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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | $ 662,276 | $ 261,855
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 17,518 | 2,856
Securities Available-for-Sale, 12 months or longer, Fair value | 294,713 | 536,586
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 16,197 | 7,553
Securities Available-for-Sale, Fair value, Total | 956,989 | 798,441
Securities Available-for-Sale, Unrealized losses, Total | 33,715 | 10,409
Securities Held-to-Maturity, Less than 12 months, Fair value | 160,664 | 33,975
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 2,780 | 232
Securities Held-to-Maturity, 12 months or longer, Fair value | 49,748 | 45,498
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 1,752 | 519
Securities Held-to-Maturity, Fair value, Total | 210,412 | 79,473
Securities Held-to-Maturity, Unrealized losses, Total | 4,532 | 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 | 662,276 | 236,924
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 17,518 | 2,786
Securities Available-for-Sale, 12 months or longer, Fair value | 294,713 | 318,797
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 16,197 | 5,343
Securities Available-for-Sale, Fair value, Total | 956,989 | 555,721
Securities Available-for-Sale, Unrealized losses, Total | 33,715 | 8,129
Securities Held-to-Maturity, Less than 12 months, Fair value | 45,521 | 7,331
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 1,246 | 38
Securities Held-to-Maturity, 12 months or longer, Fair value | 0 |
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 0 |
Securities Held-to-Maturity, Fair value, Total | 45,521 | 7,331
Securities Held-to-Maturity, Unrealized losses, Total | 1,246 | 38
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Less than 12 months, Fair value | 115,143 | 26,644
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 1,534 | 194
Securities Held-to-Maturity, 12 months or longer, Fair value | 49,748 | 45,498
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 1,752 | 519
Securities Held-to-Maturity, Fair value, Total | 164,891 | 72,142
Securities Held-to-Maturity, Unrealized losses, Total | $ 3,286 | $ 713

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