FAIR VALUE MEASUREMENT - Additional Information (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 800.0
Asset fair value adjustment	$ 18.3
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
Schedule of Equity Method Investments [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 754.4
Real Estate Acquired in Satisfaction of Debt
Schedule of Equity Method Investments [Line Items]
Assets measured at fair value on a nonrecurring basis	73.8
Loans Held-for-sale
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	19.6
Real Estate Owned
Schedule of Equity Method Investments [Line Items]
Asset fair value adjustment	$ 1.3
Mortgage Servicing Rights
Schedule of Equity Method Investments [Line Items]
Discount rate	9.80%
Mortgage Servicing Rights \| Excess MSRs Investees
Schedule of Equity Method Investments [Line Items]
Weighted average discount rate, used to value investments in excess MSRs	9.70%
Mortgage Servicing Rights Financing Receivable
Schedule of Equity Method Investments [Line Items]
Discount rate	10.40%

Broker Price, Discount (Premium)

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Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties.

+ References

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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- Definition

Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746

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- Definition

The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65670685&loc=d3e14881-158438

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