Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 4,813,404	$ 5,686,831	$ 25,246,971	$ 19,006,194
Unrealized gain (loss) on securities:
Unrealized holding gain (loss) during the period, net of income tax expense (benefit)	(1,106,346)	860,268	6,999,494	(2,120,347)
Reclassification adjustment for (gains) losses included in net income, net of income tax expense (benefit)	(661,969)	490,132	(1,432,946)	(443,906)
Other comprehensive (loss) income	(1,768,315)	1,350,400	5,566,548	(2,564,253)
Comprehensive income	$ 3,045,089	$ 7,037,231	$ 30,813,519	$ 16,441,941