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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Less Than Twelve Months |  |
Estimated Fair Value | $ 575,961 | $ 73,478
Unrealized Loss | 5,799 | 245
Estimated Fair Value | 30,155 | 4,135
Twelve Months or Greater |  |
Unrealized Loss | 199 | 457
Estimated Fair Value | 606,116 | 77,613
Unrealized Loss | 5,998 | 702
Obligations of states and political subdivisions |  |
Less Than Twelve Months |  |
Estimated Fair Value | 58,991 | 10,578
Unrealized Loss | 516 | 139
Estimated Fair Value | 2,410 | 0
Twelve Months or Greater |  |
Unrealized Loss | 73 | 0
Estimated Fair Value | 61,401 | 10,578
Unrealized Loss | 589 | 139
U.S. Government agencies |  |
Less Than Twelve Months |  |
Estimated Fair Value | 515,972 | 62,412
Unrealized Loss | 5,281 | 105
Estimated Fair Value | 23,296 | 35
Twelve Months or Greater |  |
Unrealized Loss | 8 | 0
Estimated Fair Value | 539,268 | 62,447
Unrealized Loss | 5,289 | 105
Trust preferred securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 4,449 | 4,100
Twelve Months or Greater |  |
Unrealized Loss | 118 | 457
Estimated Fair Value | 4,449 | 4,100
Unrealized Loss | 118 | 457
Corporate securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 998 | 488
Unrealized Loss | 2 | 1
Estimated Fair Value | 0 | 0
Twelve Months or Greater |  |
Unrealized Loss | 0 | 0
Estimated Fair Value | 998 | 488
Unrealized Loss | $ 2 | $ 1

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