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Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Changes in pension plan assets and benefit obligations, Net-of-tax amount $ (14,839) $ 6,680 $ (14,839) $ 6,680 $ 1,692 $ 1,692 $ 6,680 $ 6,680
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 17,687 0 17,687 0        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax [Abstract] (4,540) 0 (4,540) 0        
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 13,147   13,147          
Unrealized gains on available-for-sale securities, Net-of-tax amount (49,523) (109,210) (49,523) (109,210) (70,146) (67,883) (90,106) (95,714)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax 20,623 (19,104) 18,046 (13,496)        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 0 0 314 0        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax 20,623 (19,104) 18,360 (13,496)        
Total accumulated other comprehensive income (loss), Net-of-tax amount (34,684) (115,890) (34,684) (115,890) $ (68,454) $ (66,191) $ (96,786) $ (102,394)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 0 0 398 0        
Other comprehensive loss before reclassifications 38,310 (19,104) 35,733 (13,496)        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (4,540)   (4,226)          
Other comprehensive income (loss) 33,770 (19,104) 31,507 (13,496)        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0 0 84 0        
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 37 0 37 0        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment (5,783) 0 (5,783) 0        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (5,746) 0 (5,746) 0        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax $ (1,206) $ 0 $ (1,206) $ 0