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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | $ 547,752 | $ 261,855
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 12,583 | 2,856
Securities Available-for-Sale, 12 months or longer, Fair value | 450,284 | 536,586
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 29,986 | 7,553
Securities Available-for-Sale, Fair value, Total | 998,036 | 798,441
Securities Available-for-Sale, Unrealized losses, Total | 42,569 | 10,409
Securities Held-to-Maturity, Less than 12 months, Fair value | 184,778 | 33,975
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 4,206 | 232
Securities Held-to-Maturity, 12 months or longer, Fair value | 76,373 | 45,498
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 3,232 | 519
Securities Held-to-Maturity, Fair value, Total | 261,151 | 79,473
Securities Held-to-Maturity, Unrealized losses, Total | 7,438 | 751
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 |  | 24,931
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  | 70
Securities Available-for-Sale, 12 months or longer, Fair value |  | 217,789
Securities Available-for-Sale, 12 months or longer, Unrealized losses |  | 2,210
Securities Available-for-Sale, Fair value, Total |  | 242,720
Securities Available-for-Sale, Unrealized losses, Total |  | 2,280
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 547,752 | 236,924
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 12,583 | 2,786
Securities Available-for-Sale, 12 months or longer, Fair value | 450,284 | 318,797
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 29,986 | 5,343
Securities Available-for-Sale, Fair value, Total | 998,036 | 555,721
Securities Available-for-Sale, Unrealized losses, Total | 42,569 | 8,129
Securities Held-to-Maturity, Less than 12 months, Fair value | 32,704 | 7,331
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 1,165 | 38
Securities Held-to-Maturity, 12 months or longer, Fair value | 6,944 |
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 221 |
Securities Held-to-Maturity, Fair value, Total | 39,648 | 7,331
Securities Held-to-Maturity, Unrealized losses, Total | 1,386 | 38
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Less than 12 months, Fair value | 152,074 | 26,644
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 3,041 | 194
Securities Held-to-Maturity, 12 months or longer, Fair value | 69,429 | 45,498
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 3,011 | 519
Securities Held-to-Maturity, Fair value, Total | 221,503 | 72,142
Securities Held-to-Maturity, Unrealized losses, Total | $ 6,052 | $ 713

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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