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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 3,951,562 | $ 1,486,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 29,774 | 143,817
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,828,968 | 1,660,143
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 525,636 | 398,532
Debt Securities, Available-for-sale, Unrealized Loss Position | 6,780,530 | 3,146,726
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 555,410 | 542,349
U.S. Treasury and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 546,511 | 734,473
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,036 | 71,967
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 837,124 | 201,701
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 95,117 | 27,391
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,383,635 | 936,174
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 98,153 | 99,358
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 249,310 | 160,078
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,465 | 10,037
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 136,483 | 60,381
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 23,579 | 18,004
Debt Securities, Available-for-sale, Unrealized Loss Position | 385,793 | 220,459
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 26,044 | 28,041
Mortgage-backed securities and collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,155,741 | 592,032
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 24,273 | 61,813
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,855,361 | 1,398,061
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 406,940 | 353,137
Debt Securities, Available-for-sale, Unrealized Loss Position | 5,011,102 | 1,990,093
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 431,213 | $ 414,950

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