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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, 2023 USD ($) | Dec. 31, 2022 USD ($)
Consolidated SLST CDOs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Carrying Value | $ 638,513,000 | $ 634,495,000
Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Carrying Value | 638,513,000 | 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 | 188,500,000 | 191,500,000
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 3,374,856,000 |
Fair Value | 191,148,000 | 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 | 638,513,000 | $ 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 | 166,148,000 |
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 | $ 10,070,000 |
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 | 0.135 |
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 | 0.160 |
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Minimum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
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 | 0.160 |
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Maximum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
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 | 0.160 |
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] |  |
Equity method investment, measurement input | 20 |
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 | 18 |
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 | 1 |
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 | 18 |
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 | 59 |
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 | 18 |
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 | $ 2,392,768,000 |
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 | $ 152,935,000 |
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 | 0.046 |
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 | 0.349 |
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 | 0.269 |
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 | 0.079 |
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 | 0.966 |
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 | 0.079 |
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 | 0.053 |
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 | 0.920 |
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 | 0.293 |
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 | (0.010) |
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 | 0.052 |
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) | 20 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 | $ 1,931,405 |
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 | 15,300 |
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 | $ 95,309,000 |
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) | 35 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) | 6 months |
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) | 52 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 | $ 829,153,000 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount | 188,500,000 |
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 | $ 638,513,000 |
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 | 0.220 |
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 | 0.023 |
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 | 0.272 |
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 | 0.050 |
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 | 0.043 |
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 | 0.058 |
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 | 0.026 |
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 | 0.015 |
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 | 0.115 |

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