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Employee Benefit Plans (Actuarial Assumptions) (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.44% 3.33%  
Defined Benefit Plan, Assumptions Used Calculating Net Period Benefit Cost, Benefit Obligation, Discount Rate 3.33% 4.37% 3.69%
Effective rate for interest on benefit obligation (percent) 2.88% 4.01% 3.28%
Expected return on plan assets (percent) 7.00% 7.50% 7.50%
Cumulative Gains and Losses Amortization Period Limit 12 years