MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Advances Included in Servicing Advances Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Transfers and Servicing [Abstract]
Principal and interest advances	$ 640,723	$ 616,801
Escrow advances (taxes and insurance advances)	1,733,426	1,442,697
Foreclosure advances	950,092	767,171
Gross advance balance	3,324,241	2,826,669
Reserves, impairment, unamortized discount, net of recovery accruals	(125,320)	(66,419)
Total	3,198,921	2,760,250
Servicer advances receivable related to agency MSRs	673,700	585,000
Servicer advances receivable related to Ginnie Mae MSRS, recoverable from Ginnie Mae	$ 529,300	$ 405,600