FAIR VALUE MEASUREMENT - Securities Valuation Methodology and Results (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) source
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Outstanding Face Amount	$ 14,778,190
Amortized Cost Basis	7,164,388
Total Fair Value	$ 7,585,323
Number of broker quotation sources \| source	2
Percent of securities	81.80%
Multiple Quotes
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 7,578,235
Single Quote
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	7,088
Single Quote \| Seller
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	6,700
Agency RMBS
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Outstanding Face Amount	1,221,259
Amortized Cost Basis	1,217,176
Agency RMBS \| Level 2
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	1,214,115
Agency RMBS \| Level 2 \| Multiple Quotes
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	1,214,115
Agency RMBS \| Level 2 \| Single Quote
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	0
Non-Agency RMBS
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Outstanding Face Amount	13,556,931
Amortized Cost Basis	5,947,212
Fair Value	5,210,885
Non-Agency RMBS \| Level 3
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	6,371,208
Non-Agency RMBS \| Level 3 \| Multiple Quotes
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	6,364,120
Non-Agency RMBS \| Level 3 \| Single Quote
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 7,088
Minimum \| Non-Agency RMBS
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount Rate	2.66%
Prepayment Speed	0.25%
Delinquency	0.15%
Loss Severity	5.00%
Maximum \| Non-Agency RMBS
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount Rate	28.00%
Prepayment Speed	22.00%
Delinquency	9.00%
Loss Severity	100.00%

Fair Value Measurements, Percentage of Instruments with Ranges of Assumptions Used Available

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Number Of Broker Quotation Sources

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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.

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Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value.

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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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Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

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For investments which are quantified by principal amount, the principle balance held at close of period.

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Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

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