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Qualified Employee Benefit Plans - Amounts Included in Accumulated Other Comprehensive Income (Loss) (Details) - Retirement Plan - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Unrecognized net loss from experience different from that assumed and effects of changes and assumptions $ (22,899) $ (28,433)
Prior service cost (611) (635)
Pension and other postretirement benefit plans, accumulated other comprehensive loss, before tax (23,510) (29,068)
Income tax benefit 147 168
Accumulated other comprehensive loss $ (23,363) $ (28,900)