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Employee Benefit Plans (Schedule of Amounts in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Pension [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax $ 21,241 $ 18,841
Defined Benefit Plan, Accumulated other comprehensive income net of tax 21,241 18,841
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax 1,186 742
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax (3) (7)
Defined Benefit Plan, Accumulated other comprehensive income net of tax $ 1,183 $ 735