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Benefit Plans, Change in Benefit Obligation, Plan Assets and Funded Status (Details) - SERP [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Benefit Plans [Abstract]
Percentage of final average earnings	55.00%
Maximum annual retirement benefits paid to participant from all sources	$ 125
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of the year	8,299	$ 7,394
Interest cost	266	315	$ 290
Actuarial losses	791	906
Benefits paid	(355)	(316)
Benefit obligation at end of year	9,001	8,299	$ 7,394
Change in Plan Assets [Roll Forward]
Employer contribution	355	316
Benefits paid	(355)	(316)
Fair value of plan assets at end of year	0	0
Funded status of the plan - (underfunded)	(9,001)	(8,299)
Accumulated benefit obligations	$ 9,001	$ 8,299

X

- Definition

The maximum amount of annual retirement benefits that may be paid to a participant from all sources, including the Company's former pension plan, Social Security and the Company's non-qualified, non-contributory supplemental executive retirement plan (the "SERP").

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The percentage of final average earnings used to calculate annual benefits under the defined benefit plan.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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

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