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Employee Benefit Plans - Narrative (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) employee post_retirement_benefit_plan	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Retirement Benefits, Description [Abstract]
Requisite period of service (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			2.00%
Expense related to 401(k) plan	$ 185,000	$ 164,000
Unfunded, supplemental retirement benefits payable period (years)	20 years
Pension expense	$ 40,000	43,000
Accrued pension liability	$ 2,894,000	$ 3,031,000	$ 2,949,000
Number of post retirement benefit plans (post retirement benefit plan) | post_retirement_benefit_plan	2
Number of employees currently eligible (employee) | employee	6
Requisite age (in years)	50 years
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	4.25%
Assumed health care cost trend rate	7.00%
Expected future benefit payments, current year	$ 113,000
Estimated plan expense	66,000
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.

+ References

No definition available.

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- Definition

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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- Definition

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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- Definition

Employee Benefit Plan, Requisite Minimum Age

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- Definition

The amount of the benefits expected to be paid during the year.

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- Definition

Number Of Employees Currently Eligible Under Post Retirement Plan

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

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- Definition

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

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- Definition

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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- Definition

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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-Topic 710
-SubTopic 10
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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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- Definition

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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- Definition

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 contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions 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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