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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 653,779 | $ 73,478
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7,084 | 245
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 29,918 | 4,135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 437 | 457
Debt Securities, Available-for-sale, Unrealized Loss Position | 683,697 | 77,613
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 7,521 | 702
Obligations of states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 13,277 | 10,578
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 152 | 139
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,420 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 63 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 15,697 | 10,578
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 215 | 139
U.S. Government agencies |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 639,514 | 62,412
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,920 | 105
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 23,295 | 35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 662,809 | 62,447
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,927 | 105
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, Held-to-maturity, 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 | 4,203 | 4,100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 367 | 457
Debt Securities, Available-for-sale, Unrealized Loss Position | 4,203 | 4,100
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 367 | 457
Corporate securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 988 | 488
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 12 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 988 | 488
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 12 | $ 1

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