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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,074,605 | $ 1,097,645
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 229 | 4,645
Securities Available-for-Sale, Gross Unrealized Holding Losses | 42,569 | 10,409
Debt Securities, Available-for-sale | 1,032,265 | 1,091,881
Securities Held-to-Maturity, Amortized Cost | 350,642 | 357,197
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 1,137 | 7,333
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 7,438 | 751
Securities held-to-maturity, fair value | 344,341 | 363,779
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 245,000
Securities Available-for-Sale, Gross Unrealized Holding Losses |  | 2,280
Debt Securities, Available-for-sale |  | 242,720
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,074,605 | 852,645
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 229 | 4,645
Securities Available-for-Sale, Gross Unrealized Holding Losses | 42,569 | 8,129
Debt Securities, Available-for-sale | 1,032,265 | 849,161
Securities Held-to-Maturity, Amortized Cost | 46,974 | 56,785
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 41 | 758
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 1,386 | 38
Securities held-to-maturity, fair value | 45,629 | 57,505
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Amortized Cost | 303,668 | 300,412
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 1,096 | 6,575
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 6,052 | 713
Securities held-to-maturity, fair value | $ 298,712 | $ 306,274

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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