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Fair Value of Financial Instruments - Significant Unobservable Outputs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations $ 839,419,000 $ 1,054,335,000
VIE, Primary Beneficiary | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations 839,419,000 1,054,335,000
VIE, Primary Beneficiary | Consolidated SLST    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Variable interest entity, primary beneficiary, maximum loss exposure, amount 230,300,000 212,100,000
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value 3,575,601,000  
Fair Value 239,631,000 259,095,000
Level 3 | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 191,238,000  
Level 3 | VIE, Primary Beneficiary | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations 839,419,000 $ 1,054,335,000
Level 3 | VIE, Primary Beneficiary | Consolidated SLST    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value 1,070,882,000  
Level 3 | VIE, Primary Beneficiary | Consolidated SLST | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations $ 839,419,000  
Level 3 | Weighted Average | Valuation Technique, Discounted Cash Flow | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investment, measurement input   0.00%
Level 3 | Weighted Average | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.164  
Level 3 | Weighted Average | Measurement Input Yield | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.029  
Level 3 | Weighted Average | Discount Rate | Valuation Technique, Discounted Cash Flow | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, measurement input 12.40%  
Level 3 | Weighted Average | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential mortgage loans, measurement input, redemption period 29 months  
Level 3 | Weighted Average | Measurement Input Collateral Prepayment Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.104  
Level 3 | Weighted Average | Measurement Input Collateral Default Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.019  
Level 3 | Minimum | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0  
Level 3 | Minimum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.016  
Level 3 | Minimum | Discount Rate | Valuation Technique, Discounted Cash Flow | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, measurement input 11.00%  
Level 3 | Minimum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential mortgage loans, measurement input, redemption period 2 years  
Level 3 | Minimum | Measurement Input Collateral Prepayment Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.037  
Level 3 | Minimum | Measurement Input Collateral Default Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0  
Level 3 | Maximum | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.230  
Level 3 | Maximum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.170  
Level 3 | Maximum | Discount Rate | Valuation Technique, Discounted Cash Flow | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, measurement input 15.40%  
Level 3 | Maximum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential mortgage loans, measurement input, redemption period 57 years  
Level 3 | Maximum | Measurement Input Collateral Prepayment Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.130  
Level 3 | Maximum | Measurement Input Collateral Default Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.081  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value $ 2,411,356,000  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value $ 93,363,000  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Lifetime CPR | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 8.50%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Lifetime CDR | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 0.50%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 9.20%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Yield | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 4.60%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Yield | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 7.20%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Annual Home Price Appreciation | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 1.80%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Liquidation Timeline Period | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input, liquidation timeline, months 28 years  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input, Appraised Value | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value $ 677,928  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Lifetime CPR | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 0.00%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Lifetime CDR | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 0.00%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 0.00%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 2.30%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Yield | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 7.00%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Annual Home Price Appreciation | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 0.00%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Liquidation Timeline Period | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input, liquidation timeline, months 9 months  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input, Appraised Value | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value $ 15,000  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Lifetime CPR | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 48.70%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Lifetime CDR | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 29.00%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 100.00%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 40.80%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Yield | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 26.10%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Annual Home Price Appreciation | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input 38.20%  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Liquidation Timeline Period | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, measurement input, liquidation timeline, months 50 months  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input, Appraised Value | Valuation Technique Liquidation Model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value $ 6,500,000  
Preferred equity and mezzanine loan investments | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Multi-family loans, at fair value $ 120,021,000  
Preferred equity and mezzanine loan investments | Level 3 | Weighted Average | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investment, measurement input   0.00%
Preferred equity and mezzanine loan investments | Level 3 | Weighted Average | Discount Rate | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, measurement input 11.30%  
Preferred equity and mezzanine loan investments | Level 3 | Weighted Average | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, measurement input, assumed redemption period 37 months  
Preferred equity and mezzanine loan investments | Level 3 | Minimum | Discount Rate | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, measurement input 10.00%  
Preferred equity and mezzanine loan investments | Level 3 | Minimum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, measurement input, assumed redemption period 1 month  
Preferred equity and mezzanine loan investments | Level 3 | Maximum | Discount Rate | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, measurement input 19.50%  
Preferred equity and mezzanine loan investments | Level 3 | Maximum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, measurement input, assumed redemption period 60 months