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Business Purpose Residential Loans (Details) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) loan | Sep. 30, 2019 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Proceeds from sales of held-for-sale loans |  |  |  |  | $ 3,224,526,000 | $ 2,971,811,000
Purchases of held-for-sale loans |  |  |  |  | $ 2,893,246,000 | 4,002,509,000
Number of loans transferred | loan |  |  |  |  | 4 |
Transfer to REO |  |  |  |  | $ 12,547,000 | 5,280,000
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 | $ 225,000,000 |  | $ 225,000,000 |  | 225,000,000 |
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] |  |  |  |  |  |
Proceeds from loan originations to third parties |  |  | 2,000,000 |  |  |
Loans, at fair value | $ 285,549,000 | $ 569,185,000 | 285,549,000 |  | 285,549,000 |
Number of loans | loan | 140 | 308 |  |  |  |
Loan principal | $ 272,492,000 | $ 552,848,000 | $ 272,492,000 |  | $ 272,492,000 |
Weighted average coupon rate | 5.26% | 4.96% | 5.26% |  | 5.26% |
Contract maturities | 7 years | 9 years |  |  |  |
Fair value of loans with 90+ day delinquencies | $ 0 | $ 130,000 | $ 0 |  | $ 0 |
Number of loans in foreclosure | loan | 0 | 1 | 0 |  | 0 |
Fair value of loans, in foreclosure | $ 0 | $ 130,000 | $ 0 |  | $ 0 |
Purchases of held-for-sale loans |  |  | 196,000,000 |  | 632,000,000 |
Gain (loss) on investments |  |  | 43,000,000 | $ 1,000,000 | 34,000,000 | 3,000,000
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 |
Residential Bridge, Held-for-investment at fair value |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans, at fair value | $ 700,860,000 | $ 745,006,000 | 700,860,000 |  | 700,860,000 |
Number of loans | loan | 2,262 | 2,653 |  |  |  |
Loan principal | $ 708,555,000 | $ 742,528,000 | $ 708,555,000 |  | $ 708,555,000 |
Weighted average coupon rate | 8.02% | 8.11% | 8.02% |  | 8.02% |
Contract maturities | 1 year | 2 years |  |  |  |
Fair value of loans with 90+ day delinquencies | $ 39,755,000 | $ 8,987,000 | $ 39,755,000 |  | $ 39,755,000 |
Number of loans in foreclosure | loan | 24 | 15 | 24 |  | 24 |
Fair value of loans, in foreclosure | $ 34,489,000 | $ 6,917,000 | $ 34,489,000 |  | $ 34,489,000 |
Purchases of held-for-sale loans |  |  | 64,000,000 |  | 324,000,000 |
Gain (loss) on investments |  |  | 7,000,000 | (1,000,000) | (10,000,000) | (1,000,000)
Transfer to REO |  |  |  |  | $ 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] |  |  |  |  |  |
Residential bridge loans held-for-investment, original maturities (in months) |  |  |  |  | 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] |  |  |  |  |  |
Residential bridge loans held-for-investment, original maturities (in months) |  |  |  |  | 24 months |
Residential bridge loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Proceeds from loan originations to third parties |  |  | 2,000,000 |  |  |
Loans, at fair value | 700,860,000 | 745,006,000 | 700,860,000 |  | $ 700,860,000 |
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 | 285,549,000 | 331,565,000 | 285,549,000 |  | 285,549,000 |
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 | 3,670,552,000 | 3,175,178,000 | 3,670,552,000 |  | 3,670,552,000 |
Business purpose residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Proceeds from loan originations |  |  | 261,000,000 |  |  |
Fee income |  |  | 3,000,000 |  | 13,000,000 |
Loans, at fair value | $ 3,956,101,000 | $ 3,506,743,000 | 3,956,101,000 |  | 3,956,101,000 |
Business Purpose Mortgage Banking Activities |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Market valuations gains (losses), net |  |  | 938,000 | $ 1,010,000 | (4,256,000) | $ 2,108,000
