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Benefit Plan (Components Of Net Periodic Benefit Expense) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
Pension plan contributions $ 0 $ 0
Service cost 1,632,000 1,750,000
Interest cost 1,478,000 1,719,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (712,000) (454,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 1,632,000 1,750,000
Interest cost 1,478,000 1,719,000
Expected return on plan assets (3,834,000) (3,935,000)
Recognized net actuarial loss 12,000 12,000
Benefit expense (712,000) (454,000)
Supplemental Employee Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 194,000 216,000
Interest cost 182,000 155,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 376,000 371,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 194,000 216,000
Interest cost 182,000 155,000
Benefit expense $ 376,000 $ 371,000