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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) | 3 Months Ended |
--- | --- | ---
Mar. 31, 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 | $ 1,034,992,000 | 1,052,829,000
Investment in unconsolidated entities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities | 85,100,000 | 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 | 179,292,000 |
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 2,776,630,000 |
Investments in unconsolidated entities | 211,965,000 | 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 | 1,034,992,000 | 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 | 126,865,000 |
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 | $ 1,034,992,000 |
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 | 0.222 |
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 | 0.001 |
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 | 0.244 |
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 | 0.040 |
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 | 0.027 |
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 | 0.149 |
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 | 0.124 |
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) | 46 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) | 21 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) | 59 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 | 0.057 |
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 | 0.038 |
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 | 0.062 |
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 | 0.027 |
Level 3 | Residential loans and residential loans held in securitization trusts | Discounted Cash Flow |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 1,390,197,000 |
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 | 0.553 |
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 | 0.015 |
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 | 0.230 |
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 | 0.164 |
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 | 0.061 |
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 | 0.028 |
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 | 0.170 |
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 | 0.075 |
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 | 0.075 |
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 | 0.150 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual Home Price Appreciation | Liquidation Model |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 168,134,000 |
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 | 0.002 |
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 | 0.056 |
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) | 28 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 | $ 482,658 |
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 | 2,500 |
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 | 3,400,000 |
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 | $ 179,292,000 |
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 | 0.122 |
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 | 0.135 |
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) | 48 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) | 10 months |
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) | 189 months |
Consolidated SLST | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt obligations | $ 1,034,992,000 | 1,052,829,000
Investment in Consolidated SLST limited to securities owned, net carrying value | 182,800,000 | 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 | 1,218,299,000 | $ 1,328,886,000
Investment in Consolidated SLST limited to securities owned, net carrying value | $ 182,800,000 |

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