Loans and Allowance for Loan and Lease Losses - Summary of Changes in Allowance for Loan and Lease Losses (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 11,633,531	$ 10,132,000
Charged-off loans	(1,124,000)	(774,000)
Recoveries	82,000	4,000
Provision for loan and lease losses	3,404,799	937,216
Ending Balance	13,996,869	10,299,000
Commercial real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	2,655,000	2,879,000
Charged-off loans		(350,000)
Provision for loan and lease losses	602,000	441,000
Ending Balance	3,257,000	2,970,000
Consumer real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	1,013,000	968,000
Provision for loan and lease losses	35,000	(5,000)
Ending Balance	1,048,000	963,000
Construction and land development
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	1,574,000	914,000
Provision for loan and lease losses	(484,000)	(115,000)
Ending Balance	1,090,000	799,000
Commercial and industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	5,618,000	4,693,000
Charged-off loans	(1,124,000)	(300,000)
Recoveries	2,000	4,000
Provision for loan and lease losses	3,517,000	527,000
Ending Balance	8,013,000	4,924,000
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	76,000	103,000
Charged-off loans		(124,000)
Recoveries	80,000
Provision for loan and lease losses	(96,000)	134,000
Ending Balance	60,000	113,000
Other
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	698,000	575,000
Provision for loan and lease losses	(169,000)	(45,000)
Ending Balance	$ 529,000	$ 530,000