MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Narrative (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Jan. 31, 2018	Jul. 31, 2017
Schedule of MSRs [Line Items]
Residential mortgage loan repurchase liability	[1]	$ 1,443,546		$ 1,219,890
Residential mortgage loans, held-for-sale		2,819,282		3,398,298
Reserve for non-recovery advances		$ 108,791		$ 65,428
Reserve for non-recovery advances, percent		4.30%		2.30%
Ocwen | Rithm Capital
Schedule of MSRs [Line Items]
Unpaid principal balance of underlying loans, transferred		$ 66,700,000
Unpaid principal balance of underlying loans, not yet transferred		$ 11,600,000
PHH Mortgage Corporation
Schedule of MSRs [Line Items]
Subservicer percent of UPB		8.70%
Valon
Schedule of MSRs [Line Items]
Subservicer percent of UPB		3.90%
LoanCare
Schedule of MSRs [Line Items]
Subservicer percent of UPB		1.60%
Newrez and Caliber
Schedule of MSRs [Line Items]
Subservicer percent of UPB		85.80%
Ginnie Mae Loans
Schedule of MSRs [Line Items]
Residential mortgage loans, held-for-sale		$ 400,000
Ocwen
Schedule of MSRs [Line Items]
Residential mortgage loan UPB and other collateral					$ 86,800,000	$ 110,000,000
Mortgage Loans Serviced
Schedule of MSRs [Line Items]
Residential mortgage loan UPB and other collateral		99,400,000	$ 91,800,000
Subservicing revenue		$ 104,000	$ 100,400

[1] See Note 5 for details.