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Employee Benefit Plans (Components of Net Periodic Benefit Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Service cost	$ 1,049	$ 923
Interest cost on projected benefit obligation	551	635
Expected return on plan assets	(1,306)	(1,284)
Amortization of unrecognized prior service credit	(1)	(9)
Amortization of unrecognized net actuarial loss	186	323
Net periodic benefit expense	$ 479	$ 588

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