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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Schedule of Investments [Line Items] |  |
Investment Securities average remaining life | 3 years 11 months 2 days |
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0
Available-for-sale Securities, Gross Realized Gains | $ 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 | $ 150,000,000 |
Available-for-sale securities | $ 421,900,000 |
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 | 7 years |

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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