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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,519,098 | $ 1,007,834
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 39,632 | 52,235
Securities Available-for-Sale, Gross Unrealized Holding Losses | 5,512 | 728
Debt Securities, Available-for-sale | 1,553,218 | 1,059,341
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 277,527 | 279,245
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 21,567 | 25,973
Debt Securities, Available-for-sale | 299,094 | 305,218
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 844,128 | 726,589
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 17,876 | 26,248
Securities Available-for-Sale, Gross Unrealized Holding Losses | 4,855 | 728
Debt Securities, Available-for-sale | 857,149 | 752,109
Corporate Debt Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 9,250 | 2,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 43 | 14
Debt Securities, Available-for-sale | 9,293 | $ 2,014
Collateralized Loan Obligations |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 388,193 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 146 |
Securities Available-for-Sale, Gross Unrealized Holding Losses | 657 |
Debt Securities, Available-for-sale | $ 387,682 |

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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=123581744&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=123581744&loc=d3e27161-111563 + Details
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