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Employee Benefit Plans (Schedule of Reconciliation of Benefit Obligation) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in benefit obligation      
Benefit obligation at beginning of year $ 36,840 $ 36,164 $ 35,615
Service cost
Interest cost 1,449 1,502 1,364
Actuarial (gain) loss 1,941 1,288 1,236
Benefits paid (2,080) (2,114) (2,051)
Benefit obligation at end of year 38,150 36,840 36,164
Change in plan assets      
Plan assets at beginning of year 36,950 35,489 37,282
Actual return on plan assets 6,436 3,575 258
Employer contributions
Benefits paid (2,080) (2,114) (2,051)
Plan assets at end of year 41,306 36,950 35,489
Funded status at end of year $ 3,156 $ 110 $ (675)