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Employee Benefit Plans (Components Of Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Employee Benefit Plans [Abstract]    
Service cost $ 785 $ 721
Interest cost on projected benefit obligation 613 601
Expected return on plan assets (1,194) (1,150)
Amortization of unrecognized prior service credit (13) (12)
Amortization of unrecognized net actuarial loss 292 239
Net periodic benefit expense $ 483 $ 399