Employee Benefits Schedule of Weighted Average Actuarial Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Costs (Details)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Medical Plan [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate used in calculating benefit obligation		2.70%	3.40%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate used in calculating net periodic benefit cost		3.40%	4.30%	3.60%
Pension Plan and SERP [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate used in calculating benefit obligation		2.45%	3.13%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate used in calculating net periodic benefit cost		3.21%	4.19%	3.50%
Expected long-term return on plan assets used in calculating net periodic benefit cost		5.70%	5.70%	6.00%
Rate of increase in compensation used in calculating net periodic benefit cost	[1]		3.00%	3.50%

[1] As the Pension Plan was frozen, such that employees do not accrue additional defined benefits for future service or compensation on or after January 1, 2016, rate of increase in compensation for participants is no longer considered an assumption used by the Company to calculate the value of the Pension Plan. As of January 1, 2020, there were no longer any active employees eligible for the SERP. As such, the rate of increase in compensation is only used for the SERP for the years ended December 31, 2019 and 2018.