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Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 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) $ (1,692) $ 16,754 $ (1,692)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 0 0    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 0      
Unrealized gains on available-for-sale securities, Net-of-tax amount (51,413) (68,087) (62,929) (67,883)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax 11,516 (518)    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax   314    
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax 11,516 (204)    
Total accumulated other comprehensive income (loss), Net-of-tax amount (34,659) (66,395) $ (46,175) $ (66,191)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 0 398    
Other comprehensive loss before reclassifications 11,516 (518)    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent   314    
Other comprehensive income (loss) $ 11,516 $ (204)