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Employee Benefit Plans - Narrative (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) post_retirement_benefit_plan	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Retirement Benefits, Description [Abstract]
Defined contribution plan service period (in months)	3 months
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution	3.00%
Defined contribution plan employer maximum percentage of annual profit-sharing contribution to plan for benefit of employee (in hundredths)			3.00%
Expense related to 401(k) plan	$ 593,000	$ 653,000
Unfunded, supplemental retirement benefits payable period	20 years
Pension expense	$ 126,000	119,000
Accrued pension liability	$ 2,902,000	$ 2,708,000	$ 2,991,000
Number of post-retirement benefit plans | post_retirement_benefit_plan	2
Post-retirement benefit plan health insurance subsidy range minimum per month per person	$ 40
Post-retirement benefit plan health insurance subsidy range maximum per month per person	$ 1,200
Discount rate	2.00%
Assumed health care cost trend rate	7.00%
Expected future benefit payments, current year	$ 97,000
Estimated plan expense	30,000
Effect of one percentage point increase on accumulated benefit obligation	100,000
Effect of one percentage point increase on interest cost	7,000
Effect of one percentage point increase on service cost	$ 1,000

X

- Definition

The highest percentage of employer match of employee contribution to defined contribution plan based on annual salary.

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Percentage of profit-sharing contributed by the employer to the defined contribution plan. The employee is entitled to receive in the future, subject to vesting and other restrictions, a share in the profits, as defined in the agreement, of the entity or portion thereof. Employer contributions may be discretionary or may be based on a fixed formula related to profits, compensation, or other factors. It is a form of incentive compensation to employees in addition to their regular salary and bonuses.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service cost components of net periodic postretirement health care benefit costs.

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Number of post-retirement benefit plans sponsored by the company.

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Post Employment Plan, Supplemental Benefits, Payment Period Upon Retirement Or Death

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The maximum amount employer will contribute per month to post-retiree for subsidizing the cost of health care insurance.

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The minimum amount employer will contribute per month to post-retiree for subsidizing the cost of health care insurance.

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Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan.

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

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Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

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- Definition

Amount of benefit for defined benefit plan expected to be paid in remainder of current fiscal year.

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Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year.

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Amount of cost for defined contribution plan.

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Amount of cost (reversal of cost) for pension and other postretirement benefits.

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