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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Less Than Twelve Months |  |
Estimated Fair Value | $ 378,262 | $ 766,882
Unrealized Loss | 26,574 | 75,309
Estimated Fair Value | 755,157 | 394,860
Twelve Months or Greater |  |
Unrealized Loss | 122,906 | 93,680
Estimated Fair Value | 1,133,419 | 1,161,742
Unrealized Loss | 149,480 | 168,989
Obligations of states and political subdivisions |  |
Less Than Twelve Months |  |
Estimated Fair Value | 42,850 | 203,173
Unrealized Loss | 1,084 | 21,929
Estimated Fair Value | 155,074 | 13,359
Twelve Months or Greater |  |
Unrealized Loss | 18,118 | 2,395
Estimated Fair Value | 197,924 | 216,532
Unrealized Loss | 19,202 | 24,324
U.S. Government agencies |  |
Less Than Twelve Months |  |
Estimated Fair Value | 318,110 | 533,611
Unrealized Loss | 24,334 | 50,268
Estimated Fair Value | 582,062 | 376,778
Twelve Months or Greater |  |
Unrealized Loss | 102,650 | 90,418
Estimated Fair Value | 900,172 | 910,389
Unrealized Loss | 126,984 | 140,686
Trust preferred securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 4,125 | 3,828
Twelve Months or Greater |  |
Unrealized Loss | 467 | 762
Estimated Fair Value | 4,125 | 3,828
Unrealized Loss | 467 | 762
Corporate securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 10,251 | 22,972
Unrealized Loss | 755 | 2,648
Estimated Fair Value | 13,896 | 895
Twelve Months or Greater |  |
Unrealized Loss | 1,671 | 105
Estimated Fair Value | 24,147 | 23,867
Unrealized Loss | 2,426 | 2,753
Private label |  |
Less Than Twelve Months |  |
Estimated Fair Value | 7,051 | 7,126
Unrealized Loss | 401 | 464
Estimated Fair Value | 0 | 0
Twelve Months or Greater |  |
Unrealized Loss | 0 | 0
Estimated Fair Value | 7,051 | 7,126
Unrealized Loss | $ 401 | $ 464

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