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Multifamily Loans (Details) - Multifamily loans, held-for-investment, at fair value $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) loan
Redwood |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans | loan |  |  | 28 |  | 28
Loan principal | $ | $ 457,123 |  | $ 457,123 |  | $ 462,808
Fair value of loans | $ | $ 482,791 |  | $ 482,791 |  | $ 492,221
Weighted average coupon rate | 4.25% |  | 4.25% |  | 4.25%
Contract maturities |  |  | 4 years |  | 5 years
Number of loans in foreclosure | loan | 0 |  | 0 |  | 0
Redwood | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans with 90+ day delinquencies | loan | 0 |  | 0 |  | 0
Held-for-investment at fair value |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Net market valuation gain (loss) | $ | $ (487) | $ 2,340 | $ (3,745) | $ (61,500) |

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