EXCESS MORTGAGE SERVICING RIGHTS - Schedule of Activity Related to the Carrying Value of Investments in Excess MSRs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Carrying Value of Investments in Excess MSRs
Beginning balance	$ 8,405,938	$ 8,889,403
Servicing Asset, At Fair Value, Acquisition [Abstract]
Ending balance	$ 10,321,671	$ 8,405,938
Servicing Asset, Fair Value, Change in Fair Value, Other, Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized and unrealized gains (losses), net	Realized and unrealized gains (losses), net
Excess MSRs
Carrying Value of Investments in Excess MSRs
Beginning balance	$ 271,150	$ 321,803
Purchases	122,887
Interest income	29,815	18,310
Other income	(656)	267
Proceeds from repayments	(55,750)	(41,552)
Proceeds from sales	499	2,779
Change in fair value	10,820	(15,227)
Servicing Asset, At Fair Value, Acquisition [Abstract]
Distributions of earnings from equity method investees	(344)	(2,219)
Distributions of capital from equity method investees	(8,846)	(9,968)
Change in fair value of investments in equity method investees	1,617	2,515
Reclassification of SLS serviced Excess MSRs to full MSRs	(1,032)
Ending balance	369,162	271,150
Indirect investment	$ 62,800	$ 72,400