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Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
TBA Securities
Derivative [Line Items]
Derivatives not designated as hedging instruments - assets	$ 0	$ 148,139
Eurodollar futures
Derivative [Line Items]
Derivatives not designated as hedging instruments - assets	0	1,175
Interest rate swap futures
Derivative [Line Items]
Derivatives not designated as hedging instruments - assets	0	444
Swaptions
Derivative [Line Items]
Derivatives not designated as hedging instruments - assets	0	431
U.S. Treasury futures
Derivative [Line Items]
Derivatives not designated as hedging instruments - liabilities	0	107
Interest rate swaps
Derivative [Line Items]
Derivatives not designated as hedging instruments - assets	846	0
Derivatives not designated as hedging instruments - liabilities	$ 0	$ 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

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+ References

No definition available.

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