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Benefits Plans (Net Periodic Pension and SERP Expense) (Details) - Pension Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 245	$ 310
Expected return on assets	(441)	(404)
Amortization of net loss	316	312
Net Periodic Pension Cost (Credit)	$ 120	$ 218
Valuation assumptions used to determine net periodic benefit cost for the year: Discount rate	3.22%	4.22%
Valuation assumptions used to determine net periodic benefit cost for the year: Long term rate of return on plan assets	6.00%	6.00%
Valuation assumptions used to determine net periodic benefit cost for the year: Salary increase rate

X

- Definition

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

+ References

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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