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Employee Benefit Plans (Summary Of Status Of Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Actual contributions during the year $ 3,821 $ 6,825 $ 4,750
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 404,471 355,356  
Service cost 10,637 9,522 8,255
Interest cost 8,253 10,112 11,712
Actuarial (gain)/loss (8,587) 43,595  
Benefits paid (12,147) (14,115)  
Projected benefit obligation at end of year 402,626 404,471 355,356
Fair value of plan assets at beginning of year 354,464 301,467  
Actual return on plan assets 31,166 60,286  
Actual contributions during the year 3,821 6,825  
Administrative expenses paid  
Benefits paid (12,147) (14,115)  
Fair value of plan assets at end of year 377,303 354,464 301,467
Funded status at end of year (25,323) (50,007)  
Post-Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 35,098 29,376  
Service cost 1,096 1,066 983
Interest cost 641 845 980
Amendments  
Actuarial (gain)/loss (6,044) 4,042  
Benefits paid (267) (232)  
Projected benefit obligation at end of year 30,523 35,098 29,376
Fair value of plan assets at beginning of year  
Actual contributions during the year 267 232  
Benefits paid (267) (232)  
Fair value of plan assets at end of year
Funded status at end of year $ (30,523) $ (35,098)