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Derivative Instruments and Hedging Activities - Components of Realized and Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gains (Losses)	$ 11,692	$ 1,546
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	498
Unrealized Gains (Losses)	8,969	(134)
Not Designated as Hedging Instrument | TBA securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	(215)
Unrealized Gains (Losses)	0	200
Not Designated as Hedging Instrument | Eurodollar futures
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	555
Unrealized Gains (Losses)	0	(380)
Not Designated as Hedging Instrument | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	0
Unrealized Gains (Losses)	8,969	26
Not Designated as Hedging Instrument | Swaptions
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	0
Unrealized Gains (Losses)	0	(87)
Not Designated as Hedging Instrument | U.S. Treasury and interest rate swap futures and options
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	158
Unrealized Gains (Losses)	$ 0	$ 107

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- Definition

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+ References

No definition available.

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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