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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-Tax | $ 140 | $ 44 | $ 421 | $ 131
After-Tax | 140 | 44 | 421 | 131
Accumulated Defined Benefit Plans Adjustment, Actuarial Gain (Loss) Attributable to Parent [Member] | Pension Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-Tax |  |  | 421 |
After-Tax |  |  | $ 421 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Pension Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-Tax | 140 | 138 |  | 412
After-Tax | $ 140 | 138 |  | 412
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Postretirement Benefit Plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-Tax |  | (98) |  | (292)
After-Tax |  | (98) |  | (292)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Postretirement Benefit Plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-Tax |  | 4 |  | 11
After-Tax |  | $ 4 |  | $ 11

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