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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,035,743 | $ 1,187,499
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 52,548 | 28,425
Securities Available-for-Sale, Gross Unrealized Holding Losses | 70 | 6,223
Debt Securities, Available-for-sale | 1,088,221 | 1,209,701
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 280,371 | 302,928
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 23,396 | 17,563
Debt Securities, Available-for-sale | 303,767 | 320,491
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 755,372 | 884,571
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 29,152 | 10,862
Securities Available-for-Sale, Gross Unrealized Holding Losses | 70 | 6,223
Debt Securities, Available-for-sale | $ 784,454 | $ 889,210

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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=121645371&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=121645371&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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