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Loans and Allowance for Loan Losses - Narrative (Q2) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Loan
contract
Dec. 31, 2017
USD ($)
Loan
Dec. 31, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Financing Receivable, Modifications [Line Items]          
Loan portfolio segments | Loan 5        
Allowance for loan losses $ 7,073,937 $ 5,860,291 $ 5,860,291 $ 5,105,000 $ 4,354,000
Number of contracts   0 0    
Foreclosed assets 3,524,239 $ 3,254,392 $ 3,254,392 2,386,239  
Trouble Debt Restructuring [Member]          
Financing Receivable, Modifications [Line Items]          
Loans that met criteria for restructured $ 660,000 41,000 41,000    
Number of contracts, nonaccrual | contract 0        
Residential Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Foreclosed assets $ 1,140,000 $ 545,750 $ 545,750 $ 1,500  
Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Loans that met criteria for restructured $ 622,000        
Number of contracts | Loan 1