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DEBT OBLIGATIONS (Details) |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 14, 2015 Extension | Jun. 26, 2015 USD ($) | Apr. 10, 2015 Extension | Feb. 19, 2015 Extension | Oct. 31, 2014 USD ($) | Feb. 11, 2014 USD ($) Extension | Jan. 24, 2013 USD ($) Financing_Counterparty | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) agreement | Sep. 30, 2014 USD ($) agreement | Dec. 31, 2014 USD ($) | Oct. 30, 2014 USD ($) | Apr. 29, 2014 USD ($) | Apr. 28, 2014 USD ($)
FINANCING |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of premiums |  |  |  |  |  |  |  |  |  | $ (678,000) | $ (471,000) |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  |  | $ 7,600,000 |  | 7,600,000 |  | $ 9,400,000 |  |  |
Restricted equity from payment as dividend |  |  |  |  |  |  |  | 900,300,000 |  | 900,300,000 |  |  |  |  |
Tuebor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FINANCING |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount restricted from transfer |  |  |  |  |  |  |  | 414,200,000 |  | 414,200,000 |  |  |  |  |
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 |  |  |  |  |
Number of extension executed | Extension |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Committed master repurchase agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FINANCING |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreements | agreement |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Committed amount on master repurchase agreement |  |  |  |  |  |  |  | 1,450,000,000 |  | $ 1,450,000,000 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |
Maturing on October 30, 2016 | Committed master repurchase agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FINANCING |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed amount on master repurchase agreement |  |  |  |  |  |  |  | 600,000,000 |  | $ 600,000,000 |  | $ 450,000,000 |  |  |
Number of extension executed | Extension | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of extension options |  |  |  |  |  |  |  |  |  | 12 months |  | 12 months |  |  |
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 |  |  |  |  |  |  |  |  |  | 36 | 5 |  |  |  |
Stated interest rate, minimum (as a percent) |  |  |  |  |  |  |  |  |  | 4.25% |  |  |  |  |
Borrowing under credit and security agreement |  |  |  |  |  |  |  | 555,800,000 |  | $ 555,800,000 |  |  |  |  |
Stated interest rate, maximum (as a percent) |  |  |  |  |  |  |  |  |  | 6.75% |  |  |  |  |
Mortgage loan financing |  |  |  |  |  |  |  |  |  |  |  | $ 447,400,000 |  |  |
Net unamortized premiums |  |  |  |  |  |  |  | 7,000,000 |  | $ 7,000,000 |  | 5,300,000 |  |  |
Amortization of premiums |  |  |  |  |  |  |  | 200,000 | $ 200,000 | 700,000 | $ 500,000 |  |  |  |
Pledged assets, real estate and lease intangibles, net |  |  |  |  |  |  |  | $ 723,400,000 |  | $ 723,400,000 |  | $ 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) |  |  |  |  |  |  |  |  |  | 0.27% |  | 0.30% |  |  |
Stated interest rate, maximum (as a percent) |  |  |  |  |  |  |  |  |  | 2.74% |  | 2.74% |  |  |
Weighted average interest rate |  |  |  |  |  |  |  | 0.83% |  | 0.83% |  | 0.79% |  |  |
Weighted average term |  |  |  |  |  |  |  |  |  | 1 year 7 months 13 days |  | 2 years 18 days |  |  |
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 |  |  |  |  |  |  |  | 462,700,000 |  | $ 462,700,000 |  | $ 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) |  |  |  |  |  |  |  |  |  | 50.00% |  | 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 |  |  |  |  |  |  |  | 1,700,000,000 |  | $ 1,700,000,000 |  | $ 1,600,000,000 |  |  |
Borrowings from the Federal Home Loan Bank | Tuebor | First mortgage commercial real estate loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FINANCING |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral for debt instrument |  |  |  |  |  |  |  | 523,300,000 |  | 523,300,000 |  | 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% |  |  |  |  |  |  |  |  |  |
Credit Agreement and Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FINANCING |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  |  | $ 3,700,000 |  | $ 3,700,000 |  | $ 4,000,000 |  |  |

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