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MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Components of Servicing Revenue, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Servicing Asset at Amortized Cost [Line Items]        
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration]     Origination and Servicing, Investment Portfolio, Mortgage Loans Receivable and Corporate  
Ancillary Fee Income, Servicing Financial Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]     Origination and Servicing, Investment Portfolio, Mortgage Loans Receivable and Corporate  
Change in valuation inputs and assumptions, net of realized gains (losses)     $ (323,443)  
Excess spread financing $ 1,300   3,500  
Change in valuation and assumptions, excess spread financing 7,300   14,100  
MSRs        
Servicing Asset at Amortized Cost [Line Items]        
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 454,757 $ 412,167 1,338,860 $ 1,283,967
Ancillary and other fees 38,414 30,258 123,180 93,462
Servicing fee revenue, net and fees 493,171 442,425 1,462,040 1,377,429
Realization of cash flows (139,784) (138,993) (421,761) (384,094)
Change in valuation inputs and assumptions, net of realized gains (losses) (607,551) 159,927 (309,297) 284,756
Servicing revenue, net $ (254,164) $ 463,359 $ 730,982 $ 1,278,091