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Employee Benefit Plans (Summary Of Activity Within The Defined Benefit Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in fair value of plan assets:      
Fair value at beginning of measurement period $ 17,117 $ 17,435  
Actual gain (loss) on plan assets 1,890 669  
Contributions by employer 0 0  
Defined Benefit Plan, Plan Assets, Benefits Paid 2,647 987  
Fair value at End of measurement period 16,360 17,117 $ 17,435
Change in benefit obligation:      
Benefit obligation at beginning of measurement period (19,742) (19,700)  
Interest cost (772) (820) (813)
Actuarial loss (392) (263)  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change (614) 54  
Benefits paid (2,647) (987)  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement 385 0  
Benefit obligation at end of measurement period (18,488) (19,742) $ (19,700)
Funded status (2,128) (2,625)  
Other comprehensive loss $ (5,033) $ (4,660)  
Weighted-average assumptions for benefit cost at beginning of year, Discount rate 3.38% 4.01%  
Weighted-average assumptions for balance sheet liability at end of year, Expected long-term rate of return 6.56% 5.83%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.02% 4.26%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 5.83% 5.75%