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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | $ 1,354,661 | $ 1,436,714
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 19,729 | 10,366
Securities Available-for-Sale, Gross Unrealized Holding Losses | 2,207 | 10,814
Securities Available-for-Sale, Total Fair value | 1,372,183 | 1,436,266
Securities Held-to-Maturity, Amortized Cost | 171,273 | 149,302
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 3,334 | 2,260
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 79 | 134
Securities Held-to-Maturity, Estimated Fair Value | 174,528 | 151,428
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 421,897 | 527,605
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 201 |
Securities Available-for-Sale, Gross Unrealized Holding Losses | 888 | 5,542
Securities Available-for-Sale, Total Fair value | 421,210 | 522,063
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 931,644 | 907,989
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 18,026 | 8,776
Securities Available-for-Sale, Gross Unrealized Holding Losses | 1,319 | 5,272
Securities Available-for-Sale, Total Fair value | 948,351 | 911,493
Securities Held-to-Maturity, Amortized Cost | 96,129 | 101,112
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 1,896 | 1,526
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 68 | 134
Securities Held-to-Maturity, Estimated Fair Value | 97,957 | 102,504
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 | 1,502 | 1,590
Securities Available-for-Sale, Total Fair value | 2,622 | 2,710
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Amortized Cost | 75,144 | 48,190
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 1,438 | 734
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 11 |
Securities Held-to-Maturity, Estimated Fair Value | $ 76,571 | $ 48,924

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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=73527792&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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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