Qualified Employee Benefit Plans - Amounts Recognized in Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Changes in employee benefit related items	$ 9,159	$ 6,946	$ 15,767
Income tax (expense)	(79)	(95)	(59)
Employee benefit related items, net of tax	9,080	6,851	15,708
Retirement Plan
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized net gain (loss) from experience different from that assumed and effects of changes and assumptions	8,815	6,519	15,858
Prior service cost	24	24	24
Changes in employee benefit related items	8,839	6,543	15,882
Income tax (expense)	(9)	(33)	(87)
Employee benefit related items, net of tax	$ 8,830	$ 6,510	$ 15,795

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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