RSO BORROWINGS (Short-Term Repurchase Agreements) (Details) (Short-Term Repurchase Agreements [Member], RCC Real Estate [Member], USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Deutsche Bank Securities, Inc [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.40%	1.46%
Debt instrument term	12 months
Amount at Risk Under Facility [Abstract]
Amount at Risk	$ 6,671,000	$ 2,069,000
Weighted Average Maturity in Days	28 days	7 days
Weighted Average Borrowing Rate	1.40%	1.46%
Wells Fargo Securities, LLC [Member]
Debt Instrument [Line Items]
Principal outstanding	1,800,000	1,900,000
Collateral, number of securities	1	1
Repurchase agreement, fair value of collateral securities	2,800,000	3,100,000
Description of variable rate basis	one-month LIBOR	one-month LIBOR
Basis spread on variable rate (in hundredths)	0.90%	0.01%
Weighted-average interest rate	1.08%	1.46%
Amount at Risk Under Facility [Abstract]
Amount at Risk	9,048,000	1,956,000
Weighted Average Maturity in Days	28 days	28 days
Weighted Average Borrowing Rate	1.08%	1.46%
Linked repurchase agreement borrowings included as derivative instruments	23,100,000	3,500,000
JP Morgan Securities, LLC [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.03%	1.01%
Amount at Risk Under Facility [Abstract]
Amount at Risk	7,716,000	2,544,000
Weighted Average Maturity in Days	29 days	11 days
Weighted Average Borrowing Rate	1.03%	1.01%
Linked repurchase agreement borrowings included as derivative instruments	18,800,000	4,700,000
Linked Transactions [Member]
Debt Instrument [Line Items]
Description of variable rate basis	one-month LIBOR
Linked Transactions [Member] | Deutsche Bank Securities, Inc [Member]
Debt Instrument [Line Items]
Principal outstanding	12,300,000	3,100,000
Collateral, number of securities	1
Repurchase agreement, fair value of collateral securities	18,900,000	5,100,000
Description of variable rate basis	one-month LIBOR	one-month LIBOR
Basis spread on variable rate (in hundredths)	1.21%	1.25%
Weighted-average interest rate	1.40%	1.46%
Amount at Risk Under Facility [Abstract]
Weighted Average Borrowing Rate	1.40%	1.46%
Linked Transactions [Member] | Wells Fargo Securities, LLC [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (in hundredths)	1.02%
Weighted-average interest rate	1.21%
CMBS Linked repurchase agreement	23,100,000
Amount at Risk Under Facility [Abstract]
Weighted Average Borrowing Rate	1.21%
Linked Transactions [Member] | JP Morgan Securities, LLC [Member]
Debt Instrument [Line Items]
Principal outstanding	18,800,000	4,700,000
Collateral, number of securities	1
Repurchase agreement, fair value of collateral securities	$ 26,400,000	$ 7,200,000
Description of variable rate basis	one-month LIBOR	one-month LIBOR
Basis spread on variable rate (in hundredths)	0.83%	0.80%
Weighted-average interest rate	1.03%	1.01%
Amount at Risk Under Facility [Abstract]
Weighted Average Borrowing Rate	1.03%	1.01%