FAIR VALUE MEASUREMENT - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 300,000
Asset fair value adjustment	(1,600)
Fair Value [Member] | Fair Value, Measurements, Nonrecurring [Member]
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 249,014
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Broker price discount	10.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Broker price discount	25.00%
Residential Mortgage Loans [Member]
Schedule of Equity Method Investments [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 249,000
Real Estate Acquired in Satisfaction of Debt [Member]
Schedule of Equity Method Investments [Line Items]
Assets measured at fair value on a nonrecurring basis	59,300
Real Estate Owned [Member]
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	900
Loans Held-for-sale [Member]
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	$ 2,500
MSRs [Member]
Schedule of Equity Method Investments [Line Items]
Discount rate	11.50%
Excess MSRs Investees [Member] | MSRs [Member]
Schedule of Equity Method Investments [Line Items]
Weighted average discount rate, used to value investments in excess MSRs	9.80%