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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in benefit obligation      
Benefit obligation at beginning of year $ 38,150 $ 36,840 $ 36,164
Service cost
Interest cost 1,312 1,449 1,502
Actuarial (gain) loss (1,160) 1,941 1,288
Benefits paid (1,948) (2,080) (2,114)
Benefit obligation at end of year 36,354 38,150 36,840
Change in plan assets      
Plan assets at beginning of year 41,306 36,950 35,489
Actual return on plan assets (188) 6,436 3,575
Employer contributions
Benefits paid (1,948) (2,080) (2,114)
Plan assets at end of year 39,170 41,306 36,950
Funded status at end of year $ 2,816 $ 3,156 $ 110