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Income Taxes - Reconciliation of Federal Income Tax Rate (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income (loss) before income taxes	$ 57,081,030	$ (48,236,849)	$ 12,114,462
Computed "expected" taxes	11,987,016	(10,129,738)	4,240,062
Tax-exempt interest	(1,325,197)	(1,521,090)	(3,241,530)
Proration	357,044	405,204	518,948
Effect of tax reform			4,752,547
Dividends received deduction	(1,913,238)	(99,726)	(508,409)
Net operating loss carryback		(4,210,523)
Tax benefit on exercise of options	(64,765)	(25,938)	(873,515)
Other, net	236,676	105,302	110,259
Pennsylvania income tax, net of federal benefit	651,750
Income tax expense (benefit)	$ 9,929,286	$ (15,476,509)	$ 4,998,362

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