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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | $ 1,282,022 | $ 1,299,980
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 15,539 | 15,010
Securities Available-for-Sale, Gross Unrealized Holding Losses | 4,097 | 13,075
Securities Available-for-Sale, Total Fair value | 1,293,464 | 1,301,915
Securities Held-to-Maturity, Amortized Cost | 117,509 | 140,562
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 2,158 |
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 82 |
Securities Held-to-Maturity, Estimated Fair Value | 119,585 | 143,490
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 546,888 | 546,886
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 260 | 11
Securities Available-for-Sale, Gross Unrealized Holding Losses | 2,097 | 8,833
Securities Available-for-Sale, Total Fair value | 545,051 | 538,064
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 734,014 | 751,974
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 13,766 | 13,421
Securities Available-for-Sale, Gross Unrealized Holding Losses | 2,000 | 4,242
Securities Available-for-Sale, Total Fair value | 745,780 | 761,153
Securities Held-to-Maturity, Amortized Cost | 111,415 | 140,562
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 2,110 | 3,088
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 82 | 160
Securities Held-to-Maturity, Estimated Fair Value | 113,443 | 143,490
Other Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 1,120 | 1,120
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1,513 | 1,578
Securities Available-for-Sale, Total Fair value | 2,633 | $ 2,698
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Amortized Cost | 6,094 |
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 48 |
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 0 |
Securities Held-to-Maturity, Estimated Fair Value | $ 6,142 |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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