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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 24 $ 28 $ 71 $ 84
Interest cost 82 76 247 226
Amortization of recognized loss 29 40 87 121
Amortization of prior service cost (1) (1) (2) (2)
Net pension expense/(credit) included in employee benefits and other expense $ 134 $ 143 $ 403 $ 429