Employee Benefits - Actuarial Assumptions (Details)	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.65%	2.26%
Rate of increase in compensation levels	4.50%	5.25%
Interest rate credit for determining projected cash balance	3.50%	3.50%
Pension Plan | BEP
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.32%	1.77%
Rate of increase in compensation levels	4.50%	5.25%
Interest rate credit for determining projected cash balance	3.50%	3.50%
Pension Plan | ODRCP
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.32%	1.81%
Rate of increase in compensation levels	0.00%	0.00%
Supplemental Employee Retirement Plan | DB SERP
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.68%	1.63%
Rate of increase in compensation levels	0.00%	0.00%