Loans - Schedule of Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Details) - USD ($)	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses Individually Evaluated for Impairment	$ 779,257		$ 353,985
Allowance for Loan Collectively Evaluated for Impairment	8,771,511		8,785,503
Total	9,550,768	$ 9,723,431	9,139,488	$ 8,909,075	$ 8,556,143	$ 7,909,682
Loans Individually Evaluated for Impairment	1,661,455		615,912
Loans Collectively Evaluated for Impairment	850,917,625		749,682,470
Total	852,579,080		750,298,382
Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Collectively Evaluated for Impairment	5,075,586		4,801,297
Total	5,075,586	4,804,469	4,801,297	4,670,209	4,403,116	4,217,089
Loans Collectively Evaluated for Impairment	491,023,849		421,811,734
Total	491,023,849		421,811,734
SBA Loans-Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Collectively Evaluated for Impairment	1,007,370		1,082,065
Total	1,007,370	977,635	1,082,065	1,015,934	982,680	892,605
Loans Individually Evaluated for Impairment	133,674
Loans Collectively Evaluated for Impairment	122,284,378		107,427,788
Total	122,418,052		107,427,788
SBA Loans—Non-Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses Individually Evaluated for Impairment	433,828
Allowance for Loan Collectively Evaluated for Impairment	139,878		537,967
Total	573,706	535,929	537,967	552,334	450,257	59,032
Loans Individually Evaluated for Impairment	433,828
Loans Collectively Evaluated for Impairment	10,247,054		8,655,808
Total	10,680,882		8,655,808
Commercial and Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses Individually Evaluated for Impairment	345,429		353,985
Allowance for Loan Collectively Evaluated for Impairment	1,014,116		911,471
Total	1,359,545	1,877,197	1,265,456	1,266,673	1,318,063	1,322,294
Loans Individually Evaluated for Impairment	1,093,953		353,985
Loans Collectively Evaluated for Impairment	103,482,277		103,601,098
Total	104,576,230		103,955,083
Home Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Collectively Evaluated for Impairment	1,501,270		1,407,742
Total	1,501,270	1,489,081	1,407,742	1,357,199	1,353,379	1,363,628
Loans Individually Evaluated for Impairment			241,164
Loans Collectively Evaluated for Impairment	120,746,233		104,239,551
Total	120,746,233		104,480,715
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Collectively Evaluated for Impairment	33,291		44,961
Total	33,291	$ 39,120	44,961	$ 46,726	$ 48,648	$ 55,034
Loans Individually Evaluated for Impairment			20,763
Loans Collectively Evaluated for Impairment	3,133,834		3,946,491
Total	$ 3,133,834		$ 3,967,254