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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)

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