | $ 110,434,000 |
Number of loans past due | loan | 0 | 0 |  | 0 |  | 0 | 0 |
Purchases of held-for-sale loans |  |  | $ 19,000,000 | $ 36,000,000 |  | $ 78,000,000 |  |
Proceeds from sales of held-for-sale loans |  |  |  | 0 |  | 0 |  |
Gain (loss) on investments |  |  |  | 1,000,000 |  |  | $ 3,000,000 |
Collateral amounts | $ 78,000,000 | $ 28,000,000 |  | $ 78,000,000 |  | $ 78,000,000 | $ 78,000,000 |
Weighted average coupon rate | 5.35% |  |  | 5.35% |  | 5.35% | 5.35% |
Contract maturities |  |  |  |  |  |  | 6 years |
Weighted average original loan-to-value (LTV) | 68.00% |  |  | 68.00% |  | 68.00% | 68.00% |
Weighted-average debt service coverage ratio |  |  |  |  |  |  | 1.36 |
Number of loans in foreclosure | loan |  | 0 |  |  |  |  |  |
Residential Bridge, Held-for-sale at fair value |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Loans, at fair value | $ 0 | $ 0 |  | $ 0 |  | $ 0 | $ 0 |
Held-for-sale at fair value, Total |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Loans, at fair value | $ 110,434,000 | 28,460,000 |  | 110,434,000 |  | 110,434,000 | 110,434,000 |
Single-Family Rental, Held-for-investment at fair value |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of loans | loan | 1 |  |  |  |  |  |  |
Loan principal | $ 17,000,000 |  |  | 17,000,000 |  | 17,000,000 | 17,000,000 |
Loans, at fair value | $ 18,711,000 | $ 0 |  | 18,711,000 |  | 18,711,000 | 18,711,000 |
Transfer from Investments |  |  |  | 19,000,000 |  |  |  |
Residential Bridge, Held-for-investment at fair value |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of loans | loan | 392 | 157 |  |  |  |  |  |
Loan principal | $ 205,000,000 | $ 112,000,000 |  | 205,000,000 |  | 205,000,000 | 205,000,000 |
Loans, at fair value | 206,890,000 | $ 112,798,000 |  | 206,890,000 |  | 206,890,000 | 206,890,000 |
Number of loans past due | loan |  | 7 |  |  |  |  |  |
Purchases of held-for-sale loans |  |  | $ 10,000,000 | 88,000,000 |  | 174,000,000 |  |
Gain (loss) on investments |  |  |  | (1,000,000) |  |  |  |
Collateral amounts | $ 176,000,000 | $ 98,000,000 |  | $ 176,000,000 |  | $ 176,000,000 | $ 176,000,000 |
Weighted average coupon rate | 8.90% |  |  | 8.90% |  | 8.90% | 8.90% |
Weighted average original loan-to-value (LTV) | 70.00% |  |  | 70.00% |  | 70.00% | 70.00% |
Unpaid principal balance on delinquent or foreclosure loans |  | $ 12,000,000 |  |  |  |  |  |
Number of loans in foreclosure | loan | 8 | 4 |  | 8 |  | 8 | 8 |
Loans in foreclosure amount | $ 5,000,000 | $ 11,000,000 |  | $ 5,000,000 |  | $ 5,000,000 | $ 5,000,000 |
Transfer to REO |  |  |  |  |  |  | $ 5,000,000 |
Weighted average original Fair Isaac Corporation (FICO) score | 693 |  |  | 693 |  | 693 | 693 |
Amount of loans in foreclosure | $ 5,000,000 |  |  | $ 5,000,000 |  | $ 5,000,000 | $ 5,000,000 |
Residential Bridge, Held-for-investment at fair value | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Contract maturities |  |  |  |  |  |  | 6 months |
Residential Bridge, Held-for-investment at fair value | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Contract maturities |  |  |  |  |  |  | 24 months |
Held-for-investment at fair value, Total |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Loans, at fair value | 225,601,000 | 112,798,000 |  | 225,601,000 |  | 225,601,000 | $ 225,601,000 |
Total of single family rental |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Loans, at fair value | 129,145,000 | 28,460,000 |  | 129,145,000 |  | 129,145,000 | 129,145,000 |
Total residential bridge loans |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Loans, at fair value | 206,890,000 | $ 112,798,000 |  | 206,890,000 |  | 206,890,000 | 206,890,000 |
Business Purpose Mortgage Banking Activities, Net |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Market valuations gains and losses, net |  |  |  | 1,010,000 | $ 0 |  | 2,108,000 | $ 0
Total Business Purpose Residential Loans |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Proceeds from loan originations |  |  |  |  |  | 297,000,000 |  |
Proceeds from loan originations to third parties |  |  |  |  |  | 47,000,000 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Bridge, Held-for-investment at fair value |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Loan principal | $ 6,000,000 |  |  | $ 6,000,000 |  | $ 6,000,000 | $ 6,000,000 |
Number of loans past due | loan | 9 |  |  | 9 |  | 9 | 9 |
Unpaid principal balance on delinquent or foreclosure loans | $ 6,000,000 |  |  | $ 6,000,000 |  | $ 6,000,000 | $ 6,000,000 |

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