MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022		Mar. 31, 2021	Dec. 31, 2021		Jan. 31, 2018	Jul. 31, 2017
Schedule of MSRs [Line Items]
Residential mortgage loans subject to repurchase	$ 1,700,426	[1]	$ 1,493,449	$ 1,787,314	[1]
Residential mortgage loans, held-for-sale	7,202,475			11,347,845
Reserve for non-recovery advances	37,359			$ 32,122
Ocwen | New Residential Mortgage LLC
Schedule of MSRs [Line Items]
Unpaid principal balance of underlying loans, transferred	66,700,000
Unpaid principal balance of underlying loans, not yet transferred	$ 13,400,000
PHH Mortgage Corporation
Schedule of MSRs [Line Items]
Subservicer percent of UPB	9.90%
Mr. Cooper
Schedule of MSRs [Line Items]
Subservicer percent of UPB	8.90%
LoanCare
Schedule of MSRs [Line Items]
Subservicer percent of UPB	7.50%
Valon
Schedule of MSRs [Line Items]
Subservicer percent of UPB	0.90%
Flagstar Bank
Schedule of MSRs [Line Items]
Subservicer percent of UPB	0.30%
Newrez And Caliber
Schedule of MSRs [Line Items]
Subservicer percent of UPB	72.50%
Ginnie Mae Loans
Schedule of MSRs [Line Items]
Residential mortgage loans, held-for-sale	$ 1,100,000
Ocwen
Schedule of MSRs [Line Items]
Residential mortgage loan UPB and other collateral						$ 86,800,000	$ 110,000,000
Mortgage Loans Subserviced
Schedule of MSRs [Line Items]
Residential mortgage loan UPB and other collateral	86,200,000		74,600,000
Subservicing revenue	$ 32,500		$ 43,500

[1] See Note 5 for details.