DEBT OBLIGATIONS - Borrowing Capacity (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Residential Mortgage Loans and REO
Debt Instrument [Line Items]
Borrowing Capacity	$ 5,398,330
Balance Outstanding	2,034,184
Available Financing	3,364,146
Loan originations
Debt Instrument [Line Items]
Borrowing Capacity	7,421,000
Balance Outstanding	1,520,582
Available Financing	5,900,418
Excess MSRs
Debt Instrument [Line Items]
Borrowing Capacity	286,380
Balance Outstanding	202,662
Available Financing	83,718
MSRs
Debt Instrument [Line Items]
Borrowing Capacity	7,155,473
Balance Outstanding	4,305,473
Available Financing	2,850,000
Servicer advances
Debt Instrument [Line Items]
Borrowing Capacity	3,595,000
Balance Outstanding	2,429,254
Available Financing	1,165,746
Residential mortgage loans
Debt Instrument [Line Items]
Borrowing Capacity	290,715
Balance Outstanding	189,364
Available Financing	101,351
Debt Excess Borrowing Capacity
Debt Instrument [Line Items]
Borrowing Capacity	24,146,898
Balance Outstanding	10,681,519
Available Financing	$ 13,465,379