INVESTMENTS IN REAL ESTATE SECURITIES - Summary of the Geographic Distributions of the Collateral Securing Non-Agency RMBS (Footnote) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Servicer Advances [Member] \| Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Face amount	$ 431.0

Nominal or face amount on the investment owned.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Underlying
-URI http://asc.fasb.org/extlink&oid=6527499

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 10
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6431724&loc=d3e32938-113948

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 20
-Section 10
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6438156&loc=d3e57880-113973

Name:	us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant