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Benefit Plan (Components Of Net Periodic Benefit Expense) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Pension plan contributions     $ 0 $ 0
Service cost $ 1,632,000 $ 1,750,000 4,896,000 5,250,000
Interest cost 1,478,000 1,719,000 4,434,000 5,157,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (712,000) (6,237,000) (2,136,000) (7,145,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 $ (5,783,000) 0 $ (5,783,000)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.17%   5.17%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1,632,000 $ 1,750,000 4,896,000 $ 5,250,000
Interest cost 1,478,000 1,719,000 4,434,000 5,157,000
Expected return on plan assets (3,834,000) (3,936,000) (11,502,000) (11,806,000)
Recognized net actuarial loss 12,000 13,000 36,000 37,000
Benefit expense (712,000) (6,237,000) (2,136,000) (7,145,000)
Supplemental Employee Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 195,000 216,000 583,000 1,201,000
Interest cost 183,000 154,000 547,000 464,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 378,000 370,000 1,130,000 1,665,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 195,000 216,000 583,000 1,201,000
Interest cost 183,000 154,000 547,000 464,000
Benefit expense $ 378,000 $ 370,000 $ 1,130,000 $ 1,665,000