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Loans and Allowance for Loan Losses - Narrative (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
loan
segment
Dec. 31, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
Financing Receivable, Modifications [Line Items]      
Loan portfolio segments | segment 5    
Allowance for loan losses $ 7,073,937 $ 5,860,291 $ 5,105,000
Number of contracts | contract   0  
Foreclosed assets 3,524,239 $ 3,254,392  
Trouble Debt Restructuring [Member]      
Financing Receivable, Modifications [Line Items]      
Loans that met criteria for restructured $ 660,000 $ 41,000  
Number of contracts, nonaccrual | loan 0    
Residential Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Foreclosed assets $ 1,140,000    
Commercial Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Loans that met criteria for restructured $ 622,000    
Number of contracts | loan 1