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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, 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 $ 1,088,233,000 1,052,829,000
Investment in unconsolidated entities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments in unconsolidated entities 85,189,000 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 180,850,000  
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value 2,758,228,000  
Investments in unconsolidated entities 214,289,000 191,359,000
Level 3 | Residential collateralized debt obligations, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt obligations 1,088,233,000 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 129,100,000  
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 $ 1,088,233,000  
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 0.217  
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 0.240  
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 0.027  
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 0.014  
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 0.126  
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 0.124  
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) 44 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) 20 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) 57 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 0.056  
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 0.034  
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 0.036  
Level 3 | Residential loans and residential loans held in securitization trusts (1)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value $ 1,334,944,000  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | Liquidation Model    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value $ 148,434,000  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | Lifetime CPR | Discounted Cash Flow | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input 0.102  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | 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 (1) | Lifetime CPR | Discounted Cash Flow | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input 0.742  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | Lifetime CDR | Discounted Cash Flow | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input 0.030  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | 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 (1) | Lifetime CDR | Discounted Cash Flow | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input 0.450  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | Loss Severity | Discounted Cash Flow | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input 0.171  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | 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 (1) | 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 (1) | Yield | Discounted Cash Flow | Weighted Average    
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 (1) | 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 (1) | Yield | Discounted Cash Flow | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input 0.339  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | Yield | Liquidation Model | Weighted Average    
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 (1) | Yield | 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 (1) | Yield | Liquidation Model | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input 0.150  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | 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  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | Annual Home Price Appreciation | Liquidation Model | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input (0.013)  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | Annual Home Price Appreciation | Liquidation Model | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input 0.014  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | 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) 27 months  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | 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 (1) | 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 (1) | Property Value | Liquidation Model | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value $ 470,204  
Level 3 | Residential loans and residential loans held in securitization trusts (1) | 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 (1) | Property Value | Liquidation Model | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value 2,734,000  
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 $ 180,850,000  
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 0.123  
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) 46 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) 7 months  
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) 188 months  
Consolidated SLST | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt obligations $ 1,088,233,000 1,052,829,000
Investment in Consolidated SLST limited to securities owned, net carrying value 185,300,000 276,800,000
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 1,274,850,000 $ 1,328,886,000
Investment in Consolidated SLST limited to securities owned, net carrying value $ 185,300,000