Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructuring by Loan Class (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Troubled Debt Restructuring	$ 2,324	$ 4,243
Current [Member]
Troubled Debt Restructuring	2,324	4,243
Default [Member]
Troubled Debt Restructuring	0	0
Accruing [Member]
Troubled Debt Restructuring	2,324	4,243
Non-accruing [Member]
Troubled Debt Restructuring	0	0
Commercial, Financial and Agricultural Loans [Member] | Current [Member]
Troubled Debt Restructuring	0	0
Commercial, Financial and Agricultural Loans [Member] | Default [Member]
Troubled Debt Restructuring	0	0
Commercial, Financial and Agricultural Loans [Member] | Accruing [Member]
Troubled Debt Restructuring	0	0
Commercial, Financial and Agricultural Loans [Member] | Non-accruing [Member]
Troubled Debt Restructuring	0	0
Construction Loans [Member] | Current [Member]
Troubled Debt Restructuring	0	0
Construction Loans [Member] | Default [Member]
Troubled Debt Restructuring	0	0
Construction Loans [Member] | Accruing [Member]
Troubled Debt Restructuring	0	0
Construction Loans [Member] | Non-accruing [Member]
Troubled Debt Restructuring	0	0
Commercial Mortgage Loans [Member] | Current [Member]
Troubled Debt Restructuring	0	0
Commercial Mortgage Loans [Member] | Default [Member]
Troubled Debt Restructuring	0	0
Commercial Mortgage Loans [Member] | Accruing [Member]
Troubled Debt Restructuring	0	0
Commercial Mortgage Loans [Member] | Non-accruing [Member]
Troubled Debt Restructuring	0	0
Residential Loans [Member] | Current [Member]
Troubled Debt Restructuring	2,293	3,397
Residential Loans [Member] | Default [Member]
Troubled Debt Restructuring	0	0
Residential Loans [Member] | Accruing [Member]
Troubled Debt Restructuring	2,293	3,397
Residential Loans [Member] | Non-accruing [Member]
Troubled Debt Restructuring	0	0
Agricultural Loans [Member] | Current [Member]
Troubled Debt Restructuring	0	0
Agricultural Loans [Member] | Default [Member]
Troubled Debt Restructuring	0	0
Agricultural Loans [Member] | Accruing [Member]
Troubled Debt Restructuring	0	0
Agricultural Loans [Member] | Non-accruing [Member]
Troubled Debt Restructuring	0	0
Consumer and Other Loans [Member] | Current [Member]
Troubled Debt Restructuring	31	846
Consumer and Other Loans [Member] | Default [Member]
Troubled Debt Restructuring	0	0
Consumer and Other Loans [Member] | Accruing [Member]
Troubled Debt Restructuring	31	846
Consumer and Other Loans [Member] | Non-accruing [Member]
Troubled Debt Restructuring	$ 0	$ 0