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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | $ 318,030 | $ 711,142
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 919 | 4,893
Securities Available-for-Sale, 12 months or longer, Fair value | 28,993 | 309,633
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 65 | 5,921
Securities Available-for-Sale, Fair value, Total | 347,023 | 1,020,775
Securities Available-for-Sale, Unrealized losses, Total | 984 | 10,814
Securities Held-to-Maturity, Less than 12 months, Fair value | 13,259 |
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 200 |
Securities Held-to-Maturity, 12 months or longer, Fair value | 7,700 |
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 19 |
Securities Held-to-Maturity, Fair value, Total | 20,959 |
Securities Held-to-Maturity, Unrealized losses, Total | 219 | 134
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 | 269,145 | 326,973
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 855 | 2,117
Securities Available-for-Sale, 12 months or longer, Fair value |  | 195,090
Securities Available-for-Sale, 12 months or longer, Unrealized losses |  | 3,425
Securities Available-for-Sale, Fair value, Total | 269,145 | 522,063
Securities Available-for-Sale, Unrealized losses, Total | 855 | 5,542
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 48,885 | 384,169
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 64 | 2,776
Securities Available-for-Sale, 12 months or longer, Fair value | 28,993 | 114,543
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 65 | 2,496
Securities Available-for-Sale, Fair value, Total | 77,878 | 498,712
Securities Available-for-Sale, Unrealized losses, Total | 129 | 5,272
Securities Held-to-Maturity, Less than 12 months, Fair value |  | 5,656
Securities Held-to-Maturity, Less than 12 months, Unrealized losses |  | 10
Securities Held-to-Maturity, 12 months or longer, Fair value | 7,700 | 7,792
Securities Held-to-Maturity, 12 months or longer, Unrealized losses | 19 | 124
Securities Held-to-Maturity, Fair value, Total | 7,700 | 13,448
Securities Held-to-Maturity, Unrealized losses, Total | 19 | $ 134
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Less than 12 months, Fair value | 13,259 |
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 200 |
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 | 13,259 |
Securities Held-to-Maturity, Unrealized losses, Total | $ 200 |

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