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Consolidated Agency Multifamily Loans (Details) - Consolidated Agency multifamily loans, at fair value $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 USD ($) loan | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) loan | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) loan
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 gains (losses) recorded | $ | $ 2,512 | $ (13,691) | $ 2,200 | $ (40,120) |
Redwood |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans | loan |  |  | 28 |  | 28
Unpaid principal balance | $ | 440,996 |  | $ 440,996 |  | $ 447,193
Fair value of loans | $ | $ 420,554 |  | $ 420,554 |  | $ 424,551
Weighted average coupon (as a percent) | 4.25% |  | 4.25% |  | 4.25%
Weighted average remaining loan term (years) |  |  | 2 years |  | 3 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

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