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Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Eurodollar futures
Derivative [Line Items]
Derivative assets	$ 289	$ 1,175
TBA securities
Derivative [Line Items]
Derivative assets	180,562	148,139
Interest rate swap futures
Derivative [Line Items]
Derivative assets	1,228	444
Swaptions
Derivative [Line Items]
Derivative assets	18	431
U.S. Treasury futures
Derivative [Line Items]
Derivative liabilities	193	107
Interest rate swaps
Derivative [Line Items]
Derivative liabilities	$ 274	$ 384

X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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