Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	$ (21,815,866)	$ (17,768,848)
Amounts Reclassified from Other Comprehensive Income | Unrealized gains (losses) on available-for-sale debt securities
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Realized gain on sale of securities	444,752	36,974
Provision for income taxes	(93,398)	(7,765)
Total net reclassifications for the period	$ 351,354	$ 29,209