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Real Estate Owned - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 19, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Real Estate [Line Items]          
Principal balance $ 23,189,312,000   $ 23,787,012,000    
CECL reserve 751,370,000   576,936,000 $ 336,591,000 $ 326,137,000
Real estate owned, net 60,203,000   0    
Amount charged off 61,013,000        
REO liabilities 0   $ 0    
Impairment charges recognized for REO assets 0        
Income on real estate owned 0        
Net expense from real estate owned 0        
Commercial Real Estate          
Real Estate [Line Items]          
Principal balance   $ 90,200,000      
CECL reserve   29,100,000      
Amount charged off 29,100,000        
Level 3 | Fair Value, Nonrecurring          
Real Estate [Line Items]          
Principal balance 2,400,000,000        
CECL reserve $ 602,600,000        
Real estate owned, net   $ 60,200,000