FAIR VALUE MEASUREMENT - Inputs used in Valuing the Servicer Advances (Details) - Servicer Advances	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Outstanding Servicer Advances to UPB of Underlying Residential Mortgage Loans	1.70%	2.10%
Prepayment Rate	10.00%	9.80%
Delinquency	13.80%	14.90%
Mortgage Servicing Amount (bps)	0.00182	0.00083
Discount Rate	6.80%	5.60%
Cost to service amount	0.125%	0.224%
Weighted Average
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Collateral Weighted Average Maturity (in years)	25 years 7 months 17 days	24 years 9 months 9 days

Fair Value Inputs, Cost to Service Amount

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- Definition

Mortgage Servicing Amount

+ References

No definition available.

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- Definition

Ratio of servicer advances to unpaid principal balance of underlying residential loans.

+ References

No definition available.

+ Details

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

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- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

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