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RESIDENTIAL MORTGAGE LOANS - Schedule of Difference Between Aggregate UPB and Aggregate Carrying Value of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Carrying Value $ 384,126  
Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
UPB 3,544,990 $ 3,003,320
Carrying Value 3,563,905 2,919,786
Carrying Value Over (Under) UPB 18,915 (83,534)
Current | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
UPB 3,241,643 2,690,198
Carrying Value 3,285,610 2,638,230
Carrying Value Over (Under) UPB 43,967 (51,968)
90+    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
UPB 29,114 0
Carrying Value 29,114 0
Carrying Value Over (Under) UPB 0 0
90+ | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
UPB 303,347 313,122
Carrying Value 278,295 281,556
Carrying Value Over (Under) UPB $ (25,052) $ (31,566)