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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | $ 251,414 | $ 506,280
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 1,095 | 5,998
Securities Available-for-Sale, 12 months or longer, Fair value | 181,807 | 449,569
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 5,365 | 19,917
Securities Available-for-Sale, Fair value, Total | 433,221 | 955,849
Securities Available-for-Sale, Unrealized losses, Total | 6,460 | 25,915
Securities Held-to-Maturity, Less than 12 months, Fair value |  | 124,616
Securities Held-to-Maturity, Less than 12 months, Unrealized losses |  | 1,933
Securities Held-to-Maturity, 12 months or longer, Fair value |  | 77,654
Securities Held-to-Maturity, 12 months or longer, Unrealized losses |  | 1,742
Securities Held-to-Maturity, Fair value, Total |  | 202,270
Securities Held-to-Maturity, Unrealized losses, Total |  | 3,675
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 251,414 | 506,280
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 1,095 | 5,998
Securities Available-for-Sale, 12 months or longer, Fair value | 181,807 | 449,569
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 5,365 | 19,917
Securities Available-for-Sale, Fair value, Total | 433,221 | 955,849
Securities Available-for-Sale, Unrealized losses, Total | $ 6,460 | 25,915
Securities Held-to-Maturity, Less than 12 months, Fair value |  | 32,656
Securities Held-to-Maturity, Less than 12 months, Unrealized losses |  | 838
Securities Held-to-Maturity, 12 months or longer, Fair value |  | 6,931
Securities Held-to-Maturity, 12 months or longer, Unrealized losses |  | 165
Securities Held-to-Maturity, Fair value, Total |  | 39,587
Securities Held-to-Maturity, Unrealized losses, Total |  | 1,003
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Less than 12 months, Fair value |  | 91,960
Securities Held-to-Maturity, Less than 12 months, Unrealized losses |  | 1,095
Securities Held-to-Maturity, 12 months or longer, Fair value |  | 70,723
Securities Held-to-Maturity, 12 months or longer, Unrealized losses |  | 1,577
Securities Held-to-Maturity, Fair value, Total |  | 162,683
Securities Held-to-Maturity, Unrealized losses, Total |  | $ 2,672

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