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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,800,956 | $ 1,727,363
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7,882 | 36,291
Securities Available-for-Sale, Gross Unrealized Holding Losses | 51,691 | 9,514
Debt Securities, Available-for-sale | 1,757,147 | 1,754,140
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 374,101 | 366,933
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6,572 | 22,682
Securities Available-for-Sale, Gross Unrealized Holding Losses | 9,032 | 24
Debt Securities, Available-for-sale | 371,641 | 389,591
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 870,576 | 849,114
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,185 | 13,437
Securities Available-for-Sale, Gross Unrealized Holding Losses | 36,959 | 8,088
Debt Securities, Available-for-sale | 834,802 | 854,463
Corporate Debt Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 17,250 | 11,250
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 125 | 169
Securities Available-for-Sale, Gross Unrealized Holding Losses | 150 | 7
Debt Securities, Available-for-sale | 17,225 | 11,412
Collateralized Loan Obligations |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 500,029 | 500,066
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 3
Securities Available-for-Sale, Gross Unrealized Holding Losses | 5,112 | 1,395
Debt Securities, Available-for-sale | 494,917 | $ 498,674
US Government Corporations and Agencies Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 39,000 |
Securities Available-for-Sale, Gross Unrealized Holding Losses | 438 |
Debt Securities, Available-for-sale | $ 38,562 |

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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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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