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Pension Plans - Qualified Plan - Allocation of Defined Benefit Pension Plans Assets (Details) - Pension Plan [Member] - Qualified Plan [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Plan assets | $ 71,221 | $ 66,000 | $ 59,653
Defined Benefit Plan, Cash [Member] |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Plan assets | 2,457 | 43 |
Mutual Funds [Member] |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Plan assets | $ 68,764 | $ 65,957 |

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