INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Real Estate Owned (Details) $ in Thousands	9 Months Ended
Sep. 30, 2017 USD ($)
Real Estate Owned [Roll Forward]
Beginning balance	$ 59,591
Purchases	25,667
Transfer of loans to real estate owned	91,414
Sales	(70,652)
Valuation (provision) reversal on REO	1,261
Ending balance	107,281
Early buy-out and reverse mortgage loans, foreclosure completed
Mortgage Loans on Real Estate [Line Items]
Claims receivable	43,300
Residential Mortgage
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 406,800

Mortgage Loans on Real Estate, Unpaid Balance

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- Definition

Real Estate Owned, Acquisitions

+ References

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- Definition

Real Estate Owned [Roll Forward]

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- Definition

Real Estate Owned, Sales

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- Definition

Real Estate Owned, Total Assets

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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

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Amount of expense recognized in the income statement for a decrease in valuation of real estate owned (REO).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

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