CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) [Abstract]
Net income	$ 17,169,980	$ 14,310,530	$ 33,537,102	$ 27,758,657
Other comprehensive income (loss), net of tax:
Decrease in net gains on securities available-for-sale, net of tax	5,104,719	(13,933,693)	10,050,631	(16,204,604)
Change in fair value of cash flow hedges, net of tax	(1,535,212)	3,347,367	(2,829,518)	3,347,367
Net loss on sale of investment securities reclassified out of comprehensive income into net income, net of tax	0	15,339	0	15,339
Total comprehensive income	$ 20,739,487	$ 3,739,543	$ 40,758,215	$ 14,916,759