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Qualified Employee Benefit Plans - Amounts Included in Accumulated Other Comprehensive Income (Loss) (Details) - Retirement Plan - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Unrecognized net loss from experience different from that assumed and effects of changes and assumptions $ (37,249) $ (43,768)
Prior service cost (659) (683)
Pension and other postretirement benefit plans, accumulated other comprehensive loss, before tax (37,908) (44,451)
Income tax benefit 177 210
Accumulated other comprehensive loss $ (37,731) $ (44,241)