RSO BORROWINGS (Short-Term Repurchase Agreements) (Details) (Short-Term Repurchase Agreements [Member], RCC Real Estate [Member], USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Mar. 08, 2005	Mar. 31, 2013	Dec. 31, 2012
Deutsche Bank Securities, Inc [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (in hundredths)	3.25%
Weighted-average interest rate		1.28%	1.46%
Debt instrument term		12 months
Amount at Risk Under Facility [Abstract]
Amount at Risk		$ 5,360,000	$ 2,069,000
Weighted Average Maturity in Days		15 days	7 days
Weighted Average Borrowing Rate		1.28%	1.46%
Wells Fargo Securities, LLC [Member]
Debt Instrument [Line Items]
Principal outstanding		19,000,000	5,400,000
Collateral, number of securities		7	2
Repurchase agreement, fair value of collateral securities		27,400,000	8,500,000
Description of variable rate basis		one-month LIBOR
Basis spread on variable rate (in hundredths)		1.05%	1.25%
Weighted-average interest rate		1.25%	1.46%
Amount at Risk Under Facility [Abstract]
Amount at Risk		8,837,000	1,956,000
Weighted Average Maturity in Days		1 day	28 days
Weighted Average Borrowing Rate		1.25%	1.46%
Linked repurchase agreement borrowings included as derivative instruments		16,800,000	3,500,000
JP Morgan Securities, LLC [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		1.07%	1.01%
Amount at Risk Under Facility [Abstract]
Amount at Risk		6,965,000	2,544,000
Weighted Average Maturity in Days		12 days	11 days
Weighted Average Borrowing Rate		1.07%	1.01%
Linked repurchase agreement borrowings included as derivative instruments		13,500,000	4,700,000
Linked Transactions [Member] | Deutsche Bank Securities, Inc [Member]
Debt Instrument [Line Items]
Principal outstanding		9,900,000	3,100,000
Repurchase agreement, fair value of collateral securities		15,200,000	5,100,000
Description of variable rate basis		one-month LIBOR	one-month LIBOR
Basis spread on variable rate (in hundredths)		1.08%	1.25%
Weighted-average interest rate		1.28%	1.46%
Amount at Risk Under Facility [Abstract]
Weighted Average Borrowing Rate		1.28%	1.46%
Linked Transactions [Member] | JP Morgan Securities, LLC [Member]
Debt Instrument [Line Items]
Principal outstanding		13,500,000	4,700,000
Repurchase agreement, fair value of collateral securities		$ 20,200,000	$ 7,200,000
Description of variable rate basis		one-month LIBOR	one-month LIBOR
Basis spread on variable rate (in hundredths)		0.86%	0.80%
Weighted-average interest rate		1.07%	1.01%
Amount at Risk Under Facility [Abstract]
Weighted Average Borrowing Rate		1.07%	1.01%