Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	$ 1,497,994	$ (21,323,919)	$ (16,270,854)	$ (41,952,050)
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	913,838	130,405	950,812	218,981
Provision for income taxes	(191,906)	(27,385)	(199,671)	(45,986)
Total net reclassifications for the period	$ 721,932	$ 103,020	$ 751,141	$ 172,995