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Income Taxes - Provision for Income Tax (Benefit) Expense (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current federal income tax $ 8,454,358 $ (11,296,704) $ (2,139,061)
Deferred federal income tax 649,928 (4,179,805) 7,137,423
Federal income tax expense (benefit) 9,104,286 (15,476,509) 4,998,362
Pennsylvania income tax 825,000    
Income tax expense (benefit) $ 9,929,286 $ (15,476,509) $ 4,998,362