VARIABLE INTEREST ENTITIES LOANS HELD FOR INVESTMENT (Commercial Real Estate Loans Held for Investment) (Details) RSO - RSO [Member]	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) Loan	Jun. 30, 2015 USD ($) Loan	Jun. 30, 2014	Dec. 31, 2014 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal paydown receivable	$ 11,525,000	$ 11,525,000		$ 40,920,000
Stated interest rate	10.00%	10.00%
Allowance for loan loss	$ 46,319,000	$ 46,319,000		4,613,000
Provision (recovery) for loan losses		42,800,000		1,804,000
Interest receivable	12,046,000	12,046,000		16,260,000
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (recovery) for loan losses	38,100,000	38,072,000		$ (3,758,000)
Interest receivable	$ 0	$ 0
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%	12.00%		12.00%
Mezzanine Loans, Fixed Rate, Tranche Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Variable rate basis			LIBOR
Basis spread on variable rate				18.50%
Stated interest rate	0.50%	0.50%
Preferred equity tranche [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 799,000	$ 799,000
Fixed preferred equity interest in floating rate whole loan				10.00%
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
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%		15.32%
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%	2.13%		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%		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%		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%	18.71%		18.72%
Maturity Dates		September 2021		September 2019
Whole Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan loss	$ 3,950,000	$ 3,950,000		$ 3,758,000
Not included in total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan loss	$ 42,100,000	$ 42,100,000		4,000,000
Mezzanine Loans, Fixed Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity | Loan	1	1
Whole Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, unfunded loan commitments	$ 104,500,000	$ 104,500,000		$ 105,100,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity | Loan	87	87		78
Amortized Cost	$ 1,573,422,000	$ 1,573,422,000		$ 1,347,030,000
Allowance for loan loss	997,000	997,000		570,000
Commercial Real Estate Loans [Member] | Whole Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 1,502,603,000	$ 1,502,603,000		$ 1,263,592,000
Fixed contractual interest in floating rate whole loan, Rate Two				15.00%
Commercial Real Estate Loans [Member] | Mezzanine Loans, Fixed Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity | Loan	3	3		3
Amortized Cost	$ 54,822,000	$ 54,822,000		$ 54,808,000
Commercial Real Estate Loans [Member] | B Notes, Fixed Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity | Loan	1	1		1
Amortized Cost	$ 15,997,000	$ 15,997,000		$ 16,072,000
Stated interest rate	8.68%	8.68%		8.68%
Maturity Dates		April 2016		April 2016
Commercial Real Estate Loans [Member] | Whole Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity | Loan	83	83		73
Amortized Cost	$ 1,502,603,000	$ 1,502,603,000		$ 1,263,592,000
Quantity of Loans, Fixed Contractual Interest in Floating Rate Whole Loan, Rate One | Loan				2
The amortized cost of loans held for investments, fixed rate whole loans included in floating rate whole loans.	$ 12,300,000	$ 12,300,000		$ 12,000,000
Commercial Real Estate Loans [Member] | Mezzanine Loans, Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Quantity | Loan				1
Amortized Cost				$ 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