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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Schedule of Investments [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% |  |
Tax Equivalent Interest Adjustment |  | $ 2,700,000 |  |
Investment Securities average remaining life |  | 4 years 4 months |  |
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 |  |
Available-for-sale Securities Pledged as Collateral | 933,000,000 | $ 933,000,000 |  | $ 937,000,000
U.S. Treasury And Sponsored Entities Callable Notes [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available for Sale expected to be called | 0 | 0 |  |
Available-for-sale securities | $ 268,800,000 | $ 268,800,000 |  |
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Minimum [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available for Sale Securities, Debt Maturities, Term |  | 31 days |  |
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Maximum [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available for Sale Securities, Debt Maturities, Term |  | 2 years 273 days |  |

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