Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
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	0	139
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	12,361	(55,763)
Other comprehensive loss before reclassifications	12,361	(55,624)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	0	139
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	12,361	(55,763)
Other comprehensive income (loss)	12,361	(55,624)
Changes in pension plan assets and benefit obligations, Net-of-tax amount	(6,680)	(5,792)	$ 6,680	$ 5,792
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	0	(67)	0	(206)
Unrealized gains on available-for-sale securities, Net-of-tax amount	(83,353)	(34,610)	(95,714)	21,153
Total accumulated other comprehensive income (loss), Net-of-tax amount	$ (90,033)	$ (40,469)	$ (102,394)	$ 15,155