FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Broker price discount	10.00%
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Broker price discount	25.00%
Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Broker price discount	22.00%
Residential Mortgage Loans, Held-for-Sale, at Lower Cost or Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset fair value adjustment	$ 3.3
Real Estate Owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset fair value adjustment	1.4
Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	80.7
Fair Value, Measurements, Nonrecurring | Total residential mortgage loans, HFS, at fair value and lower of cost or fair value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	72.9
Fair Value, Measurements, Nonrecurring | Real Estate Acquired in Satisfaction of Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 7.8