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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, 2022 USD ($) | Dec. 31, 2021 USD ($)
Consolidated SLST CDOs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | $ 660,069,000 | $ 839,419,000
Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | 660,069,000 | 839,419,000
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 | 198,800,000 | 230,300,000
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 3,933,176,000 |
Equity investments | 205,814,000 | 239,631,000
Level 3 | Consolidated SLST CDOs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | 660,069,000 | $ 839,419,000
Level 3 | Valuation Technique, Discounted Cash Flow | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity investments | 176,339,000 |
Level 3 | Valuation Technique, Discounted Cash Flow | Equity investments in disposal group held for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity investments | $ 9,936,000 |
Level 3 | Loss severity | Valuation Technique, 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 | Loss severity | Valuation Technique, Discounted Cash Flow | Weighted Average | Equity investments in disposal group held for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0 |
Level 3 | Discount rate | Valuation Technique, 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 | 0.133 |
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Weighted Average | Equity investments in disposal group held for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.160 |
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Minimum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.120 |
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Minimum | Equity investments in disposal group held for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.160 |
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Maximum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.155 |
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Maximum | Equity investments in disposal group held for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.160 |
Level 3 | Months to assumed redemption | Valuation Technique, 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) | 21 months |
Level 3 | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Weighted Average | Equity investments in disposal group held for sale |  |
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 | Valuation Technique, 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 | Valuation Technique, Discounted Cash Flow | Minimum | Equity investments in disposal group held for sale |  |
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 | Valuation Technique, 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) | 37 months |
Level 3 | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Maximum | Equity investments in disposal group held for sale |  |
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 | Residential loans and residential loans held in securitization trusts | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 2,949,261,000 |
Level 3 | Residential loans and residential loans held in securitization trusts | Valuation Technique, Liquidation Model |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 123,130,000 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Valuation Technique, Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.039 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Valuation Technique, 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 | Valuation Technique, Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.356 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.004 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Valuation Technique, 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 | Valuation Technique, Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.214 |
Level 3 | Residential loans and residential loans held in securitization trusts | Loss severity | Valuation Technique, Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.069 |
Level 3 | Residential loans and residential loans held in securitization trusts | Loss severity | Valuation Technique, 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 | Valuation Technique, Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.965 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.072 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Discounted Cash Flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.055 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.953 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Liquidation Model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.076 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, 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 | Valuation Technique, Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.267 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation | Valuation Technique, Liquidation Model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.004 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation | Valuation Technique, 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 | Valuation Technique, Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.086 |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | Valuation Technique, 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) | 22 months |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | Valuation Technique, 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 (months) | Valuation Technique, Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, liquidation timeline (in months) | 50 months |
Level 3 | Residential loans and residential loans held in securitization trusts | Property value | Valuation Technique, Liquidation Model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 1,712,179 |
Level 3 | Residential loans and residential loans held in securitization trusts | Property value | Valuation Technique, Liquidation Model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 14,920 |
Level 3 | Residential loans and residential loans held in securitization trusts | Property value | Valuation Technique, Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 13,800,000 |
Level 3 | Multi-family loans | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Multi-family loans | $ 95,829,000 |
Level 3 | Multi-family loans | Loss severity | Valuation Technique, 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 | Valuation Technique, 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 | Multi-family loans | Discount rate | Valuation Technique, 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 | Valuation Technique, Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.205 |
Level 3 | Multi-family loans | Months to assumed redemption | Valuation Technique, 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) | 36 months |
Level 3 | Multi-family loans | Months to assumed redemption | Valuation Technique, 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 | Valuation Technique, Discounted Cash Flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, assumed redemption period (in months) | 55 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 | $ 860,785,000 |
Investment in Consolidated SLST limited to securities owned, net carrying value | 198,800,000 |
Level 3 | Consolidated SLST | Valuation Technique, Discounted Cash Flow | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | $ 660,069,000 |
Level 3 | Consolidated SLST | Loss severity | Valuation Technique, Discounted Cash Flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.163 |
Level 3 | Consolidated SLST | Loss severity | Valuation Technique, Discounted Cash Flow | Minimum | Consolidated SLST CDOs | 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 | Valuation Technique, Discounted Cash Flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.185 |
Level 3 | Consolidated SLST | Yield | Valuation Technique, Discounted Cash Flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.056 |
Level 3 | Consolidated SLST | Yield | Valuation Technique, Discounted Cash Flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.046 |
Level 3 | Consolidated SLST | Yield | Valuation Technique, Discounted Cash Flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.100 |
Level 3 | Consolidated SLST | Collateral prepayment rate | Valuation Technique, Discounted Cash Flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.081 |
Level 3 | Consolidated SLST | Collateral prepayment rate | Valuation Technique, Discounted Cash Flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.031 |
Level 3 | Consolidated SLST | Collateral prepayment rate | Valuation Technique, Discounted Cash Flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.098 |
Level 3 | Consolidated SLST | Collateral default rate | Valuation Technique, Discounted Cash Flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.016 |
Level 3 | Consolidated SLST | Collateral default rate | Valuation Technique, Discounted Cash Flow | Minimum | Consolidated SLST CDOs | 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 | Valuation Technique, Discounted Cash Flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.102 |

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