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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 26 $ 24 $ 52 $ 49
Interest cost 72 63 144 125
Amortization of recognized (gain)/ loss 36 20 73 39
Amortization of prior service cost 0 5 (1) 10
Net pension expense/(credit) included in employee benefits $ 134 $ 112 $ 268 $ 223