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Employee Benefit Plans - Summary of Change in Benefit Obligation (Detail) - Supplemental Employee Retirement Plan [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in Projected Benefit Obligation
Benefit obligation at beginning of year	$ 9,723,866	$ 9,038,825
Interest cost	279,778	340,302
Actuarial loss	1,345,943	712,728
Benefits paid	(544,261)	(367,989)
Benefit obligation at end of year	$ 10,805,326	$ 9,723,866

X

- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

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

+ References

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- Definition

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.

+ References

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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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No definition available.

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- Definition

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

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