Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Provision for Income Taxes	$ (39,289,618)	$ (31,234,449)
Amounts Reclassified from Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	(659,733)	1,697,976
Amounts Reclassified from Other Comprehensive Income | Unrealized gains on available-for-sale securities:
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Realized (loss) gain on sale of securities	(462,724)	2,612,271
Provision for Income Taxes	161,953	(914,295)
Total reclassifications for the period	(300,771)	1,697,976
Amounts Reclassified from Other Comprehensive Income | Unrealized gains (losses) on derivatives
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Realized (loss) gain on sale of securities	(552,250)	0
Provision for Income Taxes	193,288	0
Total reclassifications for the period	$ (358,962)	$ 0