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Employee Benefit Plans (Summary of Other Post-Retirement Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferred compensation agreement costs | $ 278 | $ 304 | $ 280
Deferred compensation agreement liabilities | 6,093 | 6,570 | 6,923
Cash Surrender Value of Life Insurance | $ 5,916 | $ 6,544 | $ 6,807

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