DEBT OBLIGATIONS (Details)									3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 21, 2016 USD ($)	Oct. 25, 2015 USD ($) Extension	Aug. 14, 2015 USD ($) Extension	Apr. 10, 2015 USD ($) Extension	Feb. 19, 2015 Extension	Oct. 31, 2014 USD ($)	Feb. 11, 2014 USD ($) Extension	Jan. 24, 2013 USD ($) Financing_Counterparty	Jun. 30, 2016 USD ($) counterparty Extension	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) agreement counterparty Extension	Jun. 30, 2015 USD ($) agreement	Dec. 31, 2015 USD ($) Extension	Jul. 01, 2016 USD ($)	Jun. 28, 2016 USD ($)	Feb. 19, 2016
Committed Loan and Securities Repurchase Facilities
Debt obligations outstanding									$ 1,139,615,000		$ 1,139,615,000		$ 1,260,755,000
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Restricted equity from payment as dividend									$ 900,300,000		900,300,000
Mortgage Loans on Real Estate [Abstract]
Amortization of premiums											$ (437,000)	$ (431,000)
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Percent of FHLB advances to total debt obligations outstanding									46.60%		46.60%
Tuebor
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Amount restricted from transfer									$ 489,700,000		$ 489,700,000
Revolving credit facility | One-Month LIBOR
Committed Loan and Securities Repurchase Facilities
Number of extension maturity periods | Extension							2
Length of extension options							12 months
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Basis spread on variable rate (as a percent)							3.50%
Committed amount on credit agreement							$ 143,000,000
Debt borrowings term							3 years
Letters of credit
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Committed amount on credit agreement							$ 25,000,000
Term master repurchase agreement
Committed Loan and Securities Repurchase Facilities
Committed amount on master repurchase agreement									300,000,000		$ 300,000,000
Number of extension executed | Extension					1
Committed Loan repurchase facility
Committed Loan and Securities Repurchase Facilities
Number of agreements | agreement											5
Committed amount on master repurchase agreement									1,585,000,000		$ 1,585,000,000		1,485,000,000
Debt obligations outstanding									513,229,000		513,229,000		704,149,000
Total Repurchase Facilities
Committed Loan and Securities Repurchase Facilities
Committed amount on master repurchase agreement									1,885,000,000		1,885,000,000		1,785,000,000
Debt obligations outstanding									$ 1,139,615,000		$ 1,139,615,000		1,260,755,000
Total Repurchase Facilities | Deutshe Bank, J.P. Morgan and Wells Fargo
Committed Loan and Securities Repurchase Facilities
Repurchase agreements, number of counterparties | counterparty									7		7
Excess collateral over amounts borrowed under repurchase agreements									$ 74,300,000		$ 74,300,000
Ratio indebtedness over total equity (as a percent)											5.00%
Haircut on repurchase agreements (as a percent)									32.70%		32.70%
Uncommitted securities Repurchase Facilities | Minimum
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates (as a percent)											65.00%
Uncommitted securities Repurchase Facilities | Maximum
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates (as a percent)											95.00%
1/2016 | Uncommitted securities Repurchase Facilities
Committed Loan and Securities Repurchase Facilities
Debt obligations outstanding													394,719,000
5/24/2016 | Committed Loan repurchase facility
Committed Loan and Securities Repurchase Facilities
Committed amount on master repurchase agreement													$ 450,000,000
Number of extension maturity periods | Extension													2
Length of extension options													12 months
Debt obligations outstanding													$ 269,779,000
4/10/2019 | Term master repurchase agreement
Committed Loan and Securities Repurchase Facilities
Number of extension executed | Extension				1
4/9/2017 | Committed Loan repurchase facility
Committed Loan and Securities Repurchase Facilities
Committed amount on master repurchase agreement				$ 400,000,000					$ 400,000,000		$ 400,000,000
Number of extension maturity periods | Extension									2		2
Length of extension options											364 days
Debt obligations outstanding									$ 110,735,000		$ 110,735,000
10/30/2016 | Committed Loan repurchase facility
