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Employee Benefit Plans (Schedule of Net Pension Costs - SERP) (Details) - SERP [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Service cost - benefits earned during the period $ 201 $ 272 $ 304
Interest cost on projected benefit obligation 206 212 203
Net amortization and deferral (79) (221) (101)
Net periodic pension (income) cost $ 328 $ 263 $ 406