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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, 2021 USD ($) | Dec. 31, 2020 USD ($)
Residential Collateralized Debt Obligations, at Fair Value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | $ 904,976,000 | $ 1,054,335,000
Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | 904,976,000 | 1,054,335,000
Consolidated SLST | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment in Consolidated SLST limited to securities owned, net carrying value | 231,100,000 | 212,100,000
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 3,273,807,000 |
Equity investments | 255,014,000 | 259,095,000
Level 3 | Residential Collateralized Debt Obligations, at Fair Value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | 904,976,000 | $ 1,054,335,000
Level 3 | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity investments | $ 237,925,000 |
Level 3 | Loss Severity | Discounted Cash Flow | Weighted Average | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0 |
Level 3 | Discount Rate | Discounted Cash Flow | Weighted Average | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.119 |
Level 3 | Discount Rate | Discounted Cash Flow | Minimum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.110 |
Level 3 | Discount Rate | Discounted Cash Flow | Maximum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.183 |
Level 3 | Months To Assumed Redemption | Discounted Cash Flow | Weighted Average | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, redemption period (in months) | 26 months |
Level 3 | Months To Assumed Redemption | Discounted Cash Flow | Minimum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, redemption period (in months) | 1 month |
Level 3 | Months To Assumed Redemption | Discounted Cash Flow | Maximum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, redemption period (in months) | 60 months |
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 | $ 2,044,724,000 |
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 | $ 92,078,000 |
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 | 0.085 |
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 | 0.513 |
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 | 0.007 |
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 | 0.287 |
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 | 0.104 |
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 | 0.048 |
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 | 0.024 |
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 | 0.487 |
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 | 0.280 |
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 | 0.014 |
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 | 0.254 |
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) | 30 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) | 9 months |
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) | 53 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 | $ 720,766 |
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 | 15,000 |
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 | 6,500,000 |
Level 3 | Multi-family loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Multi-family loans | $ 119,812,000 |
Level 3 | Multi-family loans | Loss Severity | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0 |
Level 3 | Multi-family loans | Discount Rate | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.115 |
Level 3 | Multi-family loans | Discount Rate | Discounted Cash Flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.110 |
Level 3 | Multi-family loans | Discount Rate | Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.195 |
Level 3 | Multi-family loans | 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) | 23 months |
Level 3 | Multi-family loans | 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 | Multi-family loans | 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) | 60 months |
Level 3 | Consolidated SLST | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 1,137,005,000 |
Investment in Consolidated SLST limited to securities owned, net carrying value | 231,100,000 |
Level 3 | Consolidated SLST | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | $ 904,976,000 |
Level 3 | Consolidated SLST | Loss Severity | Discounted Cash Flow | Weighted Average | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.187 |
Level 3 | Consolidated SLST | Loss Severity | Discounted Cash Flow | Minimum | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0 |
Level 3 | Consolidated SLST | Loss Severity | Discounted Cash Flow | Maximum | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.212 |
Level 3 | Consolidated SLST | Yield | Discounted Cash Flow | Weighted Average | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.026 |
Level 3 | Consolidated SLST | Yield | Discounted Cash Flow | Minimum | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.015 |
Level 3 | Consolidated SLST | Yield | Discounted Cash Flow | Maximum | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.233 |
Level 3 | Consolidated SLST | Collateral Prepayment Rate | Discounted Cash Flow | Weighted Average | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.057 |
Level 3 | Consolidated SLST | Collateral Prepayment Rate | Discounted Cash Flow | Minimum | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.025 |
Level 3 | Consolidated SLST | Collateral Prepayment Rate | Discounted Cash Flow | Maximum | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.064 |
Level 3 | Consolidated SLST | Collateral Default Rate | Discounted Cash Flow | Weighted Average | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.018 |
Level 3 | Consolidated SLST | Collateral Default Rate | Discounted Cash Flow | Minimum | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0 |
Level 3 | Consolidated SLST | Collateral Default Rate | Discounted Cash Flow | Maximum | Residential Collateralized Debt Obligations, at Fair Value | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.094 |

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