Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	$ 0		$ 398	$ 0
Changes in pension plan assets and benefit obligations, Net-of-tax amount	1,692	$ (6,680)	1,692	(6,680)	$ 1,692	$ 1,692	$ (6,680)	$ (6,680)
Unrealized gains on available-for-sale securities, Net-of-tax amount	(70,146)	(90,106)	(70,146)	(90,106)	(68,087)	(67,883)	(83,353)	(95,714)
Total accumulated other comprehensive income (loss), Net-of-tax amount	(68,454)	(96,786)	(68,454)	(96,786)	$ (66,395)	$ (66,191)	$ (90,033)	$ (102,394)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	0	0	0	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	(2,059)	(6,753)	(2,577)	5,608
Other comprehensive loss before reclassifications	(2,059)	(6,753)	(2,577)	5,608
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	0	314	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			314
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	(2,059)	(6,753)	(2,263)	5,608
Other comprehensive income (loss)	$ (2,059)	$ (6,753)	$ (2,263)	$ 5,608