Loans - Schedule of Activity in Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	$ 9,723,431	$ 8,556,143	$ 9,139,488	$ 7,909,682
Provision for loan losses	438,514	278,148	1,047,179	989,231
Charge-offs	(622,917)		(650,840)	(75,895)
Recoveries	11,740	74,784	14,941	86,057
Ending balance	9,550,768	8,909,075	9,550,768	8,909,075
Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	4,804,469	4,403,116	4,801,297	4,217,089
Provision for loan losses	271,117	267,093	274,289	453,120
Ending balance	5,075,586	4,670,209	5,075,586	4,670,209
SBA Loans-Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	977,635	982,680	1,082,065	892,605
Provision for loan losses	29,735	33,254	(74,883)	123,329
Recoveries			188
Ending balance	1,007,370	1,015,934	1,007,370	1,015,934
SBA Loans—Non-Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	535,929	450,257	537,967	59,032
Provision for loan losses	88,800	100,577	111,672	556,424
Charge-offs	(57,310)		(85,233)	(75,895)
Recoveries	6,287	1,500	9,300	12,773
Ending balance	573,706	552,334	573,706	552,334
Commercial and Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	1,877,197	1,318,063	1,265,456	1,322,294
Provision for loan losses	42,502	(51,390)	654,243	(55,621)
Charge-offs	(565,607)		(565,607)
Recoveries	5,453		5,453
Ending balance	1,359,545	1,266,673	1,359,545	1,266,673
Home Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	1,489,081	1,353,379	1,407,742	1,363,628
Provision for loan losses	12,189	3,820	93,528	(6,429)
Ending balance	1,501,270	1,357,199	1,501,270	1,357,199
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	39,120	48,648	44,961	55,034
Provision for loan losses	(5,829)	(75,206)	(11,670)	(81,592)
Recoveries		73,284		73,284
Ending balance	$ 33,291	$ 46,726	$ 33,291	$ 46,726