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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Interest-Earning Deposits and Certificate of Deposits with Banks (FY) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Dec. 31, 2016
Interest-Earning Deposits and Certificate of Deposits with Banks [Abstract]      
Certificates of deposit with banks $ 1,498 [1] $ 1,498 $ 1,498
Weighted average interest rate 2.66%    
Interest-earning deposits with banks $ 3,647 [1] $ 35,600 $ 18,086
Minimum [Member]      
Interest-Earning Deposits and Certificate of Deposits with Banks [Abstract]      
Interest rate of certificate of deposits 2.45%    
Maximum [Member]      
Interest-Earning Deposits and Certificate of Deposits with Banks [Abstract]      
Maturity of deposits 10 years    
Interest rate of certificate of deposits 3.00%    
[1] Derived from Carolina Trust BancShares, Inc.'s audited financial statements included in its 2017 Annual Report on Form 10-K.