CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net income:	$ 127,224,695	$ 95,509,402	$ 70,471,167
Other comprehensive income (loss), net of tax:
Change in fair value on available-for-sale securities, net of tax	(9,700,933)	(5,582,965)	11,900,309
Change in fair value of cash flow hedges, net of tax	(800,188)	(1,725,136)	(3,699,569)
Net gain on sale of investment securities reclassified from other comprehensive income into net income, net of tax	(240,155)	(335,489)	(17,758)
Total other comprehensive income (loss), net of tax	(10,741,276)	(7,643,590)	8,182,982
Total comprehensive income (loss)	$ 116,483,419	$ 87,865,812	$ 78,654,149