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Pension Plans - Qualified Plan - Weighted-Average Assumptions Used in Determining Net Periodic Pension Expense (Details) - Pension Plan [Member] - Qualified Plan [Member]
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Discount rate (as a percent) 2.13% 2.40% 3.51%
Rate of compensation increase 0.00% 0.00% 0.00%
Expected long-term rate of return on plan assets 6.00% 6.50% 6.50%