Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 9,096,778	$ 7,559,436	$ 4,991,744
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period	(1,180,928)	(945,994)	3,497,157
Reclassification adjustment for gains included in net income	(120,873)	(55,023)	(13,457)
Tax effect	498,460	383,289	(1,333,909)
Net of tax	(803,341)	(617,728)	2,149,791
Unrealized losses on securities transferred to held to maturity:
Reclassification adjustment for losses included in net income	166,879	166,879	166,879
Tax effect	(63,898)	(63,898)	(63,898)
Net of tax	102,981	102,981	102,981
Unrealized gains (losses) on cash flow hedges:
Unrealized holding gains (losses) arising during the period	(330,209)	(1,485,799)	(3,695,434)
Reclassification adjustment for losses included in net income	416,148	37,181
Tax effect	(621,750)	(117,626)	1,414,982
Net of tax	(535,811)	(1,566,244)	(2,280,452)
Other comprehensive income (loss)	(1,236,171)	(2,080,991)	(27,680)
Comprehensive income	$ 7,860,607	$ 5,478,445	$ 4,964,064