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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 1,545,352 | $ 1,570,449
Gross Unrealized Gains | 4,142 | 2,417
Gross Unrealized Losses | 132,686 | 151,560
Estimated Fair Value | 1,416,808 | 1,421,306
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 197,752 | 199,131
Gross Unrealized Gains | 241 | 139
Gross Unrealized Losses | 15,569 | 15,519
Estimated Fair Value | 182,424 | 183,751
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 1,311,090 | 1,334,755
Gross Unrealized Gains | 3,710 | 1,993
Gross Unrealized Losses | 116,007 | 134,667
Estimated Fair Value | 1,198,793 | 1,202,081
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 5,081 | 5,096
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 134 | 163
Estimated Fair Value | 4,947 | 4,933
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 4,606 | 4,605
Gross Unrealized Gains | 58 | 141
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 4,664 | 4,746
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 26,823 | 26,862
Gross Unrealized Gains | 133 | 144
Gross Unrealized Losses | 976 | 1,211
Estimated Fair Value | $ 25,980 | $ 25,795

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