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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | $ 544,951 | $ 860,016
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 4,848 | 11,778
Securities Available-for-Sale, 12 months or longer, Fair value | 307,379 | 47,163
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 1,719 | 531
Securities Available-for-Sale, Fair value, Total | 852,330 | 907,179
Securities Available-for-Sale, Unrealized losses, Total | 6,567 | 12,309
Securities Held-to-Maturity, Less than 12 months, Fair value | 97,120 | 134,909
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 1,247 | 5,148
Securities Held-to-Maturity, 12 months or longer, Fair value | 20,406 | 7,564
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 391 | 87
Securities Held-to-Maturity, Fair value, Total | 117,526 | 142,473
Securities Held-to-Maturity, Unrealized losses, Total | 1,638 | 5,235
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 | 24,967 | 247,695
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 33 | 2,305
Securities Available-for-Sale, 12 months or longer, Fair value | 243,874 | 19,838
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 1,126 | 162
Securities Available-for-Sale, Fair value, Total | 268,841 | 267,533
Securities Available-for-Sale, Unrealized losses, Total | 1,159 | 2,467
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 519,984 | 612,321
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 4,815 | 9,473
Securities Available-for-Sale, 12 months or longer, Fair value | 63,505 | 27,325
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 593 | 369
Securities Available-for-Sale, Fair value, Total | 583,489 | 639,646
Securities Available-for-Sale, Unrealized losses, Total | 5,408 | 9,842
Securities Held-to-Maturity, 12 months or longer, Fair value | 7,423 | 7,564
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 15 | 87
Securities Held-to-Maturity, Fair value, Total | 7,423 | 7,564
Securities Held-to-Maturity, Unrealized losses, Total | 15 | 87
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Less than 12 months, Fair value | 97,120 | 134,909
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 1,247 | 5,148
Securities Held-to-Maturity, 12 months or longer, Fair value | 12,983 |
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 376 |
Securities Held-to-Maturity, Fair value, Total | 110,103 | 134,909
Securities Held-to-Maturity, Unrealized losses, Total | $ 1,623 | $ 5,148

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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