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Benefit Plans (Components of net periodic benefit cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Interest cost on benefit obligation	$ 306	$ 378	$ 388
Expected return on plan assets	(488)	(452)	(554)
Amortization of unrecognized actuarial net loss	206	214	242
Settlement loss	152	128	269
Net periodic benefit cost	$ 176	$ 268	$ 345

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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