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Fair Value of Financial Instruments - Significant Unobservable Outputs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations $ 1,870,517,000 $ 2,102,717,000
Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations 593,737,000 634,495,000
VIE, Primary Beneficiary | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations 593,737,000 634,495,000
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   191,500,000
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value 3,084,303,000  
Fair Value 147,116,000 179,746,000
Level 3 | VIE, Primary Beneficiary | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations 593,737,000 $ 634,495,000
Level 3 | VIE, Primary Beneficiary | Consolidated SLST    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value 754,860,000  
Variable interest entity, primary beneficiary, maximum loss exposure, amount 157,200,000  
Level 3 | Valuation Technique, Discounted Cash Flow | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 109,962,000  
Level 3 | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations $ 593,737,000  
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 | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.214  
Level 3 | Weighted Average | Measurement Input Yield | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.058  
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 14.00%  
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]    
Financial instruments, measurement input, assumed redemption period 24 months  
Level 3 | Weighted Average | Measurement Input Collateral Prepayment Rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.061  
Level 3 | Weighted Average | Measurement Input Collateral Default Rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.013  
Level 3 | Minimum | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.172  
Level 3 | Minimum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.050  
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 13.00%  
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]    
Financial instruments, measurement input, assumed redemption period 7 months  
Level 3 | Minimum | Measurement Input Collateral Prepayment Rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.026  
Level 3 | Minimum | Measurement Input Collateral Default Rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
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 | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.633  
Level 3 | Maximum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.100  
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 15.50%  
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]    
Financial instruments, measurement input, assumed redemption period 54 months  
Level 3 | Maximum | Measurement Input Collateral Prepayment Rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.070  
Level 3 | Maximum | Measurement Input Collateral Default Rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, measurement input 0.084  
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value $ 2,138,811,000  
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 $ 190,632,000  
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 4.90%  
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 0.70%  
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 12.70%  
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 7.50%  
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 7.60%  
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 0.30%  
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 18 months  
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 $ 2,536,520  
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 4.70%  
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 7.20%  
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 $ 9,000  
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 48.50%  
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 22.60%  
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 31.00%  
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 29.20%  
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 12.00%  
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 $ 13,750,000  
Multi-family loans | Level 3 | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Multi-family loans, at fair value $ 95,792,000  
Multi-family loans | 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%  
Multi-family loans | 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 12.60%  
Multi-family loans | 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 32 months  
Multi-family loans | 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 11.00%  
Multi-family loans | 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 3 months  
Multi-family loans | 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 20.50%  
Multi-family loans | 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 55 months