INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Summary of Activities Related to the Carrying Value of Reverse Mortgage Loans and Performing Loans and PCI Loans Held for Investment (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
Movement in Mortgage Loans on Real Estate [Roll Forward]
Transfer of loans to real estate owned		$ (28,836)	$ 0
Reverse Mortgage Loans [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning		24,965
Purchases/additional fundings		837
Proceeds from repayments		(687)
Accretion of loan discount (premium) and other amortization(A)	[1]	4,332
Provision for loan losses		(244)
Transfer of loans to other assets		(8,850)
Transfer of loans to real estate owned		(37)
Balance, ending		20,316
Performing Loans [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning		22,873
Purchases/additional fundings		0
Proceeds from repayments		(2,247)
Accretion of loan discount (premium) and other amortization(A)	[1]	(11)
Provision for loan losses		(118)
Transfer of loans to other assets		0
Transfer of loans to real estate owned		0
Balance, ending		$ 20,497

[1] Includes accelerated accretion of discount on loans paid in full.