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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Less Than Twelve Months |  |
Estimated Fair Value | $ 72,624 | $ 766,882
Unrealized Loss | 17,075 | 75,309
Estimated Fair Value | 1,002,434 | 394,860
Twelve Months or Greater |  |
Unrealized Loss | 197,408 | 93,680
Estimated Fair Value | 1,075,058 | 1,161,742
Unrealized Loss | 214,483 | 168,989
Obligations of states and political subdivisions |  |
Less Than Twelve Months |  |
Estimated Fair Value | 25,076 | 203,173
Unrealized Loss | 1,132 | 21,929
Estimated Fair Value | 171,897 | 13,359
Twelve Months or Greater |  |
Unrealized Loss | 28,693 | 2,395
Estimated Fair Value | 196,973 | 216,532
Unrealized Loss | 29,825 | 24,324
U.S. Government agencies |  |
Less Than Twelve Months |  |
Estimated Fair Value | 46,028 | 533,611
Unrealized Loss | 15,895 | 50,268
Estimated Fair Value | 795,988 | 376,778
Twelve Months or Greater |  |
Unrealized Loss | 165,252 | 90,418
Estimated Fair Value | 842,016 | 910,389
Unrealized Loss | 181,147 | 140,686
Private label |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 7,126
Unrealized Loss | 0 | 464
Estimated Fair Value | 6,446 | 0
Twelve Months or Greater |  |
Unrealized Loss | 490 | 0
Estimated Fair Value | 6,446 | 7,126
Unrealized Loss | 490 | 464
Trust preferred securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 4,307 | 3,828
Twelve Months or Greater |  |
Unrealized Loss | 290 | 762
Estimated Fair Value | 4,307 | 3,828
Unrealized Loss | 290 | 762
Corporate securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 1,520 | 22,972
Unrealized Loss | 48 | 2,648
Estimated Fair Value | 23,796 | 895
Twelve Months or Greater |  |
Unrealized Loss | 2,683 | 105
Estimated Fair Value | 25,316 | 23,867
Unrealized Loss | $ 2,731 | $ 2,753

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