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Employee Benefit Plans (Summary of Other Post-Retirement Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
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