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COMMITMENTS AND CONTINGENCIES (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2014 USD ($) | Dec. 31, 2012 Extension_Option | Dec. 31, 2011 Extension_Option | Dec. 31, 2014 USD ($) $ / shares
Unfunded Loan Commitments |  |  |  |  |  |  |
Number of extension options | Extension_Option |  |  |  |  | 0 | 0 |
Rent expense | $ 300,000 | $ 600,000 | $ 1,200,000 | $ 1,500,000 |  |  |
Mortgage loan receivables held for investment |  |  |  |  |  |  |
Unfunded Loan Commitments |  |  |  |  |  |  |
Unfunded commitments of mortgage loan receivables held for investment | 110,600,000 |  | 110,600,000 |  |  |  | $ 158,100,000
First mortgage loan financing |  |  |  |  |  |  |
Unfunded Loan Commitments |  |  |  |  |  |  |
Unfunded commitments of mortgage loan receivables held for investment | 109,200,000 |  | 109,200,000 |  |  |  | 155,500,000
Mezzanine loan financing |  |  |  |  |  |  |
Unfunded Loan Commitments |  |  |  |  |  |  |
Unfunded commitments of mortgage loan receivables held for investment | $ 1,400,000 |  | $ 1,400,000 |  |  |  | 2,600,000
Commitment to purchase GN construction loan securities |  |  |  |  |  |  |
Unfunded Loan Commitments |  |  |  |  |  |  |
Fixed prices (in dollars per unit) | $ / shares | $ 102.0 |  | $ 102.0 |  |  |  |
Commitment to purchase loan securities | $ 28,800,000 |  | $ 28,800,000 |  |  |  | 60,000,000
Funded | 26,300,000 |  | 26,300,000 |  |  |  | 49,400,000
Remaining to be funded | 2,500,000 |  | 2,500,000 |  |  |  | 10,600,000
Fair value of commitments | $ 36,800 |  | $ 36,800 |  |  |  | $ 63,614
Commitment to purchase GN construction loan securities | Minimum |  |  |  |  |  |  |
Unfunded Loan Commitments |  |  |  |  |  |  |
Period over which commitment is made to purchase loan securities |  |  | 6 months |  |  |  |
Fixed prices (in dollars per unit) | $ / shares |  |  |  |  |  |  | $ 102.0
Commitment to purchase GN construction loan securities | Maximum |  |  |  |  |  |  |
Unfunded Loan Commitments |  |  |  |  |  |  |
Period over which commitment is made to purchase loan securities |  |  | 12 months |  |  |  |
Fixed prices (in dollars per unit) | $ / shares |  |  |  |  |  |  | $ 104.4

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