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 |