CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net income:	$ 39,653,047	$ 27,965,264
Other comprehensive income (loss), net of tax:
Change in fair value on available-for-sale securities, net of tax	(808,155)	6,431,468
Change in fair value of cash flow hedges, net of tax	(142,956)	(923,703)
Net gain on sale of investment securities reclassified from other comprehensive income into net income, net of tax	0	0
Total other comprehensive income (loss), net of tax	(951,111)	5,507,765
Total comprehensive income	$ 38,701,936	$ 33,473,029