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Postretirement Benefit Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Postretirement Health And Life Coverage [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ 404 | $ 475
Director's Retirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | 1,077 | 1,100
Defined Benefit Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ 183 | $ 345

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