CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income:	$ 10,439,644	$ 6,371,847	$ 18,804,598	$ 9,876,571
Other comprehensive income, net of tax:
Increase in net gains on securities available-for-sale, net of deferred tax expense	1,006,624	11,567,877	159,212	11,275,060
Total comprehensive income	$ 11,446,268	$ 17,939,724	$ 18,963,810	$ 21,151,631