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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 766,882 | $ 535,672
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 75,309 | 4,966
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 394,860 | 29,918
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 93,680 | 437
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,161,742 | 565,590
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 168,989 | 5,403
Obligations of states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 203,173 | 13,277
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 21,929 | 152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13,359 | 2,420
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,395 | 63
Debt Securities, Available-for-sale, Unrealized Loss Position | 216,532 | 15,697
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 24,324 | 215
U.S. Government agencies |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 533,611 | 521,407
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 50,268 | 4,802
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 376,778 | 23,295
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 90,418 | 7
Debt Securities, Available-for-sale, Unrealized Loss Position | 910,389 | 544,702
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 140,686 | 4,809
Private label |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 7,126 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 464 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,126 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 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 | 3,828 | 4,203
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 762 | 367
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,828 | 4,203
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 762 | 367
Corporate securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 22,972 | 988
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,648 | 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 895 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 105 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 23,867 | 988
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,753 | $ 12

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