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Multifamily Loans (Details) - Multifamily loans, held-for-investment, at fair value $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) loan | Mar. 31, 2021 USD ($) | Dec. 31, 2021 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 | $ | $ 453,140 |  | $ 455,168
Fair value of loans | $ | $ 451,804 |  | $ 473,514
Weighted average coupon rate (as a percent) | 4.25% |  | 4.25%
Contract maturities | 3 years |  | 4 years
Number of loans in foreclosure | loan | 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
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) | $ | $ (19,681) | $ (730) |

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