MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Summary of Reserve For Servicer Advances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Servicer Advances Reserve [Roll Forward]
Beginning balance	$ 65,428	$ 32,122
Provision	63,016	48,392
Write-offs	(34,763)	(15,086)
Ending balance	$ 93,681	$ 65,428