Committed Loan and Securities Repurchase Facilities
Committed amount on master repurchase agreement			$ 600,000,000						$ 600,000,000		$ 600,000,000		$ 600,000,000
Number of extension executed | Extension			1
Number of extension maturity periods | Extension									2		2		2
Length of extension options											12 months		12 months
Debt obligations outstanding									$ 282,099,000		$ 282,099,000		$ 229,533,000
10/24/2016 | Committed Loan repurchase facility
Committed Loan and Securities Repurchase Facilities
Committed amount on master repurchase agreement		$ 35,000,000							$ 35,000,000		$ 35,000,000		$ 35,000,000
Number of extension maturity periods | Extension		2							2		2		2
Length of extension options		6 months									6 months		6 months
Debt obligations outstanding									$ 4,352,000		$ 4,352,000		$ 575,000
6/28/2019 | Committed Loan repurchase facility
Committed Loan and Securities Repurchase Facilities
Committed amount on master repurchase agreement									100,000,000		100,000,000				$ 100,000,000.0
Debt obligations outstanding									0		$ 0
Credit Agreement
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Committed amount on credit agreement								$ 50,000,000
Number of multiple committed financing counterparties | Financing_Counterparty								1
Mortgage loan financing
Committed Loan and Securities Repurchase Facilities
Number of agreements | agreement											4	20
Mortgage Loans on Real Estate [Abstract]
Borrowing under credit and security agreement									547,000,000		$ 547,000,000
Mortgage loan financing													544,700,000
Net unamortized premiums									5,800,000		5,800,000		6,100,000
Amortization of premiums									200,000	$ 200,000	400,000	$ 400,000
Pledged assets, real estate and lease intangibles, net									711,400,000		$ 711,400,000		$ 711,100,000
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Stated interest rate, minimum (as a percent)											4.25%
Stated interest rate, maximum (as a percent)											6.75%
Borrowings from the Federal Home Loan Bank | Tuebor
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Debt borrowings term											8 years		8 years
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Maximum advance limit	$ 2,900,000,000
Stated interest rate, minimum (as a percent)											0.38%		0.28%
Stated interest rate, maximum (as a percent)											2.74%		2.74%
FHLB borrowings outstanding									2,000,000,000		$ 2,000,000,000		$ 1,900,000,000
Additional committed term financing available from FHLB									$ 179,400,000		$ 179,400,000		$ 380,400,000
Weighted average term											2 years 4 months 13 days		1 year 5 months 1 day
Weighted average interest rate									0.97%		0.97%		0.84%
Maximum percent of FHLB advances to total assets																40.00%
Borrowings from the Federal Home Loan Bank | Tuebor | Ladder Capital Corp
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
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
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates (as a percent)											62.50%		58.70%
Borrowings from the Federal Home Loan Bank | Tuebor | Maximum
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates (as a percent)											95.20%		95.20%
Borrowings from the Federal Home Loan Bank | Tuebor | CMBS and U.S. Agency Securities
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Collateral for debt instrument									$ 1,900,000,000		$ 1,900,000,000		$ 1,700,000,000
Borrowings from the Federal Home Loan Bank | Tuebor | First mortgage commercial real estate loans
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Collateral for debt instrument									636,900,000		636,900,000		568,200,000
Credit and Security Agreement
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Debt instrument, aggregate amount						$ 46,750,000
Credit and Security Agreement | One-Month LIBOR
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Basis spread on variable rate (as a percent)						1.85%
Credit Agreement and Revolving Credit Facility
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Unamortized debt issuance costs									$ 2,000,000		$ 2,000,000		$ 3,400,000
Subsequent Event | 7/1/2018 | Term master repurchase agreement
Committed Loan and Securities Repurchase Facilities
Committed amount on master repurchase agreement														$ 400,000,000.0