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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Quantitative Information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Carrying Value	$ 2,415,382	$ 2,815,565
CMBS | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Carrying Value	$ 1,985,195	$ 2,305,409
CMBS | Minimum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	(23.70%)	(13.06%)
CMBS | Weighted Average | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	1.51%	2.36%
Duration	4 years 2 months 23 days	4 years 8 months 4 days
CMBS | Maximum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	5.27%	5.49%
Duration	8 years 1 month 9 days	8 years 3 months 3 days
CMBS interest-only | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Carrying Value	$ 356,928	$ 378,335
CMBS interest-only | Minimum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	2.06%	(27.49%)
Duration	1 month 13 days	5 months 26 days
Prepayment speed	100.00%	100.00%
CMBS interest-only | Weighted Average | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	3.65%	(4.93%)
Duration	3 years 5 months 1 day	3 years 6 months
Prepayment speed	100.00%	100.00%
CMBS interest-only | Maximum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	14.84%	23.32%
Duration	4 years 4 months 9 days	4 years 8 months 23 days
Prepayment speed	100.00%	100.00%
GNMA interest-only | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Carrying Value	$ 28,603	$ 66,642
GNMA interest-only | Minimum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	(3.64%)	(0.85%)
Duration	5 months 19 days
Prepayment speed	5.00%	5.00%
GNMA interest-only | Weighted Average | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	4.82%	5.90%
Duration	5 years 5 months 23 days	4 years 6 months
Prepayment speed	14.43%	14.99%
GNMA interest-only | Maximum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	82.81%	54.24%
Duration	34 years 6 months 7 days	6 years 3 months 10 days
Prepayment speed	35.00%	35.00%
GN construction securities | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Carrying Value	$ 27,849	$ 28,406
GN construction securities | Minimum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	0.32%	0.33%
Duration	1 year 10 months 27 days	1 year 11 months 12 days
GN construction securities | Weighted Average | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	3.62%	3.54%
Duration	9 years 5 months 15 days	9 years 5 months 1 day
GN construction securities | Maximum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	3.67%	3.70%
Duration	9 years 6 months 25 days	10 years 7 days
GN permanent securities | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Carrying Value	$ 16,807	$ 36,773
GN permanent securities | Minimum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	2.53%	0.00%
Duration	1 year 10 months 6 days	14 days
GN permanent securities | Weighted Average | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	3.76%	1.28%
Duration	6 years 1 month 2 days	1 year 3 months 25 days
GN permanent securities | Maximum | Discounted Cash Flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	6.35%	6.43%
Duration	9 years 3 months 10 days	9 years 3 months 7 days

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Represents the remaining maturity period, used as an input to measure fair value.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 2



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Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Topic 820



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Fair value of asset after deduction of liability.

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