INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Schedule of Past Due Information for Performing Loans (Details) (Delinquency Status [Member])	Mar. 31, 2015
Delinquency Status [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	86.10%	[1]
30-59	13.90%	[1]
60-89	0.00%	[1]
90-119	0.00%	[1],[2]
120 and greater	0.00%	[1],[3]
Total Loans	100.00%	[1]

[1] Represents the percentage of the total principal balance that corresponds to loans that are in each delinquency status.

[2] Includes loans 90-119 days past due and still accruing because they are generally placed on nonaccrual status at 120 days or more past due.

[3] Represents nonaccrual loans.