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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)
 6 Months Ended
Jun. 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 $ 948,090,000 $ 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 948,090,000 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 228,300,000 212,100,000
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value 3,202,743,000  
Equity investments 204,697,000 259,095,000
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 948,090,000 $ 1,054,335,000
Level 3 | Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity investments $ 189,746,000  
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 0.117  
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) 35 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) 3 months  
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) 57 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 $ 1,891,087,000  
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 $ 135,117,000  
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 0.547  
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 0.008  
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 0.203  
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 0.118  
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 0.049  
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 0.402  
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 0.072  
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 0.296  
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 0.010  
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 0.180  
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 years  
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) 8 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 $ 608,523  
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 13,000  
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 4,000,000  
Level 3 | Multi-family loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Multi-family loans $ 126,719,000  
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) 35 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 $ 1,176,539,000  
Investment in Consolidated SLST limited to securities owned, net carrying value 228,300,000  
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 $ 948,090,000  
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 0.194  
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 0.221  
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 0.028  
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 0.019  
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 0.216  
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 0.055  
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 0.024  
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 0.062  
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 0.020  
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 0.086