Retirement Plans - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Pension plan
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net (gain) loss	$ (792)	$ 282
Recognition of net actuarial gain or (loss)	(74)	(67)
Total changes	(866)	215
Changes, net of taxes	(624)	155
SERP liability adjustments
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net (gain) loss	(206)	708
Recognition of net actuarial gain or (loss)	(125)	(86)
Total changes	(331)	622
Changes, net of taxes	$ (239)	$ 448

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

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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