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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2024
USD ($)
securitization
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Variable Interest Entity [Line Items]      
Number of securitizations completed | securitization 2    
Proceeds from securitizations of loans held-for-investment $ 497,000    
Loss (gain) on extinguishment of collateralized debt obligations and mortgages payable on real estate 692 $ (1,170)  
Residential loans held in securitization trusts      
Variable Interest Entity [Line Items]      
Proceeds from residential loan securitization redemption 147,600    
Loss (gain) on extinguishment of collateralized debt obligations and mortgages payable on real estate 700    
VIE, Primary Beneficiary | Consolidated SLST      
Variable Interest Entity [Line Items]      
Variable interest entity, primary beneficiary, maximum loss exposure, amount $ 151,200   $ 157,200