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Employee Benefit Plans - Summary of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Detail) - Supplemental Employee Retirement Plan [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net actuarial loss	$ 1,345,943	$ 712,728
Total recognized in other comprehensive income (before tax effects)	1,345,943	712,728
Total recognized in net benefit cost and other comprehensive income (before tax effects)	$ 1,625,721	$ 1,053,030

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- Definition

Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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