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Fair Value of Financial Instruments - Significant Unobservable Outputs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
VIE, Primary Beneficiary | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations $ 634,495,000 $ 839,419,000
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 191,500,000 230,300,000
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value 3,525,080,000  
Fair Value 179,746,000 239,631,000
Level 3 | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 152,246,000  
Level 3 | VIE, Primary Beneficiary | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations 634,495,000 $ 839,419,000
Level 3 | VIE, Primary Beneficiary | Consolidated SLST    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans, fair value 827,582,000  
Level 3 | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST CDOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateralized debt obligations 634,495,000  
Level 3 | Valuation Technique, Discounted Cash Flow | Equity investments in disposal group held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 9,010,000  
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 | Equity investments in disposal group held for sale    
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 0.171  
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 0.053  
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 13.50%  
Level 3 | Weighted Average | Discount Rate | Valuation Technique, Discounted Cash Flow | Equity investments in disposal group held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investment, measurement input 16.00%  
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]    
Residential mortgage loans, measurement input, redemption period 21 months  
Level 3 | Weighted Average | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow | Equity investments in disposal group held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential mortgage loans, measurement input, redemption period 23 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 0.057  
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 0.016  
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  
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 0.047  
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 | Discount Rate | Valuation Technique, Discounted Cash Flow | Equity investments in disposal group held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investment, measurement input 16.00%  
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 months  
Level 3 | Minimum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow | Equity investments in disposal group held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential mortgage loans, measurement input, redemption period 23 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 0.025  
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 0.198  
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 0.078  
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 | Discount Rate | Valuation Technique, Discounted Cash Flow | Equity investments in disposal group held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investment, measurement input 16.00%  
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 34 months  
Level 3 | Maximum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow | Equity investments in disposal group held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential mortgage loans, measurement input, redemption period 23 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 0.066  
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 0.115  
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 $ 2,578,229,000  
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 $ 119,269,000  
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 4.40%  
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 7.40%  
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 8.20%  
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 7.70%  
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 0.10%  
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 23 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 $ 1,591,892  
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 6.10%  
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 7.50%  
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 (4.80%)  
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 $ 15,300  
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 45.30%  
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 23.80%  
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 96.50%  
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 88.40%  
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 28.50%  
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 11.80%  
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 $ 13,800,000  
Multi-family loans | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Multi-family loans, at fair value $ 87,534,000  
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 12.40%  
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 36 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 9 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 54 months