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Derivative Instruments and Hedging Activities - Components of Realized and Unrealized Gains and Losses (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gains (Losses)	$ 1,192	$ 1,563	$ 1,687	$ (1,594)
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	949	3,769	3,135	7,775
Unrealized Gains (Losses)	486	795	(918)	431
Not Designated as Hedging Instrument | TBA securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	1,470	4,981	3,285	13,489
Unrealized Gains (Losses)	(265)	(2,547)	(1,080)	883
Not Designated as Hedging Instrument | Eurodollar futures
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	62	(1,674)	849	(3,180)
Unrealized Gains (Losses)	$ 39	3,877	$ (886)	547
Number of contracts | contract	1,640		1,640
Not Designated as Hedging Instrument | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	$ 0	0	$ 0	0
Unrealized Gains (Losses)	36	65	110	40
Not Designated as Hedging Instrument | Swaptions
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	0	0	0
Unrealized Gains (Losses)	171	190	239	212
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)	(583)	462	(999)	(2,534)
Unrealized Gains (Losses)	$ 505	$ (790)	$ 699	$ (1,251)

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The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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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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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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