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Loans, Allocation of Allowance for Loan Losses (Q2) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allocation of allowance for loan losses [Abstract]              
Loans individually evaluated for impairment $ 249   $ 248     $ 914  
Loans collectively evaluated for impairment 3,595   3,351     2,479  
Total 3,844 $ 3,780 3,599 [1] $ 3,213 $ 3,471 3,393 $ 3,723
Recorded investment in loans related to allowance for loan losses [Abstract]              
Loans individually evaluated for impairment 4,552   6,357     8,015  
Loans collectively evaluated for impairment 369,474   342,322     300,477  
Commercial Real Estate [Member]              
Allocation of allowance for loan losses [Abstract]              
Loans individually evaluated for impairment 0   0     35  
Loans collectively evaluated for impairment 2,504   2,260     1,572  
Total 2,504 2,459 2,260 1,954 1,692 1,607 2,173
Recorded investment in loans related to allowance for loan losses [Abstract]              
Loans individually evaluated for impairment 2,484   3,623     4,644  
Loans collectively evaluated for impairment 236,290   209,699     175,973  
Commercial [Member]              
Allocation of allowance for loan losses [Abstract]              
Loans individually evaluated for impairment     144     840  
Loans collectively evaluated for impairment     490     331  
Total     634     1,171 542
Recorded investment in loans related to allowance for loan losses [Abstract]              
Loans individually evaluated for impairment     766     1,995  
Loans collectively evaluated for impairment     48,101     41,785  
Commercial [Member] | Commercial and Industrial [Member]              
Allocation of allowance for loan losses [Abstract]              
Loans individually evaluated for impairment 151   144        
Loans collectively evaluated for impairment 457   490        
Total 608 597 634 501 1,132 1,171  
Recorded investment in loans related to allowance for loan losses [Abstract]              
Loans individually evaluated for impairment 685   766        
Loans collectively evaluated for impairment 43,882   48,101        
Residential Mortgage [Member]              
Allocation of allowance for loan losses [Abstract]              
Loans individually evaluated for impairment 96   103     39  
Loans collectively evaluated for impairment 436   402     388  
Total 532 527 505 524 444 427 482
Recorded investment in loans related to allowance for loan losses [Abstract]              
Loans individually evaluated for impairment 1,289   1,861     1,038  
Loans collectively evaluated for impairment 50,954   47,198     43,660  
Consumer and Home Equity Lines [Member]              
Allocation of allowance for loan losses [Abstract]              
Loans individually evaluated for impairment     1     0  
Loans collectively evaluated for impairment     199     188  
Total     200     188 $ 328
Recorded investment in loans related to allowance for loan losses [Abstract]              
Loans individually evaluated for impairment 94   107     338  
Loans collectively evaluated for impairment 38,348   37,324     39,059  
Consumer [Member]              
Allocation of allowance for loan losses [Abstract]              
Loans individually evaluated for impairment 2   1        
Loans collectively evaluated for impairment 198   199        
Total $ 200 $ 197 $ 200 $ 234 $ 203 $ 188  
[1] Derived from Carolina Trust BancShares, Inc.'s audited financial statements included in its 2017 Annual Report on Form 10-K.