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Benefit Plan (Components Of Net Periodic Benefit Expense) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Pension plan contributions     $ 0 $ 0
Service cost $ 1,559,000 $ 2,437,000 3,118,000 4,874,000
Interest cost 1,631,000 1,426,000 3,262,000 2,852,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (334,000) (590,000) (668,000) (1,180,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1,559,000 2,437,000 3,118,000 4,874,000
Interest cost 1,631,000 1,426,000 3,262,000 2,852,000
Expected return on plan assets (3,536,000) (4,449,000) (7,072,000) (8,898,000)
Recognized net actuarial loss 12,000 (4,000) 24,000 (8,000)
Benefit expense (334,000) (590,000) (668,000) (1,180,000)
Supplemental Employee Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 234,000 212,000 468,000 425,000
Interest cost 175,000 183,000 351,000 366,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 409,000 395,000 819,000 791,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 234,000 212,000 468,000 425,000
Interest cost 175,000 183,000 351,000 366,000
Benefit expense $ 409,000 $ 395,000 $ 819,000 $ 791,000