Retirement Plans - Net Periodic Pension Cost of Plan (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 151	$ 191	$ 242
Expected return on assets	(193)	(206)	(184)
Amortization of net loss	85	81	97
Net periodic pension cost	$ 43	$ 66	$ 155