Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 5,104,818	$ 11,848,913
Unrealized gain on securities:
Unrealized holding gain during the period, net of income tax expense of $1,078,868 and $2,296,547	2,003,613	4,265,018
Reclassification adjustment for gains included in net income, net of income tax expense of $892,141 and $164,829	(1,656,834)	(306,112)
Other comprehensive income	346,779	3,958,906
Comprehensive income	$ 5,451,597	$ 15,807,819