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Loans - Detailed Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			$ 3,019,228	$ 3,902,796
(Reversal of) provision for loan losses	$ 88,962	$ (29,586)	(147,811)	(180,806)
Chargeoffs			173,346	266,900
Recoveries			329,879	50,916
Net chargeoffs (recoveries)			(156,533)	215,984
Ending Balance	3,027,950	3,506,006	3,027,950	3,506,006
Loans individually evaluated for impairment					$ 528,937	$ 547,621
Loans collectively evaluated for impairment					2,499,013	2,958,385
Ending Balance	3,027,950	3,506,006	3,027,950	3,506,006	3,027,950	3,506,006
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			2,151,715	3,117,134
(Reversal of) provision for loan losses			481,714	(271,448)
Chargeoffs			98,644	117,157
Recoveries			82,114	19,397
Net chargeoffs (recoveries)			16,530	97,760
Ending Balance	2,616,899	2,747,926	2,616,899	2,747,926
Loans individually evaluated for impairment					528,937	547,621
Loans collectively evaluated for impairment					2,087,962	2,200,305
Ending Balance	2,616,899	2,747,926	2,616,899	2,747,926	2,616,899	2,747,926
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			346,781	257,554
(Reversal of) provision for loan losses			(410,727)	153,428
Chargeoffs			15,347	128,207
Recoveries			197,321	273
Net chargeoffs (recoveries)			(181,974)	127,934
Ending Balance	118,028	283,048	118,028	283,048
Loans collectively evaluated for impairment					118,028	283,048
Ending Balance	118,028	283,048	118,028	283,048	118,028	283,048
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			520,732	528,108
(Reversal of) provision for loan losses			(218,798)	(62,786)
Chargeoffs			59,355	21,536
Recoveries			50,444	31,246
Net chargeoffs (recoveries)			8,911	(9,710)
Ending Balance	293,023	475,032	293,023	475,032
Loans collectively evaluated for impairment					293,023	475,032
Ending Balance	$ 293,023	$ 475,032	$ 293,023	$ 475,032	$ 293,023	$ 475,032