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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, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Preferred equity and mezzanine loan investments   $ 180,045,000
Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt obligations $ 1,077,980,000 1,052,829,000
Investment in unconsolidated entities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments in unconsolidated entities 73,456,000 83,882,000
Preferred equity and mezzanine loan investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Preferred equity and mezzanine loan investments 183,154,000  
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value 2,822,789,000  
Investments in unconsolidated entities 218,706,000 191,359,000
Level 3 | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt obligations 1,077,980,000 1,052,829,000
Level 3 | Investment in unconsolidated entities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments in unconsolidated entities 145,250,000  
Level 3 | VIE, Primary Beneficiary | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt obligations $ 1,077,980,000  
Level 3 | Loss Severity | Discounted Cash Flow | Weighted Average | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.211  
Level 3 | Loss Severity | Discounted Cash Flow | Minimum | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0  
Level 3 | Loss Severity | Discounted Cash Flow | Maximum | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.237  
Level 3 | Yield | Discounted Cash Flow | Weighted Average | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.023  
Level 3 | Yield | Discounted Cash Flow | Minimum | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.012  
Level 3 | Yield | Discounted Cash Flow | Maximum | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.115  
Level 3 | Discount Rate | Discounted Cash Flow | Weighted Average | Investment in unconsolidated entities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments in unconsolidated entities, measurement input 0.125  
Level 3 | Discount Rate | Discounted Cash Flow | Minimum | Investment in unconsolidated entities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments in unconsolidated entities, measurement input 0.120  
Level 3 | Discount Rate | Discounted Cash Flow | Maximum | Investment in unconsolidated entities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments in unconsolidated entities, measurement input 0.135  
Level 3 | Months To Assumed Redemption | Discounted Cash Flow | Weighted Average | Investment in unconsolidated entities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input, redemption period (in months) 42 months  
Level 3 | Months To Assumed Redemption | Discounted Cash Flow | Minimum | Investment in unconsolidated entities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input, redemption period (in months) 18 months  
Level 3 | Months To Assumed Redemption | Discounted Cash Flow | Maximum | Investment in unconsolidated entities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input, redemption period (in months) 56 months  
Level 3 | Collateral Prepayment Rate | Discounted Cash Flow | Weighted Average | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.055  
Level 3 | Collateral Prepayment Rate | Discounted Cash Flow | Minimum | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.028  
Level 3 | Collateral Prepayment Rate | Discounted Cash Flow | Maximum | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.061  
Level 3 | Collateral Default Rate | Discounted Cash Flow | Weighted Average | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.020  
Level 3 | Collateral Default Rate | Discounted Cash Flow | Minimum | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0  
Level 3 | Collateral Default Rate | Discounted Cash Flow | Maximum | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.068  
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 $ 1,397,090,000  
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 $ 135,694,000  
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 0.676  
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 0.026  
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 1.000  
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 0.163  
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 0.053  
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 0.023  
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 0.350  
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 0.350  
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 0.001  
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 0.057  
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) 29 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) 1 month  
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) 57 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 $ 572,723  
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 12,430  
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 3,550,000  
Level 3 | Preferred equity and mezzanine loan investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Preferred equity and mezzanine loan investments $ 183,154,000  
Level 3 | Preferred equity and mezzanine loan investments | Discount Rate | Discounted Cash Flow | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.124  
Level 3 | Preferred equity and mezzanine loan investments | Discount Rate | Discounted Cash Flow | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.115  
Level 3 | Preferred equity and mezzanine loan investments | Discount Rate | Discounted Cash Flow | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.160  
Level 3 | Preferred equity and mezzanine loan investments | 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) 45 months  
Level 3 | Preferred equity and mezzanine loan investments | 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 | Preferred equity and mezzanine loan investments | 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) 186 months  
Consolidated SLST | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt obligations $ 1,077,980,000 1,052,829,000
Investment in Consolidated SLST limited to securities owned, net carrying value 210,900,000 276,800,000
Consolidated SLST | Level 3 | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value 1,290,005,000 $ 1,328,886,000
Investment in Consolidated SLST limited to securities owned, net carrying value $ 210,900,000