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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Less Than Twelve Months |  |
Estimated Fair Value | $ 16,713 | $ 9,637
Unrealized Loss | 8,768 | 10,337
Estimated Fair Value | 939,870 | 955,196
Twelve Months or Greater |  |
Unrealized Loss | 148,732 | 133,941
Estimated Fair Value | 956,583 | 964,833
Unrealized Loss | 157,500 | 144,278
Obligations of states and political subdivisions |  |
Less Than Twelve Months |  |
Estimated Fair Value | 14,599 | 7,591
Unrealized Loss | 200 | 66
Estimated Fair Value | 181,421 | 180,560
Twelve Months or Greater |  |
Unrealized Loss | 16,927 | 16,023
Estimated Fair Value | 196,020 | 188,151
Unrealized Loss | 17,127 | 16,089
U.S. Government agencies |  |
Less Than Twelve Months |  |
Estimated Fair Value | 265 | 2,046
Unrealized Loss | 8,546 | 10,271
Estimated Fair Value | 724,601 | 740,911
Twelve Months or Greater |  |
Unrealized Loss | 129,560 | 115,482
Estimated Fair Value | 724,866 | 742,957
Unrealized Loss | 138,106 | 125,753
Private label |  |
Less Than Twelve Months |  |
Estimated Fair Value | 1,849 | 0
Unrealized Loss | 22 | 0
Estimated Fair Value | 4,848 | 4,838
Twelve Months or Greater |  |
Unrealized Loss | 262 | 293
Estimated Fair Value | 6,697 | 4,838
Unrealized Loss | 284 | 293
Trust preferred securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 4,449 | 4,278
Twelve Months or Greater |  |
Unrealized Loss | 151 | 321
Estimated Fair Value | 4,449 | 4,278
Unrealized Loss | 151 | 321
Corporate securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 24,551 | 24,609
Twelve Months or Greater |  |
Unrealized Loss | 1,832 | 1,822
Estimated Fair Value | 24,551 | 24,609
Unrealized Loss | $ 1,832 | $ 1,822

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