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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)
 3 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Consolidated SLST CDOs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt, carrying value $ 754,264,000 $ 839,419,000
Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt, carrying value 754,264,000 839,419,000
Consolidated SLST | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investment in Consolidated SLST limited to securities owned, net carrying value 214,100,000 230,300,000
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value 3,953,427,000  
Equity investments 225,300,000 239,631,000
Level 3 | Consolidated SLST CDOs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt, carrying value 754,264,000 $ 839,419,000
Level 3 | Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity investments $ 193,194,000  
Level 3 | Loss severity | Discounted cash flow | Weighted Average | Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments in unconsolidated entities, measurement input 0  
Level 3 | Discount rate | Discounted cash flow | Weighted Average | Equity investments    
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 | Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments in unconsolidated entities, measurement input 0.110  
Level 3 | Discount rate | Discounted cash flow | Maximum | Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments in unconsolidated entities, measurement input 0.154  
Level 3 | Months to assumed redemption | Discounted cash flow | Weighted Average | Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input, redemption period (in months) 28 months  
Level 3 | Months to assumed redemption | Discounted cash flow | Minimum | Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input, redemption period (in months) 1 year  
Level 3 | Months to assumed redemption | Discounted cash flow | Maximum | Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input, redemption period (in months) 54 months  
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 $ 2,890,919,000  
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 $ 92,655,000  
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 0.059  
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 0.444  
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 0.004  
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 0.230  
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 0.075  
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 0.966  
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 0.052  
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 0.037  
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 0.363  
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 0.077  
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 0.075  
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 0.285  
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 0.013  
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 0.231  
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | 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 | Liquidation timeline (months) | Liquidation model | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input, liquidation timeline (in months) 9 months  
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | Liquidation model | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, measurement input, liquidation timeline (in months) 50 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 $ 607,487  
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 17,000  
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 3,880,000  
Level 3 | Multi-family loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Multi-family loans $ 110,208,000  
Level 3 | Multi-family loans | Loss severity | Discounted cash flow | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0  
Level 3 | Multi-family loans | Discount rate | Discounted cash flow | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.113  
Level 3 | Multi-family loans | Discount rate | Discounted cash flow | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.100  
Level 3 | Multi-family loans | Discount rate | Discounted cash flow | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.195  
Level 3 | Multi-family loans | 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) 36 months  
Level 3 | Multi-family loans | 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) 0 years  
Level 3 | Multi-family loans | 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) 57 months  
Level 3 | Consolidated SLST | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Residential mortgage loans, at fair value $ 969,853,000  
Investment in Consolidated SLST limited to securities owned, net carrying value 214,100,000  
Level 3 | Consolidated SLST | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Collateralized debt, carrying value $ 754,264,000  
Level 3 | Consolidated SLST | Loss severity | Discounted cash flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.171  
Level 3 | Consolidated SLST | Loss severity | Discounted cash flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0  
Level 3 | Consolidated SLST | Loss severity | Discounted cash flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.196  
Level 3 | Consolidated SLST | Yield | Discounted cash flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.045  
Level 3 | Consolidated SLST | Yield | Discounted cash flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.035  
Level 3 | Consolidated SLST | Yield | Discounted cash flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.199  
Level 3 | Consolidated SLST | Collateral prepayment rate | Discounted cash flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.081  
Level 3 | Consolidated SLST | Collateral prepayment rate | Discounted cash flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.030  
Level 3 | Consolidated SLST | Collateral prepayment rate | Discounted cash flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.097  
Level 3 | Consolidated SLST | Collateral default rate | Discounted cash flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.018  
Level 3 | Consolidated SLST | Collateral default rate | Discounted cash flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0  
Level 3 | Consolidated SLST | Collateral default rate | Discounted cash flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt, measurement input 0.074