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Fair Value of Financial Instruments - Schedule of Quantitative Information Regarding Significant and Unobservable Inputs Used in the Valuation of Level 3 Assets and Liabilities Measured at Fair Value (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Preferred equity and mezzanine loan investments |  | $ 180,045,000
Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt obligations | $ 1,077,980,000 | 1,052,829,000
Investment in unconsolidated entities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities | 73,456,000 | 83,882,000
Preferred equity and mezzanine loan investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Preferred equity and mezzanine loan investments | 183,154,000 |
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 2,822,789,000 |
Investments in unconsolidated entities | 218,706,000 | 191,359,000
Level 3 | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt obligations | 1,077,980,000 | 1,052,829,000
Level 3 | Investment in unconsolidated entities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities | 145,250,000 |
Level 3 | VIE, Primary Beneficiary | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt obligations | $ 1,077,980,000 |
Level 3 | Loss Severity | Discounted Cash Flow | Weighted Average | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.211 |
Level 3 | Loss Severity | Discounted Cash Flow | Minimum | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0 |
Level 3 | Loss Severity | Discounted Cash Flow | Maximum | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.237 |
Level 3 | Yield | Discounted Cash Flow | Weighted Average | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.023 |
Level 3 | Yield | Discounted Cash Flow | Minimum | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.012 |
Level 3 | Yield | Discounted Cash Flow | Maximum | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.115 |
Level 3 | Discount Rate | Discounted Cash Flow | Weighted Average | Investment in unconsolidated entities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.125 |
Level 3 | Discount Rate | Discounted Cash Flow | Minimum | Investment in unconsolidated entities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.120 |
Level 3 | Discount Rate | Discounted Cash Flow | Maximum | Investment in unconsolidated entities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.135 |
Level 3 | Months To Assumed Redemption | Discounted Cash Flow | Weighted Average | Investment in unconsolidated entities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, redemption period (in months) | 42 months |
Level 3 | Months To Assumed Redemption | Discounted Cash Flow | Minimum | Investment in unconsolidated entities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, redemption period (in months) | 18 months |
Level 3 | Months To Assumed Redemption | Discounted Cash Flow | Maximum | Investment in unconsolidated entities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, redemption period (in months) | 56 months |
Level 3 | Collateral Prepayment Rate | Discounted Cash Flow | Weighted Average | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.055 |
Level 3 | Collateral Prepayment Rate | Discounted Cash Flow | Minimum | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.028 |
Level 3 | Collateral Prepayment Rate | Discounted Cash Flow | Maximum | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.061 |
Level 3 | Collateral Default Rate | Discounted Cash Flow | Weighted Average | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.020 |
Level 3 | Collateral Default Rate | Discounted Cash Flow | Minimum | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0 |
Level 3 | Collateral Default Rate | Discounted Cash Flow | Maximum | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.068 |
Level 3 | Residential loans and residential loans held in securitization trusts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 1,397,090,000 |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation Model |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 135,694,000 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.096 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Discounted Cash Flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.676 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.026 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Discounted Cash Flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 1.000 |
Level 3 | Residential loans and residential loans held in securitization trusts | Loss Severity | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.163 |
Level 3 | Residential loans and residential loans held in securitization trusts | Loss Severity | Discounted Cash Flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0 |
Level 3 | Residential loans and residential loans held in securitization trusts | Loss Severity | Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 1.000 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.053 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Discounted Cash Flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.023 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.350 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Liquidation Model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.071 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Liquidation Model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.070 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.350 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual Home Price Appreciation | Liquidation Model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.001 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual Home Price Appreciation | Liquidation Model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual Home Price Appreciation | Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.057 |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation Timeline | Liquidation Model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, liquidation timeline (in months) | 29 months |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation Timeline | Liquidation Model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, liquidation timeline (in months) | 1 month |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation Timeline | Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, liquidation timeline (in months) | 57 months |
Level 3 | Residential loans and residential loans held in securitization trusts | Property Value | Liquidation Model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 572,723 |
Level 3 | Residential loans and residential loans held in securitization trusts | Property Value | Liquidation Model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 12,430 |
Level 3 | Residential loans and residential loans held in securitization trusts | Property Value | Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 3,550,000 |
Level 3 | Preferred equity and mezzanine loan investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Preferred equity and mezzanine loan investments | $ 183,154,000 |
Level 3 | Preferred equity and mezzanine loan investments | Discount Rate | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.124 |
Level 3 | Preferred equity and mezzanine loan investments | Discount Rate | Discounted Cash Flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.115 |
Level 3 | Preferred equity and mezzanine loan investments | Discount Rate | Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.160 |
Level 3 | Preferred equity and mezzanine loan investments | Months To Assumed Redemption | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, assumed redemption period (in months) | 45 months |
Level 3 | Preferred equity and mezzanine loan investments | Months To Assumed Redemption | Discounted Cash Flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, assumed redemption period (in months) | 1 month |
Level 3 | Preferred equity and mezzanine loan investments | Months To Assumed Redemption | Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, assumed redemption period (in months) | 186 months |
Consolidated SLST | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt obligations | $ 1,077,980,000 | 1,052,829,000
Investment in Consolidated SLST limited to securities owned, net carrying value | 210,900,000 | 276,800,000
Consolidated SLST | Level 3 | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 1,290,005,000 | $ 1,328,886,000
Investment in Consolidated SLST limited to securities owned, net carrying value | $ 210,900,000 |

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