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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
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 24 $ 28
Interest cost 82 75
Amortization of recognized (gain)/ loss 29 41
Amortization of prior service cost (1) (1)
Net pension expense/(credit) included in employee benefits $ 134 $ 143