Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	$ 0	$ 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	139	125
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	(55,763)	(13,597)
Other comprehensive loss before reclassifications	(55,624)	(13,472)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	139	125
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	(55,763)	(13,597)
Other comprehensive income (loss)	(55,624)	(13,472)
Changes in pension plan assets and benefit obligations, Net-of-tax amount	(5,792)	(34,421)	$ 5,792	$ 34,421
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	(67)	(573)	(206)	(698)
Unrealized gains on available-for-sale securities, Net-of-tax amount	(34,610)	27,093	21,153	40,690
Total accumulated other comprehensive income (loss), Net-of-tax amount	$ (40,469)	$ (7,901)	$ 15,155	$ 5,571