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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value |  | $ 781,661
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  | 38,173
Securities Available-for-Sale, 12 months or longer, Fair value | 740,275 | 169,082
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 25,402 | 17,313
Securities Available-for-Sale, Fair value, Total | 740,275 | 950,743
Securities Available-for-Sale, Unrealized losses, Total | 25,402 | 55,486
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value |  | 377,626
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  | 29,256
Securities Available-for-Sale, 12 months or longer, Fair value | 551,159 | 147,510
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 19,476 | 16,240
Securities Available-for-Sale, Fair value, Total | 551,159 | 525,136
Securities Available-for-Sale, Unrealized losses, Total | 19,476 | 45,496
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value |  | 404,035
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  | 8,917
Securities Available-for-Sale, 12 months or longer, Fair value | 189,116 | 21,572
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 5,926 | 1,073
Securities Available-for-Sale, Fair value, Total | 189,116 | 425,607
Securities Available-for-Sale, Unrealized losses, Total | 5,926 | 9,990
Securities Held-to-Maturity, Less than 12 months, Fair value | 65,552 | 5,781
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 430 | 42
Securities Held-to-Maturity, 12 months or longer, Fair value | 3,342 |
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 32 |
Securities Held-to-Maturity, Fair value, Total | 68,894 | 5,781
Securities Held-to-Maturity, Unrealized losses, Total | $ 462 | $ 42

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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