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Derivative Financial Instruments (Balance Sheet Information) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ (27)	$ 343
Investments-trading [Member] | TBA And Other Forward Agency MBS [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	1,158	1,928
Investments-trading [Member] | Other Extended Settlement Trades [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		2
Other Investment at Fair Value [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(4)	83
Trading securities sold, not yet purchased [Member] | TBA And Other Forward Agency MBS [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ (1,181)	(1,666)
Trading securities sold, not yet purchased [Member] | Other Extended Settlement Trades [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		$ (4)

X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

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X

- 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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