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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 313,726 | $ 1,486,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7,021 | 143,817
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,811,915 | 1,660,143
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 483,755 | 398,532
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,125,641 | 3,146,726
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 490,776 | 542,349
U.S. Treasury and agencies |  |
Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 78,917 | 734,473
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,513 | 71,967
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 770,126 | 201,701
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 82,545 | 27,391
Debt Securities, Available-for-sale, Unrealized Loss Position | 849,043 | 936,174
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 86,058 | 99,358
Obligations of states and political subdivisions |  |
Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 59,926 | 160,078
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 425 | 10,037
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 129,513 | 60,381
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 21,699 | 18,004
Debt Securities, Available-for-sale, Unrealized Loss Position | 189,439 | 220,459
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 22,124 | 28,041
Mortgage-backed securities and collateralized mortgage obligations |  |
Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 174,883 | 592,032
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,083 | 61,813
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,912,276 | 1,398,061
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 379,511 | 353,137
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,087,159 | 1,990,093
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 382,594 | $ 414,950

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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