Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Less Than Twelve Months
Estimated Fair Value	$ 273,203	$ 57,725
Unrealized Loss	1,927	357
Estimated Fair Value	905,877	952,624
Twelve Months or Greater
Unrealized Loss	108,162	107,552
Estimated Fair Value	1,179,080	1,010,349
Unrealized Loss	110,089	107,909
Obligations of states and political subdivisions
Less Than Twelve Months
Estimated Fair Value	5,612	4,746
Unrealized Loss	57	29
Estimated Fair Value	122,499	129,347
Twelve Months or Greater
Unrealized Loss	9,429	10,061
Estimated Fair Value	128,111	134,093
Unrealized Loss	9,486	10,090
U.S. Government agencies
Less Than Twelve Months
Estimated Fair Value	267,591	48,555
Unrealized Loss	1,870	140
Estimated Fair Value	759,466	803,686
Twelve Months or Greater
Unrealized Loss	98,024	96,964
Estimated Fair Value	1,027,057	852,241
Unrealized Loss	99,894	97,104
Private label
Less Than Twelve Months
Estimated Fair Value	0	0
Unrealized Loss	0	0
Estimated Fair Value	4,983	5,032
Twelve Months or Greater
Unrealized Loss	72	36
Estimated Fair Value	4,983	5,032
Unrealized Loss	72	36
Trust preferred securities
Less Than Twelve Months
Estimated Fair Value	0	4,424
Unrealized Loss	0	188
Estimated Fair Value	4,538	0
Twelve Months or Greater
Unrealized Loss	78	0
Estimated Fair Value	4,538	4,424
Unrealized Loss	78	188
Corporate securities
Less Than Twelve Months
Estimated Fair Value	0	0
Unrealized Loss	0	0
Estimated Fair Value	14,391	14,559
Twelve Months or Greater
Unrealized Loss	559	491
Estimated Fair Value	14,391	14,559
Unrealized Loss	$ 559	$ 491

Debt Securities, Available for Sale, 12 Months or Greater

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Debt Securities, Available for Sale, Less than 12 Months

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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