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Postretirement Benefit Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Postretirement Health And Life Coverage [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ 342 | $ 404
Director's Retirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | 1,142 | 1,077
Scottdale Defined Benefit Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ 462 | $ 183

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