Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	$ (55,554,504)	$ (64,249,308)	$ (75,731,395)
Total reclassifications for the period	360,797,232	347,563,621	424,683,939
Amounts Reclassified from Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	846,918	1,657,938	382,584
Amounts Reclassified from Other Comprehensive Income | Unrealized gains on available-for-sale debt securities
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Realized gain on sale of securities	1,072,048	2,098,656	484,283
Provision for income taxes	$ (225,130)	$ (440,718)	$ (101,699)