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Multifamily Loans (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Jun. 30, 2020 USD ($) loan | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Multifamily loans deconsolidated |  |  |  | $ 3,850,000 |  |  |
Multifamily loans, 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 | 28 | 279 |  |  |  |  |
Loan principal | $ 465,000 | $ 4,200,000 | $ 465,000 |  |  | $ 465,000 |
Loans, at fair value | $ 489,000 | $ 4,410,000 | $ 489,000 |  |  | $ 489,000 |
Weighted average original loan-to-value (LTV) | 67.00% |  | 67.00% |  |  | 67.00% |
Weighted average coupon rate | 4.25% |  | 4.25% |  |  | 4.25% |
Contract maturities |  |  |  |  |  | 5 years |
Number of loans past due | loan | 0 | 0 | 0 |  |  | 0 |
Number of loans in foreclosure | loan | 0 | 0 | 0 |  |  | 0 |
Net market valuation gain (loss) |  |  | $ 19,000 |  | $ 97,000 | $ (64,000) | $ 131,000
Multifamily loans, held-for-investment, at fair value | Maximum |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Weighted average maturity (in years) |  |  |  |  |  | 10 years |
Held-for-investment at fair value | Redwood |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Number of loans | loan | 0 | 2,940 |  |  |  |  |
Loan principal |  | $ 2,050,000 |  |  |  |  |
Loans, at fair value | $ 0 | $ 2,110,000 | $ 0 |  |  | $ 0 |
Number of loans in foreclosure | loan |  | 0 |  |  |  |  |
Held-for-investment at fair value | 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] |  |  |  |  |  |  |
Loan principal |  | $ 1,000 |  |  |  |  |
Number of loans past due | loan |  | 2 |  |  |  |  |

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