CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) [Abstract]
Net income	$ 16,367,123	$ 13,448,125
Other comprehensive income (loss), net of tax:
Decrease in net gains on securities available-for-sale, net of tax	4,945,912	(2,270,910)
Change in fair value of cash flow hedges, net of tax	(1,294,306)	0
Total comprehensive income	$ 20,018,729	$ 11,177,215