CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) [Abstract]
Net income	$ 18,196,822	$ 14,646,950	$ 51,733,929	$ 42,405,607
Other comprehensive income (loss), net of tax:
Decrease in net gains on securities available-for-sale, net of tax	(739,313)	(1,191,495)	9,311,318	(17,396,100)
Change in fair value of cash flow hedges, net of tax	273,312	(421,473)	(2,556,206)	2,925,895
Net loss on sale of investment securities reclassified out of comprehensive income into net income, net of tax	(17,758)	875,838	(17,758)	891,177
Total comprehensive income	$ 17,713,063	$ 13,909,820	$ 58,471,283	$ 28,826,579