VARIABLE INTEREST ENTITIES LOANS HELD FOR INVESTMENT (Commercial Real Estate Loans Held for Investment) (Details) RSO (RSO [Member], USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2013	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate	10.00%
Allowance for loan loss	7,385,000		4,613,000
Whole Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed contractual interest in floating rate whole loan			15.00%
Whole Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
The amortized cost of loans held for investments, fixed rate whole loans included in floating rate whole loans.			2,000,000
Whole Loans, Fixed Rate, Loan One [Member] [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed contractual interest in floating rate whole loan	12.00%
Preferred equity tranche [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	799,000
Fixed preferred equity interest in floating rate whole loan			10.00%
Mezzanine Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Variable rate basis	LIBOR	LIBOR
Basis spread on variable rate	15.32%		15.32%
Mezzanine Loans, Fixed Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan tranches	2
Mezzanine Loans, Fixed Rate, Tranche One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate	0.50%
Mezzanine Loans, Fixed Rate, Tranche Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread on variable rate	18.50%		18.50%
Stated interest rate	0.50%
Minimum [Member] | Whole Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Variable rate basis	LIBOR	LIBOR
Basis spread on variable rate	2.13%		2.68%
Maturity Dates	October 2014	March 2014
Minimum [Member] | Mezzanine Loans, Fixed Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate	0.50%		0.50%
Maturity Dates	September 2014	September 2014
Maximum [Member] | Whole Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Variable rate basis	LIBOR	LIBOR
Basis spread on variable rate	12.14%		12.14%
Maturity Dates	February 2019	February 2019
Maximum [Member] | Mezzanine Loans, Fixed Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate	18.71%		18.72%
Maturity Dates	September 2021	September 2019
Whole Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan loss	3,923,000		3,758,000
Whole Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, unfunded loan commitments	96,800,000		105,100,000
Not included in total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan loss	4,000,000		4,000,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity	79		78
Amortized Cost	1,445,884,000		1,347,030,000
Allowance for loan loss	720,000		570,000
Commercial Real Estate Loans [Member] | Whole Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	1,362,382,000		1,263,592,000
Fixed contractual interest in floating rate whole loan, Rate Two			15.00%
Commercial Real Estate Loans [Member] | Whole Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity	74		73
Amortized Cost	1,362,382,000		1,263,592,000
Quantity of Loans, Fixed Contractual Interest in Floating Rate Whole Loan, Rate One	2
The amortized cost of loans held for investments, fixed rate whole loans included in floating rate whole loans.	12,000,000
Quantity of Loans, Fixed Contractual Interest in Floating Rate Whole Loan, Rate Two	2
Commercial Real Estate Loans [Member] | Mezzanine Loans, Fixed Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity	3		3
Amortized Cost	54,812,000		54,808,000
Commercial Real Estate Loans [Member] | B Notes, Fixed Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity	1		1
Amortized Cost	16,031,000		16,072,000
Stated interest rate	8.68%		8.68%
Commercial Real Estate Loans [Member] | B Notes, Fixed Rate [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity Dates	April 2016		April 2016
Commercial Real Estate Loans [Member] | Mezzanine Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity	1		1
Amortized Cost	12,659,000		12,558,000
Maturity Dates	April 2016	April 2016
The amortized cost of loans held for investments, fixed rate whole loans included in floating rate whole loans.			4,200,000