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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 1,503,572 | $ 1,479,545
Gross Unrealized Gains | 1,585 | 2,870
Gross Unrealized Losses | 157,500 | 144,278
Estimated Fair Value | 1,347,657 | 1,338,137
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 227,434 | 228,456
Gross Unrealized Gains | 217 | 371
Gross Unrealized Losses | 17,127 | 16,089
Estimated Fair Value | 210,524 | 212,738
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 1,236,587 | 1,211,484
Gross Unrealized Gains | 1,316 | 2,362
Gross Unrealized Losses | 138,106 | 125,753
Estimated Fair Value | 1,099,797 | 1,088,093
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 6,981 | 6,997
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 284 | 293
Estimated Fair Value | 6,697 | 6,704
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 4,600 | 4,599
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 151 | 321
Estimated Fair Value | 4,449 | 4,278
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 27,970 | 28,009
Gross Unrealized Gains | 52 | 137
Gross Unrealized Losses | 1,832 | 1,822
Estimated Fair Value | $ 26,190 | $ 26,324

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