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Loans, Analysis of Past Due Loans (Q2) (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Loan
Dec. 31, 2017
USD ($)
Loan
Dec. 31, 2016
USD ($)
Loan
Analysis of past due loans, segregated by class [Abstract]      
Past due $ 1,987 $ 3,288 $ 2,867
Current loans 372,039 345,391 305,625
Total loans 374,026 348,679 [1] 308,492
Accruing loans 90 or more days past due 25 82 247
30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 966 658 1,420
90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due $ 1,021 $ 2,630 $ 1,447
Number of loans past due for 90 days accruing interest | Loan 1 2 2
Commercial Real Estate [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due $ 1,787 $ 2,416 $ 2,262
Current loans 236,987 210,906 178,355
Total loans 238,774 213,322 180,617
Accruing loans 90 or more days past due 0 0 0
Commercial Real Estate [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 839 398 1,246
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 948 2,018 1,016
Commercial Real Estate [Member] | Residential ADC [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 375 0 0
Current loans 4,879 7,242 2,463
Total loans 5,254 7,242 2,463
Accruing loans 90 or more days past due 0 0 0
Commercial Real Estate [Member] | Residential ADC [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 375 0 0
Commercial Real Estate [Member] | Residential ADC [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Commercial Real Estate [Member] | Commercial ADC [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 2,248
Current loans 25,686 24,364 22,335
Total loans 25,686 24,364 24,583
Accruing loans 90 or more days past due 0 0 0
Commercial Real Estate [Member] | Commercial ADC [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 1,232
Commercial Real Estate [Member] | Commercial ADC [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 1,016
Commercial Real Estate [Member] | Farmland [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Current loans 5,743 5,392 3,826
Total loans 5,743 5,392 3,826
Accruing loans 90 or more days past due 0 0 0
Commercial Real Estate [Member] | Farmland [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Commercial Real Estate [Member] | Farmland [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Commercial Real Estate [Member] | Multifamily [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Current loans 14,061 11,967 11,980
Total loans 14,061 11,967 11,980
Accruing loans 90 or more days past due 0 0 0
Commercial Real Estate [Member] | Multifamily [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Commercial Real Estate [Member] | Multifamily [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Commercial Real Estate [Member] | Owner Occupied [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 1,406 2,272 0
Current loans 94,692 82,536 69,686
Total loans 96,098 84,808 69,686
Accruing loans 90 or more days past due 0 0 0
Commercial Real Estate [Member] | Owner Occupied [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 458 254 0
Commercial Real Estate [Member] | Owner Occupied [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 948 2,018 0
Commercial Real Estate [Member] | Non-owner Occupied [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 6 144 14
Current loans 91,926 79,405 68,065
Total loans 91,932 79,549 68,079
Accruing loans 90 or more days past due 0 0 0
Commercial Real Estate [Member] | Non-owner Occupied [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 6 144 14
Commercial Real Estate [Member] | Non-owner Occupied [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Commercial [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 80 25 85
Current loans 44,487 48,842 43,695
Total loans 44,567 48,867 43,780
Accruing loans 90 or more days past due 0 0 0
Commercial [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 80 0 29
Commercial [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 25 56
Commercial [Member] | Commercial and Industrial [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 80 25 85
Current loans 42,595 47,007 41,850
Total loans 42,675 47,032 41,935
Accruing loans 90 or more days past due 0 0 0
Commercial [Member] | Commercial and Industrial [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 80 0 29
Commercial [Member] | Commercial and Industrial [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 25 56
Commercial [Member] | Agricultural [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Current loans 285 415 209
Total loans 285 415 209
Accruing loans 90 or more days past due 0 0 0
Commercial [Member] | Agricultural [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Commercial [Member] | Agricultural [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Commercial [Member] | Other [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Current loans 1,607 1,420 1,636
Total loans 1,607 1,420 1,636
Accruing loans 90 or more days past due 0 0 0
Commercial [Member] | Other [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Commercial [Member] | Other [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Residential Mortgage [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 87 634 152
Current loans 52,156 48,425 44,546
Total loans 52,243 49,059 44,698
Accruing loans 90 or more days past due 0 79 0
Residential Mortgage [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 39 50 24
Residential Mortgage [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 48 584 128
Residential Mortgage [Member] | First Lien, Closed-End [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 87 185 152
Current loans 51,442 47,751 43,659
Total loans 51,529 47,936 43,811
Accruing loans 90 or more days past due 0 79 0
Residential Mortgage [Member] | First Lien, Closed-End [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 39 50 24
Residential Mortgage [Member] | First Lien, Closed-End [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 48 135 128
Residential Mortgage [Member] | Junior Lien, Closed-End [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 449 0
Current loans 714 674 887
Total loans 714 1,123 887
Accruing loans 90 or more days past due 0 0 0
Residential Mortgage [Member] | Junior Lien, Closed-End [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 0 0
Residential Mortgage [Member] | Junior Lien, Closed-End [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 449 0
Home Equity Lines [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 203 358
Current loans 34,825 33,469 34,761
Total loans 34,825 33,672 35,119
Accruing loans 90 or more days past due 0 3 247
Home Equity Lines [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 200 111
Home Equity Lines [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 0 3 247
Consumer [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 33 10 10
Current loans 3,584 3,749 4,268
Total loans 3,617 3,759 4,278
Accruing loans 90 or more days past due 25 0 0
Consumer [Member] | 30-89 Days Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due 8 10 10
Consumer [Member] | 90 Days or More Past Due [Member]      
Analysis of past due loans, segregated by class [Abstract]      
Past due $ 25 $ 0 $ 0
[1] Derived from Carolina Trust BancShares, Inc.'s audited financial statements included in its 2017 Annual Report on Form 10-K.