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DERIVATIVE INSTRUMENTS - Schedule of Derivatives Outstanding (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Derivative [Line Items] |  |
Notional | $ 1,228,700,000 | $ 1,553,750,000
Fair value, Asset | 299,000 | 423,000
Fair value, Liability | 21,942,000 | 13,445,000
1MO LIBOR |  |
Derivative [Line Items] |  |
Notional |  | 71,250,000
Fair value, Asset |  | 0
Fair value, Liability |  | $ 0
Remaining Maturity |  | 7 months 27 days
5-year Swap |  |
Derivative [Line Items] |  |
Notional | 591,800,000 | $ 496,200,000
Fair value, Asset | 8,000 | 108,000
Fair value, Liability | $ 6,575,000 | $ 28,000
Remaining Maturity | 3 months | 3 months
Term of derivative contract | 5 years | 5 years
10-year Swap |  |
Derivative [Line Items] |  |
Notional | $ 513,400,000 | $ 842,800,000
Fair value, Asset | 2,000 | 104,000
Fair value, Liability | $ 9,976,000 | $ 8,258,000
Remaining Maturity | 3 months | 3 months
Term of derivative contract | 10 years | 10 years
Futures |  |
Derivative [Line Items] |  |
Notional | $ 1,105,200,000 | $ 1,339,000,000
Fair value, Asset | 10,000 | 212,000
Fair value, Liability | 16,551,000 | 8,286,000
Swaps 3MO LIB |  |
Derivative [Line Items] |  |
Notional | 80,000,000 | 100,000,000
Fair value, Asset | 0 | 0
Fair value, Liability | $ 5,026,000 | $ 4,505,000
Remaining Maturity | 3 years 2 months 26 days | 3 years 2 months 4 days
CMBX |  |
Derivative [Line Items] |  |
Notional | $ 33,500,000 | $ 10,000,000
Fair value, Asset | 0 | 211,000
Fair value, Liability | $ 365,000 | $ 0
Remaining Maturity | 3 years 3 months 21 days | 6 years 9 months 18 days
CDX |  |
Derivative [Line Items] |  |
Notional | $ 10,000,000 | $ 33,500,000
Fair value, Asset | 289,000 | 0
Fair value, Liability | $ 0 | $ 654,000
Remaining Maturity | 5 years 9 months 3 days | 3 years 11 months 19 days
Credit Derivatives |  |
Derivative [Line Items] |  |
Notional | $ 43,500,000 | $ 43,500,000
Fair value, Asset | 289,000 | 211,000
Fair value, Liability | $ 365,000 | $ 654,000

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