FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Fair Value, Measurements, Nonrecurring
Schedule of Equity Method Investments [Line Items]
Assets, fair value	$ 81.8
Residential Mortgage Loans, Held-for-Sale | Fair Value, Measurements, Nonrecurring
Schedule of Equity Method Investments [Line Items]
Assets, fair value	71.3
Real Estate Acquired in Satisfaction of Debt | Fair Value, Measurements, Nonrecurring
Schedule of Equity Method Investments [Line Items]
Assets, fair value	10.5
Residential mortgage loans, held-for-sale, at fair value
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	5.3
Real Estate Owned
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	$ 0.7
Weighted Average
Schedule of Equity Method Investments [Line Items]
Broker price discount	19.00%
Minimum
Schedule of Equity Method Investments [Line Items]
Broker price discount	10.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Broker price discount	25.00%
Excess MSR Joint Ventures | Weighted Average
Schedule of Equity Method Investments [Line Items]
Discount rate	7.80%
Excess MSR Joint Ventures | Minimum
Schedule of Equity Method Investments [Line Items]
Discount rate	7.50%
Excess MSR Joint Ventures | Maximum
Schedule of Equity Method Investments [Line Items]
Discount rate	8.00%
MSRs | Weighted Average
Schedule of Equity Method Investments [Line Items]
Discount rate	7.50%
MSRs | Minimum
Schedule of Equity Method Investments [Line Items]
Discount rate	7.00%
MSRs | Maximum
Schedule of Equity Method Investments [Line Items]
Discount rate	9.00%
MSRs | Excess MSR Joint Ventures
Schedule of Equity Method Investments [Line Items]
Discount rate	7.80%
London Interbank Offered Rate (LIBOR) | MSRs and MSR Financing Receivables
Schedule of Equity Method Investments [Line Items]
Variable interest rate spread	2.10%