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REAL ESTATE SECURITIES - Securities by Remaining Maturity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Within 1 year | $ 604,328 |  | $ 604,328 |  | $ 502,019
1-5 years | 1,151,625 |  | 1,151,625 |  | 1,237,641
5-10 years | 658,868 |  | 658,868 |  | 1,053,190
After 10 years | 561 |  | 561 |  | 22,716
Fair value of real estate securities | 2,415,382 |  | 2,415,382 |  | 2,815,566
Other than temporary impairments included in consolidated statements of income | (200) | $ (500) | (1,600) | $ (2,100) |
CMBS |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Within 1 year | 604,249 |  | 604,249 |  | 474,357
1-5 years | 776,565 |  | 776,565 |  | 814,702
5-10 years | 604,381 |  | 604,381 |  | 1,016,351
After 10 years | 0 |  | 0 |  | 0
Fair value of real estate securities | 1,985,195 |  | 1,985,195 |  | 2,305,410
CMBS interest-only |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Within 1 year | 70 |  | 70 |  | 391
1-5 years | 356,858 |  | 356,858 |  | 370,993
5-10 years | 0 |  | 0 |  | 6,951
After 10 years | 0 |  | 0 |  | 0
Fair value of real estate securities | 356,928 |  | 356,928 |  | 378,335
GNMA interest-only |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Within 1 year | 9 |  | 9 |  | 1,356
1-5 years | 8,929 |  | 8,929 |  | 42,105
5-10 years | 19,104 |  | 19,104 |  | 23,181
After 10 years | 561 |  | 561 |  | 0
Fair value of real estate securities | 28,603 |  | 28,603 |  | 66,642
GN construction securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Within 1 year | 0 |  | 0 |  | 0
1-5 years | 414 |  | 414 |  | 507
5-10 years | 27,435 |  | 27,435 |  | 5,183
After 10 years | 0 |  | 0 |  | 22,716
Fair value of real estate securities | 27,849 |  | 27,849 |  | 28,406
GN permanent securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Within 1 year | 0 |  | 0 |  | 25,915
1-5 years | 8,859 |  | 8,859 |  | 9,334
5-10 years | 7,948 |  | 7,948 |  | 1,524
After 10 years | 0 |  | 0 |  | 0
Fair value of real estate securities | $ 16,807 |  | $ 16,807 |  | $ 36,773

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