INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Schedule of Past Due Information for Performing Loans (Footnote) (Details)	9 Months Ended
	Sep. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Threshold period past due	60 days
Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Threshold period past due	120 days
Equal to Greater than 90 Days Past Due [Member] | Lower Range [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Threshold period past due	90 days
Equal to Greater than 90 Days Past Due [Member] | Upper Range [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Threshold period past due	119 days