FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Residential Mortgage Loans, Held-For-Sale, At Lower Cost Or Fair Value
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	$ 3.9
Real Estate Owned
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	1.1
Fair Value, Measurements, Nonrecurring
Schedule of Equity Method Investments [Line Items]
Assets, fair value	85.5
Fair Value, Measurements, Nonrecurring | Residential Mortgage Loans, Held-for-Sale
Schedule of Equity Method Investments [Line Items]
Assets, fair value	78.7
Fair Value, Measurements, Nonrecurring | Real Estate Acquired in Satisfaction of Debt
Schedule of Equity Method Investments [Line Items]
Assets, fair value	$ 6.8
Weighted Average
Schedule of Equity Method Investments [Line Items]
Broker price discount	21.00%
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	8.80%
Excess MSR joint ventures | Minimum
Schedule of Equity Method Investments [Line Items]
Discount rate	8.50%
Excess MSR joint ventures | Maximum
Schedule of Equity Method Investments [Line Items]
Discount rate	9.00%
MSRs | Weighted Average
Schedule of Equity Method Investments [Line Items]
Discount rate	8.50%
MSRs | Minimum
Schedule of Equity Method Investments [Line Items]
Discount rate	7.90%
MSRs | Maximum
Schedule of Equity Method Investments [Line Items]
Discount rate	10.80%
MSRs | Excess MSR joint ventures
Schedule of Equity Method Investments [Line Items]
Discount rate	8.80%
Secured Overnight Financing Rate | MSRs and MSR Financing Receivables
Schedule of Equity Method Investments [Line Items]
Variable interest rate spread	4.10%