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REAL ESTATE SECURITIES - Summary of Securities (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) securities | Dec. 31, 2014 USD ($) securities
Schedule of Available-for-sale Securities [Line Items] |  |
Outstanding Face Amount | $ 9,888,419 | $ 10,950,979
Amortized Cost Basis | 2,390,857 | 2,786,317
Gross Unrealized Gains | 28,576 | 33,222
Gross Unrealized Losses | (4,051) | (3,973)
Carrying Value | $ 2,415,382 | $ 2,815,566
Number of of Securities | securities | 202 | 235
Weighted Average Coupon % | 1.37% | 1.50%
Weighted Average Yield % | 3.56% | 4.54%
Remaining Duration (years) | 3 years 7 months 2 days | 3 years 9 months
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Outstanding Face Amount | $ 1,936,316 | $ 2,247,565
Amortized Cost Basis | 1,960,371 | 2,277,995
Gross Unrealized Gains | 25,897 | 28,453
Gross Unrealized Losses | (1,073) | (1,038)
Carrying Value | $ 1,985,195 | $ 2,305,410
Number of of Securities | securities | 120 | 145
Weighted Average Coupon % | 3.25% | 3.31%
Weighted Average Yield % | 2.63% | 2.60%
Remaining Duration (years) | 3 years 4 months 6 days | 4 years 2 months 23 days
CMBS interest-only |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Outstanding Face Amount | $ 7,246,777 | $ 7,239,503
Amortized Cost Basis | 356,204 | 376,085
Gross Unrealized Gains | 1,726 | 2,973
Gross Unrealized Losses | (1,002) | (723)
Carrying Value | $ 356,928 | $ 378,335
Number of of Securities | securities | 47 | 41
Weighted Average Coupon % | 0.90% | 1.04%
Weighted Average Yield % | 3.74% | 4.88%
Remaining Duration (years) | 3 years 5 months 15 days | 3 years 5 months 12 days
GNMA interest-only |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Outstanding Face Amount | $ 662,161 | $ 1,400,141
Amortized Cost Basis | 30,109 | 67,544
Gross Unrealized Gains | 77 | 1,035
Gross Unrealized Losses | (1,583) | (1,937)
Carrying Value | $ 28,603 | $ 66,642
Number of of Securities | securities | 21 | 34
Weighted Average Coupon % | 0.81% | 0.85%
Weighted Average Yield % | 4.27% | 5.90%
Remaining Duration (years) | 5 years 5 months 23 days | 4 years 6 months
GN construction securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Outstanding Face Amount | $ 26,730 | $ 27,538
Amortized Cost Basis | 27,223 | 28,178
Gross Unrealized Gains | 589 | 503
Gross Unrealized Losses | 37 | (275)
Carrying Value | $ 27,849 | $ 28,406
Number of of Securities | securities | 2 | 4
Weighted Average Coupon % | 4.10% | 3.89%
Weighted Average Yield % | 3.86% | 3.56%
Remaining Duration (years) | 9 years 5 months 15 days | 9 years 5 months 1 day
GN permanent securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Outstanding Face Amount | $ 16,435 | $ 36,232
Amortized Cost Basis | 16,950 | 36,515
Gross Unrealized Gains | 287 | 258
Gross Unrealized Losses | (430) | 0
Carrying Value | $ 16,807 | $ 36,773
Number of of Securities | securities | 12 | 11
Weighted Average Coupon % | 4.55% | 5.49%
Weighted Average Yield % | 4.00% | 4.94%
Remaining Duration (years) | 6 years 1 month 2 days | 1 year 3 months 25 days

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