DEBT OBLIGATIONS (Details)						3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 26, 2015 USD ($)	Apr. 10, 2015 Extension	Oct. 31, 2014 USD ($)	Feb. 11, 2014 USD ($) Extension	Jan. 24, 2013 USD ($) Financing_Counterparty	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) agreement	Jun. 30, 2014 USD ($) agreement	Dec. 31, 2014 USD ($)	Oct. 30, 2014 USD ($)	Apr. 29, 2014 USD ($)	Apr. 28, 2014 USD ($)
FINANCING
Amortization of premiums								$ (431,000)	$ (306,000)
Restricted equity from payment as dividend						$ 900,300,000		900,300,000
Tuebor
FINANCING
Amount restricted from transfer						378,800,000		378,800,000
Revolving credit facility | One-Month LIBOR
FINANCING
Committed amount on credit agreement				$ 75,000,000
Debt borrowings term				3 years
Number of twelve-month extension maturity periods | Extension				2
Length of extension options				12 months
Basis spread on variable rate (as a percent)				3.50%
Letters of credit
FINANCING
Committed amount on credit agreement				$ 25,000,000
Term master repurchase agreement
FINANCING
Committed amount on master repurchase agreement						300,000,000		$ 300,000,000
Committed master repurchase agreements
FINANCING
Number of agreements | agreement								3
Committed amount on master repurchase agreement						1,300,000,000		$ 1,300,000,000		$ 1,150,000,000	$ 450,000,000	$ 450,000,000	$ 300,000,000
Uncommitted securities repurchase facilities | Minimum
FINANCING
Advance rates (as a percent)								65.00%
Uncommitted securities repurchase facilities | Maximum
FINANCING
Advance rates (as a percent)								95.00%
Maturity 30 to 90 Days | Committed master repurchase agreements
FINANCING
Committed amount on master repurchase agreement											$ 650,000,000
Maturing April 10, 2019 | Term master repurchase agreement
FINANCING
Number of extension executed | Extension		1
Credit Agreement
FINANCING
Committed amount on credit agreement					$ 50,000,000
Number of multiple committed financing counterparties | Financing_Counterparty					1
Credit Agreement | One-Month LIBOR
FINANCING
Basis spread on variable rate (as a percent)					2.75%
Mortgage loan financing
FINANCING
Number of agreements | agreement								20	1
Stated interest rate, minimum (as a percent)								4.25%
Borrowing under credit and security agreement						529,100,000		$ 529,100,000
Stated interest rate, maximum (as a percent)								6.75%
Mortgage loan financing										447,400,000
Net unamortized premiums						7,100,000		$ 7,100,000		5,300,000
Amortization of premiums						200,000	$ 200,000	400,000	$ 300,000
Pledged Assets, Not Separately Reported, Real Estate and Lease Intangibles, Net						691,000,000		$ 691,000,000		$ 591,600,000
Borrowings from the Federal Home Loan Bank | Tuebor
FINANCING
Debt borrowings term								9 years		10 years
Stated interest rate, minimum (as a percent)								0.25%		0.30%
Stated interest rate, maximum (as a percent)								2.74%		2.74%
Maximum advance limit	$ 2,900,000,000
FHLB borrowings outstanding						1,800,000,000		$ 1,800,000,000		$ 1,600,000,000
Additional committed term financing available from FHLB						507,800,000		$ 507,800,000		$ 289,000,000
Borrowings from the Federal Home Loan Bank | Tuebor | Ladder Capital Corp
FINANCING
Advance rates of total assets (as a percent)	40.00%
Advance rates of total equity (as a percent)	150.00%
Borrowings from the Federal Home Loan Bank | Tuebor | Minimum
FINANCING
Advance rates (as a percent)								48.80%		50.00%
Borrowings from the Federal Home Loan Bank | Tuebor | Maximum
FINANCING
Advance rates (as a percent)								95.20%		95.20%
Borrowings from the Federal Home Loan Bank | Tuebor | CMBS and U.S. Agency Securities
FINANCING
Collateral for debt instrument						1,600,000,000		$ 1,600,000,000		$ 1,600,000,000
Borrowings from the Federal Home Loan Bank | Tuebor | First mortgage commercial real estate loans
FINANCING
Collateral for debt instrument						$ 704,600,000		$ 704,600,000		$ 451,800,000
Credit and Security Agreement
FINANCING
Debt issued			$ 46,750,000
Credit and Security Agreement | One-Month LIBOR
FINANCING
Basis spread on variable rate (as a percent)			1.85%