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Components of Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Average daily balance during the year
Service cost
Interest cost	71	91	213	273
Expected return on plan assets	(213)	(196)	(639)	(588)
Net amortization	75	75	225	226
Total periodic pension income	$ (67)	$ (30)	$ (201)	$ (89)

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