Qualified Employee Benefit Plans - Amounts Recognized in Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Changes in employee benefit related items	$ 6,946	$ 15,767	$ (4,256)
Income tax (expense)	(95)	(59)	(187)
Employee benefit related items, net of tax	6,851	15,708	(4,443)
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	6,519	15,858	(4,089)
Prior service cost	24	24	24
Changes in employee benefit related items	6,543	15,882	(4,065)
Income tax (expense)	(33)	(87)	(216)
Employee benefit related items, net of tax	$ 6,510	$ 15,795	$ (4,281)