Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	$ (15,309,301)	$ 1,497,994	$ (37,125,167)	$ (16,270,854)
Unrealized gains (losses) on available-for-sale debt securities
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Total net reclassifications for the period	262,969	721,932	614,324	751,141
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	332,872	913,838	777,625	950,812
Provision for income taxes	(69,903)	(191,906)	(163,301)	(199,671)
Total net reclassifications for the period	$ 262,969	$ 721,932	$ 614,324	$ 751,141