INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Summary of Activities Related to the Valuation Provision on Reverse Mortgage Loans and Allowance for Loan Losses on Performing Loans (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Reverse Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning, balance		$ 1,518	$ 461
Provision for loan losses	[1]	35	1,111
Charge-offs	[2]	0	0
Reversal of valuation provision on loans transferred to other assets			(54)
Ending, balance		1,553	1,518
Performing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning, balance		1,447	0
Provision for loan losses	[1]	43	1,811
Charge-offs	[2]	(1,371)	(364)
Reversal of valuation provision on loans transferred to other assets			0
Ending, balance		$ 119	$ 1,447

[1] Based on an analysis of collective borrower performance, credit ratings of borrowers, loan-to-value ratios, estimated value of the underlying collateral, key terms of the loans and historical and anticipated trends in defaults and loss severities at a pool level.

[2] Loans, other than PCD loans, are generally charged off or charged down to the net realizable value of the collateral (i.e., fair value less costs to sell), with an offset to the allowance for loan losses, when available information confirms that loans are uncollectible.