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Consolidated Balance Sheets (FY) (Parenthetical) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]        
Allowance for loan losses (in dollars) $ 7,073,937 $ 5,860,291 $ 5,105,000 $ 4,354,000
Preferred Stock, Par value (in dollars per share) $ 1 $ 1 $ 1  
Preferred stock, shares authorized 2,000,000 2,000,000 2,000,000  
Preferred stock, shares issued 0 0 12,000  
Preferred stock, shares outstanding 0 0 12,000  
Common stock, par value (in dollars per share) $ 1 $ 1 $ 1  
Common stock, shares authorized 40,000,000 40,000,000 40,000,000  
Common stock, shares issued 12,704,581 11,152,561 5,896,033  
Common stock, shares outstanding 12,704,581 11,152,561 5,896,033