Loans and Allowance for Loan Losses - Schedule of Allowance for Loan Losses Methodology (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Beginning balance	$ 3,170,409	$ 3,043,632	$ 3,124,611
Charge-offs	122,175	216,521	447,747
Recoveries	4,463	10,086	66,768
Net charge-offs	117,712	206,435	380,979
Provisions charged to operations	140,000	355,500	300,000
Individually evaluated for impairment	563,476	563,476	331,779
Collectively evaluated for impairment	2,629,221	2,629,221	2,711,853
Balance at end of period	3,192,697	3,192,697	3,043,632
Individually evaluated for impairment	7,771,344	7,771,344	8,062,312
Collectively evaluated for impairment	338,098,172	338,098,172	322,128,999
Balance at end of period	345,869,516	345,869,516	330,191,311
Commercial, Financial And Agricultural [Member]
Beginning balance	291,991	324,260	191,267
Charge-offs	122,175	208,829	113,334
Recoveries	1,653	7,276	63,486
Net charge-offs	120,522	201,553	49,848
Provisions charged to operations	266,192	314,954	182,841
Individually evaluated for impairment	306,543	306,543	44,468
Collectively evaluated for impairment	131,118	131,118	279,792
Balance at end of period	437,661	437,661	324,260
Individually evaluated for impairment	1,033,748	1,033,748	459,003
Collectively evaluated for impairment	77,147,954	77,147,954	72,687,394
Balance at end of period	78,181,702	78,181,702	73,146,397
Construction Real Estate [Member]
Beginning balance	1,042,691	1,043,083	1,043,083
Charge-offs	0	783	0
Recoveries	0	0	0
Net charge-offs	0	783	0
Provisions charged to operations	(104,001)	(103,610)	0
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	938,690	938,690	1,043,083
Balance at end of period	938,690	938,690	1,043,083
Individually evaluated for impairment	299,825	299,825	428,799
Collectively evaluated for impairment	23,638,846	23,638,846	21,858,213
Balance at end of period	23,938,671	23,938,671	22,287,012
Commercial Real Estate [Member]
Beginning balance	1,140,773	1,056,595	1,192,098
Charge-offs	0	0	168,717
Recoveries	0	0	0
Net charge-offs	0	0	168,717
Provisions charged to operations	(56,296)	27,882	33,214
Individually evaluated for impairment	55,338	55,338	57,403
Collectively evaluated for impairment	1,029,139	1,029,139	999,192
Balance at end of period	1,084,477	1,084,477	1,056,595
Individually evaluated for impairment	4,211,744	4,211,744	4,561,198
Collectively evaluated for impairment	99,045,131	99,045,131	101,897,144
Balance at end of period	103,256,875	103,256,875	106,458,342
Residential Real Estate [Member]
Beginning balance	442,830	416,474	420,189
Charge-offs	0	6,909	59,764
Recoveries	0	0	0
Net charge-offs	0	6,909	59,764
Provisions charged to operations	2,366	35,631	56,049
Individually evaluated for impairment	199,229	199,229	224,916
Collectively evaluated for impairment	245,967	245,967	191,558
Balance at end of period	445,196	445,196	416,474
Individually evaluated for impairment	2,070,770	2,070,770	2,448,531
Collectively evaluated for impairment	101,491,403	101,491,403	96,711,076
Balance at end of period	103,562,173	103,562,173	99,159,607
Agricultural Real Estate [Member]
Beginning balance	58,211	11,560	86,656
Charge-offs	0	0	93,503
Recoveries	1,200	1,200	0
Net charge-offs	(1,200)	(1,200)	93,503
Provisions charged to operations	31,611	78,262	18,407
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	91,022	91,022	11,560
Balance at end of period	91,022	91,022	11,560
Individually evaluated for impairment	136,883	136,883	142,966
Collectively evaluated for impairment	31,698,458	31,698,458	25,230,655
Balance at end of period	31,835,341	31,835,341	25,373,621
Consumer and Other [Member]
Beginning balance	193,913	191,660	191,318
Charge-offs	0	0	12,429
Recoveries	1,610	1,610	3,282
Net charge-offs	(1,610)	(1,610)	9,147
Provisions charged to operations	128	2,381	9,489
Individually evaluated for impairment	2,366	2,366	4,992
Collectively evaluated for impairment	193,285	193,285	186,668
Balance at end of period	195,651	195,651	191,660
Individually evaluated for impairment	18,374	18,374	21,815
Collectively evaluated for impairment	5,076,380	5,076,380	3,744,517
Balance at end of period	$ 5,094,754	$ 5,094,754	$ 3,766,332