Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Income tax (benefit) expense on unrealized holding income arising during the period	$ (2,040,125)	$ 2,288,044	$ (1,604,947)	$ 4,546,126
Income tax expense on reclassification adjustment for gains	$ 136,662	$ 691,619	$ 502,944	$ 661,518