Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Income tax on unrealized holding during period	$ 3,494,545	$ 5,010,679	$ 5,895,784	$ 9,328,913
Income tax on reclassification adjustment for gains	$ 446,127	$ 835,927	$ 1,751,153	$ 2,430,219