Supplemental Financial Data - Schedule of Components of Operating Expenses (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Income Statement Elements [Abstract]
Bank card interchange fees	$ 576,359	$ 600,619	$ 506,506
Other professional fees	287,273	317,147	202,267
Advertising & public relations	264,269	192,016	173,595
Directors & board committee fees	241,523	278,821	328,919
FDIC insurance assessment	233,878	247,963	201,605
Administrative expense - employee benefit plans	209,399	207,602	231,311
Telephone expense	$ 284,586	$ 180,559	$ 155,393