Loans and Allowance for Loan Losses - Schedule of Allowance for Loan Losses Methodology (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Beginning balance	$ 3,043,632	$ 3,124,611
Charge-offs	94,346	447,747
Recoveries	5,623	66,768
Net charge-offs	88,723	380,979
Provisions charged to operations	215,500	300,000
Individually evaluated for impairment	454,273	331,779
Collectively evaluated for impairment	2,716,136	2,711,853
Balance at end of period	3,170,409	3,043,632
Individually evaluated for impairment	7,317,834	8,062,312
Collectively evaluated for impairment	327,885,317	322,128,999
Balance at end of period	335,203,151	330,191,311
Commercial, Financial And Agricultural [Member]
Beginning balance	324,260	191,267
Charge-offs	86,654	113,334
Recoveries	5,623	63,486
Net charge-offs	81,031	49,848
Provisions charged to operations	48,762	182,841
Individually evaluated for impairment	189,015	44,468
Collectively evaluated for impairment	102,976	279,792
Balance at end of period	291,991	324,260
Individually evaluated for impairment	518,911	459,003
Collectively evaluated for impairment	72,365,309	72,687,394
Balance at end of period	72,884,220	73,146,397
Construction Real Estate [Member]
Beginning balance	1,043,083	1,043,083
Charge-offs	783	0
Recoveries	0	0
Net charge-offs	783	0
Provisions charged to operations	391	0
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,042,691	1,043,083
Balance at end of period	1,042,691	1,043,083
Individually evaluated for impairment	303,250	428,799
Collectively evaluated for impairment	24,095,420	21,858,213
Balance at end of period	24,398,670	22,287,012
Commercial Real Estate [Member]
Beginning balance	1,056,595	1,192,098
Charge-offs	0	168,717
Recoveries	0	0
Net charge-offs	0	168,717
Provisions charged to operations	84,178	33,214
Individually evaluated for impairment	57,021	57,403
Collectively evaluated for impairment	1,083,752	999,192
Balance at end of period	1,140,773	1,056,595
Individually evaluated for impairment	4,097,190	4,561,198
Collectively evaluated for impairment	100,723,719	101,897,144
Balance at end of period	104,820,909	106,458,342
Residential Real Estate [Member]
Beginning balance	416,474	420,189
Charge-offs	6,909	59,764
Recoveries	0	0
Net charge-offs	6,909	59,764
Provisions charged to operations	33,265	56,049
Individually evaluated for impairment	204,979	224,916
Collectively evaluated for impairment	237,851	191,558
Balance at end of period	442,830	416,474
Individually evaluated for impairment	2,239,108	2,448,531
Collectively evaluated for impairment	98,579,369	96,711,076
Balance at end of period	100,818,477	99,159,607
Agricultural Real Estate [Member]
Beginning balance	11,560	86,656
Charge-offs	0	93,503
Recoveries	0	0
Net charge-offs	0	93,503
Provisions charged to operations	46,651	18,407
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	58,211	11,560
Balance at end of period	58,211	11,560
Individually evaluated for impairment	139,919	142,966
Collectively evaluated for impairment	27,577,877	25,230,655
Balance at end of period	27,717,796	25,373,621
Consumer and Other [Member]
Beginning balance	191,660	191,318
Charge-offs	0	12,429
Recoveries	0	3,282
Net charge-offs	0	9,147
Provisions charged to operations	2,253	9,489
Individually evaluated for impairment	3,258	4,992
Collectively evaluated for impairment	190,655	186,668
Balance at end of period	193,913	191,660
Individually evaluated for impairment	19,456	21,815
Collectively evaluated for impairment	4,543,623	3,744,517
Balance at end of period	$ 4,563,079	$ 3,766,332