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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, 2023 USD ($) | Dec. 31, 2022 USD ($)
Consolidated SLST CDOs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Carrying Value | $ 584,741,000 | $ 634,495,000
Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Carrying Value | 584,741,000 | 634,495,000
Consolidated SLST | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Variable interest entity, primary beneficiary, maximum loss exposure, amount | 154,400,000 | 191,500,000
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 2,993,895,000 |
Fair Value | 155,583,000 | 179,746,000
Level 3 | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Carrying Value | 584,741,000 | $ 634,495,000
Level 3 | Valuation Technique, Discounted Cash Flow | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value | 130,583,000 |
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] |  |
Fair Value | $ 5,073,000 |
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] |  |
Equity method investment, 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] |  |
Equity method investment, 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] |  |
Equity method investment, measurement input | 0.139 |
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] |  |
Equity method investment, measurement input | 0.148 |
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Minimum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity method investment, measurement input | 0.130 |
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] |  |
Equity method investment, measurement input | 0.148 |
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Maximum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity method investment, 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] |  |
Equity method investment, measurement input | 0.148 |
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] |  |
Equity method investment, measurement input | 24 |
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] |  |
Equity method investment, measurement input | 13 |
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] |  |
Equity method investment, measurement input | 10 |
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] |  |
Equity method investment, measurement input | 13 |
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] |  |
Equity method investment, measurement input | 56 |
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] |  |
Equity method investment, measurement input | 13 |
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 | $ 2,043,488,000 |
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 | $ 207,803,000 |
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 | 0.041 |
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 | 0.267 |
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 | 0.007 |
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 | 0.243 |
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 | 0.130 |
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 | 1.000 |
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 | 0.080 |
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 | 0.054 |
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 | 0.278 |
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 | 0.069 |
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 | 0.266 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation/(depreciation) | Valuation Technique, 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/(depreciation) | Valuation Technique, Liquidation Model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | (0.008) |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation/(depreciation) | Valuation Technique, Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.058 |
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) | 19 years |
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 years |
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) | 54 years |
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 | $ 2,271,659 |
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 | 9,000 |
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 | 13,750,000 |
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 | $ 98,435,000 |
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 | 0.125 |
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) | 31 years |
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) | 4 years |
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) | 57 years |
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 | $ 742,604,000 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount | 154,400,000 |
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] |  |
Carrying Value | $ 584,741,000 |
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 | 0.216 |
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 | 0.101 |
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 | 0.478 |
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 | 0.065 |
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 | 0.057 |
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 | 0.056 |
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 | 0.024 |
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 | 0.067 |
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 | 0.012 |
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 | 0.016 |

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