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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Less Than Twelve Months |  |
Estimated Fair Value | $ 5,977 | $ 9,637
Unrealized Loss | 45 | 10,337
Estimated Fair Value | 978,774 | 955,196
Twelve Months or Greater |  |
Unrealized Loss | 116,043 | 133,941
Estimated Fair Value | 984,751 | 964,833
Unrealized Loss | 116,088 | 144,278
Obligations of states and political subdivisions |  |
Less Than Twelve Months |  |
Estimated Fair Value | 4,683 | 7,591
Unrealized Loss | 33 | 66
Estimated Fair Value | 178,275 | 180,560
Twelve Months or Greater |  |
Unrealized Loss | 13,772 | 16,023
Estimated Fair Value | 182,958 | 188,151
Unrealized Loss | 13,805 | 16,089
U.S. Government agencies |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 2,046
Unrealized Loss | 0 | 10,271
Estimated Fair Value | 766,660 | 740,914
Twelve Months or Greater |  |
Unrealized Loss | 101,113 | 115,482
Estimated Fair Value | 766,660 | 742,960
Unrealized Loss | 101,113 | 125,753
Private label |  |
Less Than Twelve Months |  |
Estimated Fair Value | 1,294 | 0
Unrealized Loss | 12 | 0
Estimated Fair Value | 5,002 | 4,835
Twelve Months or Greater |  |
Unrealized Loss | 97 | 293
Estimated Fair Value | 6,296 | 4,835
Unrealized Loss | 109 | 293
Trust preferred securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 4,515 | 4,278
Twelve Months or Greater |  |
Unrealized Loss | 89 | 321
Estimated Fair Value | 4,515 | 4,278
Unrealized Loss | 89 | 321
Corporate securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 24,322 | 24,609
Twelve Months or Greater |  |
Unrealized Loss | 972 | 1,822
Estimated Fair Value | 24,322 | 24,609
Unrealized Loss | $ 972 | $ 1,822

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