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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 26 $ 24 $ 78 $ 73
Interest cost 72 62 216 187
Amortization of recognized (gain)/ loss 37 20 110 59
Amortization of prior service cost (1) 5 (2) 15
Net pension expense/(credit) included in employee benefits $ 134 $ 111 $ 402 $ 334