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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 9,637 | $ 766,882
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10,337 | 75,309
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 955,196 | 394,860
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 133,941 | 93,680
Debt Securities, Available-for-sale, Unrealized Loss Position | 964,833 | 1,161,742
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 144,278 | 168,989
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Obligations of states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 7,591 | 203,173
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 66 | 21,929
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 180,560 | 13,359
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 16,023 | 2,395
Debt Securities, Available-for-sale, Unrealized Loss Position | 188,151 | 216,532
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 16,089 | 24,324
U.S. Government agencies |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,046 | 533,611
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10,271 | 50,268
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 741,011 | 376,778
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 115,482 | 90,418
Debt Securities, Available-for-sale, Unrealized Loss Position | 743,057 | 910,389
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 125,753 | 140,686
Private label |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 7,126
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 464
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,738 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 293 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 4,738 | 7,126
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 293 | 464
Trust preferred securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,278 | 3,828
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 321 | 762
Debt Securities, Available-for-sale, Unrealized Loss Position | 4,278 | 3,828
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 321 | 762
Corporate securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 22,972
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 2,648
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 24,609 | 895
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,822 | 105
Debt Securities, Available-for-sale, Unrealized Loss Position | 24,609 | 23,867
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,822 | $ 2,753

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