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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 1,583,311 | $ 1,602,721
Gross Unrealized Gains | 3,503 | 8,546
Gross Unrealized Losses | 110,089 | 107,909
Estimated Fair Value | 1,476,725 | 1,503,358
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 185,915 | 189,276
Gross Unrealized Gains | 905 | 538
Gross Unrealized Losses | 9,486 | 10,090
Estimated Fair Value | 177,334 | 179,724
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 1,371,095 | 1,387,057
Gross Unrealized Gains | 2,395 | 7,836
Gross Unrealized Losses | 99,894 | 97,104
Estimated Fair Value | 1,273,596 | 1,297,789
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 5,055 | 5,068
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 72 | 36
Estimated Fair Value | 4,983 | 5,032
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 4,616 | 4,612
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 78 | 188
Estimated Fair Value | 4,538 | 4,424
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 16,630 | 16,708
Gross Unrealized Gains | 203 | 172
Gross Unrealized Losses | 559 | 491
Estimated Fair Value | $ 16,274 | $ 16,389

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