Consolidated Statements of Comprehensive Income (Parenthetical) (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]
Income tax on unrealized holding during period	$ 2,198,375	$ 4,075,744	$ 2,401,239	$ 4,318,234
Income tax on reclassification adjustment for gains	$ 519,633	$ 1,467,447	$ 1,305,026	$ 1,594,292