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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Schedule of Investments [Line Items] |  |  |  |
Investment Securities average remaining life |  |  | 3 years 6 months 22 days |
Other than Temporary Impairment Losses, Investments | $ 0 |  | $ 0 | $ 0
Available-for-sale Securities, Gross Realized Gains | 0.000 | $ 0.000 | $ 0.000 |
Asset backed securities mortgage portfolio, term |  |  | 15 years |
U.S. Treasury And Sponsored Entities Callable Notes [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available for Sale expected to be called | 265,400,000 |  | $ 265,400,000 |
Available-for-sale securities | $ 360,400,000 |  | $ 360,400,000 |
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Minimum [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available for Sale Securities, Debt Maturities, Term |  |  | 1 year |
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Maximum [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available for Sale Securities, Debt Maturities, Term |  |  | 6 years |

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