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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Changes in pension plan assets and benefit obligations, Net-of-tax amount $ (16,754) $ (14,839) $ (16,754) $ (14,839) $ 16,754 $ 16,754 $ 1,692 $ (1,692)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 0 17,687 0 17,687        
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 0 13,147 0 13,147        
Unrealized gains on available-for-sale securities, Net-of-tax amount (42,450) (49,523) (42,450) (49,523) (48,261) (62,929) (70,146) (67,883)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax 5,811 20,623 20,479 18,046        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax   0   314        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax 5,811 20,623 20,479 18,360        
Total accumulated other comprehensive income (loss), Net-of-tax amount (25,696) (34,684) (25,696) (34,684) $ (31,507) $ (46,175) $ (68,454) $ (66,191)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 0 0 0 (398)        
Other comprehensive loss before reclassifications 5,811 38,310 20,479 35,733        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   4,540            
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax 0 (4,540) 0 (4,540)        
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent       (4,226)        
Other comprehensive income (loss) 5,811 33,770 20,479 31,507        
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax 0 0 0 398        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0 0 0 84        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 0 37 0 37        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 0 (5,783) 0 (5,783)        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax 0 (5,746) 0 (5,746)        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax 0 (1,206) 0 (1,206)        
Available-for-Sale Securities                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ 0 $ 0 $ 0 $ 314