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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Less Than Twelve Months |  |
Estimated Fair Value | $ 160,056 | $ 766,882
Unrealized Loss | 18,722 | 75,309
Estimated Fair Value | 940,646 | 394,860
Twelve Months or Greater |  |
Unrealized Loss | 148,589 | 93,680
Estimated Fair Value | 1,100,702 | 1,161,742
Unrealized Loss | 167,311 | 168,989
Obligations of states and political subdivisions |  |
Less Than Twelve Months |  |
Estimated Fair Value | 43,264 | 203,173
Unrealized Loss | 1,102 | 21,929
Estimated Fair Value | 169,087 | 13,359
Twelve Months or Greater |  |
Unrealized Loss | 19,379 | 2,395
Estimated Fair Value | 212,351 | 216,532
Unrealized Loss | 20,481 | 24,324
U.S. Government agencies |  |
Less Than Twelve Months |  |
Estimated Fair Value | 105,588 | 533,611
Unrealized Loss | 16,261 | 50,268
Estimated Fair Value | 746,989 | 376,778
Twelve Months or Greater |  |
Unrealized Loss | 126,475 | 90,418
Estimated Fair Value | 852,577 | 910,389
Unrealized Loss | 142,736 | 140,686
Trust preferred securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 4,192 | 3,828
Twelve Months or Greater |  |
Unrealized Loss | 403 | 762
Estimated Fair Value | 4,192 | 3,828
Unrealized Loss | 403 | 762
Corporate securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 11,204 | 22,972
Unrealized Loss | 1,359 | 2,648
Estimated Fair Value | 13,688 | 895
Twelve Months or Greater |  |
Unrealized Loss | 1,834 | 105
Estimated Fair Value | 24,892 | 23,867
Unrealized Loss | 3,193 | 2,753
Private label |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 7,126
Unrealized Loss | 0 | 464
Estimated Fair Value | 6,690 | 0
Twelve Months or Greater |  |
Unrealized Loss | 498 | 0
Estimated Fair Value | 6,690 | 7,126
Unrealized Loss | $ 498 | $ 464

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