Business Purpose Mortgage Banking Activities | 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] |  |  |  |  |  |
Gain (loss) on investments |  |  |  |  | 55,000,000 |
Business Purpose Mortgage Banking Activities | Business purpose residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Market valuations gains (losses), net |  |  | $ 100,000 |  |  |
Business Purpose Investment Fair Value Change | 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] |  |  |  |  |  |
Gain (loss) on investments |  |  |  |  | $ 21,000,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due | 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 past due | loan | 6 | 2 | 6 |  | 6 |
Fair value of loans with 90+ day delinquencies | $ 3,018,000 | $ 1,688,000 | $ 3,018,000 |  | $ 3,018,000 |
Balance of loans 90 days or more delinquent | $ 2,954,000 | $ 1,818,000 | $ 2,954,000 |  | $ 2,954,000 |
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] |  |  |  |  |  |
Number of loans past due | loan | 24 | 31 | 24 |  | 24 |
Fair value of loans with 90+ day delinquencies | $ 38,437,000 | $ 14,186,000 | $ 38,437,000 |  | $ 38,437,000 |
Balance of loans 90 days or more delinquent | 33,464,000 | 12,111,000 | 33,464,000 |  | 33,464,000 |
Redwood | 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] |  |  |  |  |  |
Loans, at fair value | 285,549,000 | 331,565,000 | 285,549,000 |  | 285,549,000 |
Redwood | Single-family rental loans held-for-investment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans, at fair value | 0 | 237,620,000 | 0 |  | 0 |
Redwood | Single family rental loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans, at fair value | 285,549,000 | 569,185,000 | 285,549,000 |  | 285,549,000 |
CoreVest | 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] |  |  |  |  |  |
Loans, at fair value | 0 | 0 | 0 |  | 0 |
CoreVest | Single-family rental loans held-for-investment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans, at fair value | 2,969,692,000 | 2,192,552,000 | 2,969,692,000 |  | 2,969,692,000 |
CoreVest | Single family rental loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans, at fair value | $ 2,969,692,000 | 2,192,552,000 | $ 2,969,692,000 |  | 2,969,692,000 |
CAFL | 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] |  |  |  |  |  |
Proceeds from sales of held-for-sale loans |  |  |  |  | 34,000,000 |
Purchases of held-for-sale loans |  |  |  |  | $ 925,000,000 |
Number of securitization entities to which asset transferred (in entities) | loan | 3 |  | 3 |  | 3 |
CAFL | Single-family rental loans held-for-investment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans, at fair value | $ 2,969,692,000 | $ 2,192,552,000 | $ 2,969,692,000 |  | $ 2,969,692,000 |
Number of loans | loan | 1,027 | 783 |  |  |  |
Loan principal | $ 2,815,045,000 | $ 2,078,214,000 | $ 2,815,045,000 |  | $ 2,815,045,000 |
Weighted average coupon rate | 5.50% | 5.70% | 5.50% |  | 5.50% |
Contract maturities | 6 years | 7 years |  |  |  |
Fair value of loans with 90+ day delinquencies | $ 14,032,000 | $ 9,169,000 | $ 14,032,000 |  | $ 14,032,000 |
Number of loans in foreclosure | loan | 9 | 5 | 9 |  | 9 |
Gain (loss) on investments |  |  | $ 88,000,000 |  | $ (14,000,000) |
Loans maturity one |  |  |  |  | 5 years |
Loans maturity two |  |  |  |  | 7 years |
Loans maturity three |  |  |  |  | 10 years |
CAFL | Financing Receivables, Equal to Greater than 90 Days Past Due | Single-family rental loans held-for-investment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Number of loans past due | loan | 26 | 18 | 26 |  | 26 |
Fair value of loans with 90+ day delinquencies | $ 70,949,000 | $ 29,039,000 | $ 70,949,000 |  | $ 70,949,000 |

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