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Employee Benefit Plans - Summary of Change in Benefit Obligation (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Plan [Member]    
Change in Projected Benefit Obligation    
Benefit obligation at beginning of year   $ 52,197,520
Interest cost   28,282
Actuarial (gain) loss   77,121
Settlements   (52,057,333)
Benefits paid   (245,590)
Supplemental Employee Retirement Plan [Member]    
Change in Projected Benefit Obligation    
Benefit obligation at beginning of year $ 9,038,825 9,616,702
Interest cost 340,302 319,143
Actuarial (gain) loss 712,728 (540,666)
Benefits paid (367,989) (356,354)
Benefit obligation at end of year $ 9,723,866 $ 9,038,825