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Employee Benefit Plans (Components of Net Periodic Pension Plan Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 57 $ 66 $ 169 $ 199
Interest Cost 406 437 1,219 1,311
Expected return on assets (887) (764) (2,661) (2,292)
Amortization of net actuarial/recognized loss 358 269 1,074 807
Net pension (credit)/expense included in employee benefits (66) 8 (199) 25
SERP [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 31 24 93 71
Interest Cost 67 82 201 247
Amortization of net actuarial/recognized loss 47 29 141 87
Amortization of prior service cost (1) (1) (2) (2)
Net pension (credit)/expense included in employee benefits $ 144 $ 134 $ 433 $ 403