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Employee Benefit Plans (Summary Of Pension Plans Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at prior valuation date $ 120,602 $ 112,063  
Service cost 410 607 $ 651
Interest cost 3,282 4,198 3,756
Defined Benefit Plan, Benefit Obligation, Benefits Paid (6,765) (7,016)  
Actuarial (gain) loss 9,634 10,750  
Projected benefit obligation at valuation date 127,163 120,602 112,063
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at prior valuation date 107,556 99,418  
Actual return on plan assets 8,744 15,129  
Employer contributions 80 25  
Benefits paid (6,765) (7,016)  
Fair value of plan assets at valuation date 109,615 107,556 $ 99,418
Funded status and net amount recognized at valuation date $ (17,548) $ (13,046)