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Employee Benefit Plans (Schedule of Net Pension Costs - SERP) (Details) - SERP [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Service cost - benefits earned during the period $ 118 $ 106 $ 201
Interest cost on projected benefit obligation 227 238 206
Net amortization and deferral (34) (35) (79)
Net periodic pension (income) cost $ 311 $ 309 $ 328