Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENT - Narrative (Details)

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FAIR VALUE MEASUREMENT - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]  
Asset fair value adjustment $ 4.2
Fair Value, Measurements, Nonrecurring  
Schedule of Equity Method Investments [Line Items]  
Assets, fair value $ 300.0
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%
Residential Mortgage Loans | Fair Value, Measurements, Nonrecurring  
Schedule of Equity Method Investments [Line Items]  
Assets, fair value $ 238.1
Real Estate Acquired in Satisfaction of Debt | Fair Value, Measurements, Nonrecurring  
Schedule of Equity Method Investments [Line Items]  
Assets, fair value 78.9
Loans Held-for-sale and Held-for-investment  
Schedule of Equity Method Investments [Line Items]  
Asset fair value adjustment 4.4
Real Estate Owned  
Schedule of Equity Method Investments [Line Items]  
Asset fair value adjustment $ 0.2
Mortgage Servicing Rights Financing Receivable  
Schedule of Equity Method Investments [Line Items]  
Discount rate 10.20%
MSRs  
Schedule of Equity Method Investments [Line Items]  
Discount rate 8.60%
MSRs | Excess MSRs Investees  
Schedule of Equity Method Investments [Line Items]  
Weighted average discount rate, used to value investments in excess MSRs 8.80%
London Interbank Offered Rate (LIBOR) | Mortgage Servicing Rights Financing Receivable  
Schedule of Equity Method Investments [Line Items]  
Variable interest rate spread 0.90%