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Employee Benefit Plans - Schedule of Weighted-Average Assumptions Used (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Benefit Cost for Current Plan Year 6.75% 6.75%
Benefit Cost for Subsequent Plan Year 6.75% 6.75%
Discount Rates:    
Service Cost for Plan Year 3.32% 4.40%
Interest Cost for Plan Year 2.69% 3.87%
Benefit Obligation at End of Plan Year 2.43% 3.13%
Salary Scale Inflation 4.60% 4.60%
Cash Balance Plan Interest Credit Rate 3.75% 3.75%
Post-retirement Benefits    
Discount Rates:    
Service Cost for Plan Year 2.93% 4.14%
Interest Cost for Plan Year 2.43% 3.51%
Benefit Obligation at End of Plan Year 2.07% 2.87%