FAIR VALUE MEASUREMENT - Inputs Used in Valuing Residential Mortgage Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Weighted Average Life (Years)	1 year 2 months 2 days
Performing Loans
Mortgage Loans on Real Estate [Line Items]
Weighted Average Life (Years)	5 years 6 months 1 day
Nonrecurring
Mortgage Loans on Real Estate [Line Items]
Discount Rate	3.80%	4.90%
Weighted Average Life (Years)	4 years 9 months 16 days	4 years 1 month 5 days
Prepayment Rate	11.50%	6.10%
Loss Severity	36.90%	27.90%
Nonrecurring \| Performing Loans
Mortgage Loans on Real Estate [Line Items]
Discount Rate	3.80%	3.80%
Weighted Average Life (Years)	4 years 9 months 18 days	5 years 11 months 19 days
Prepayment Rate	11.50%	11.70%
CDR	1.10%	1.20%
Loss Severity	36.90%	24.40%
Nonrecurring \| Non-Performing Loans
Mortgage Loans on Real Estate [Line Items]
Discount Rate	7.50%	5.60%
Weighted Average Life (Years)	3 years 9 months 18 days	2 years 11 months 25 days
Prepayment Rate	3.00%	2.80%
CDR	3.00%
Loss Severity	30.00%	30.00%
Nonrecurring \| Fair Value
Mortgage Loans on Real Estate [Line Items]
Fair Value	$ 725,324	$ 406,284
Nonrecurring \| Fair Value \| Performing Loans
Mortgage Loans on Real Estate [Line Items]
Fair Value	721,121	151,436
Nonrecurring \| Fair Value \| Non-Performing Loans
Mortgage Loans on Real Estate [Line Items]
Fair Value	$ 4,203	$ 254,848

Weighted average expected timing of the receipt of expected cash flows for this investment.

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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

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

+ Details

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- Definition

Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value.

+ References

+ Details

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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

+ Details

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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

+ Details

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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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.

+ Details

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