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Employee Benefit Plans (Components of Net Periodic Pension Plan Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 39 $ 56
Interest Cost 356 407
Expected return on assets (893) (887)
Amortization of net actuarial loss/recognized loss 372 358
Net pension credit included in employee benefits and other expense (126) (66)
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 35 31
Interest Cost 60 67
Amortization of net actuarial loss/recognized loss 75 47
Amortization of prior service cost (1) (1)
Net pension credit included in employee benefits and other expense $ 169 $ 144