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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Schedule of Investments [Line Items] |  |  |  |
Investment Securities average remaining life |  |  | 5 years 1 month |
Available-for-sale Securities and Held-to-maturity Securities | 0 | 468 | 0 | 468
Other than Temporary Impairment Losses, Investments | $ 0 |  | $ 0 | $ 0
Asset backed securities mortgage portfolio, term |  |  | 15 years |
Gain (Loss) on Sale of Investments |  |  |  | $ 20,000
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 | $ 588,900,000 |  | $ 588,900,000 |
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Minimum [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available for Sale Securities, Debt Maturities, Term |  |  | 2 years |
U.S. Treasury And Sponsored Entities Callable Notes [Member] | Maximum [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available for Sale Securities, Debt Maturities, Term |  |  | 8 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=51813488&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=49167202&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=27724398&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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