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Employee Benefit Plans (Components of the Net Periodic Pension Plan Cost) (SERP) (Details) - SERP [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 28 $ 26 $ 56 $ 52
Interest cost 75 72 150 144
Amortization of recognized (gain)/ loss 41 36 81 73
Amortization of prior service cost 0 0 (1) (1)
Net pension expense/(credit) included in employee benefits $ 144 $ 134 $ 286 $ 268