Qualified Employee Benefit Plans - Amounts Recognized in Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Changes in employee benefit related items	$ 15,767	$ (4,256)	$ (7,867)
Income tax (expense) benefit	(59)	(187)	274
Employee benefit related items, net of tax	15,708	(4,443)	(7,593)
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	15,858	(4,089)	(7,934)
Prior service cost	24	24	24
Changes in employee benefit related items	15,882	(4,065)	(7,910)
Income tax (expense) benefit	(87)	(216)	312
Employee benefit related items, net of tax	$ 15,795	$ (4,281)	$ (7,598)

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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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