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Qualified Employee Benefit Plans - Amounts Included in Accumulated Other Comprehensive Income (Loss) (Details) - Retirement Plan - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Unrecognized net loss from experience different from that assumed and effects of changes and assumptions $ (43,768) $ (59,625)
Prior service cost (683) (707)
Pension and other postretirement benefit plans, accumulated other comprehensive loss, before tax (44,451) (60,332)
Income tax benefit 210 296
Accumulated other comprehensive loss $ (44,241) $ (60,036)