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Loans and Allowance for Loan Losses (FY) (Details 6) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Impaired loans with a valuation allowance, Related Allowance $ 354 $ 461  
Total impaired loans, Recorded Investment 3,232 2,657  
Total impaired loans, Unpaid Principal Balance 3,390 2,826  
Total impaired loans, Average Recorded Investment 2,963 2,005  
Total impaired loans, Interest Income Recognized 51 129  
All Other Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans without a valuation allowance, Recorded Investment 2,471 1,427 $ 1,851
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,512 1,462 1,879
Impaired loans without a valuation allowance, Average Recorded Investment 1,979 1,277 4,659
Impaired loans without a valuation allowance, Interest Income Recognized 30 63 180
Impaired loans with a valuation allowance, Recorded Investment 734 1,214 164
Impaired loans with a valuation allowance, Unpaid Principal Balance 751 1,241 243
Impaired loans with a valuation allowance, Related Allowance 335 445 4
Impaired loans with a valuation allowance, Average Recorded Investment 979 725 306
Impaired loans with a valuation allowance, Interest Income Recognized 18 50 70
Total impaired loans, Recorded Investment     2,015
Total impaired loans, Unpaid Principal Balance     2,122
Total impaired loans, Average Recorded Investment     4,965
Total impaired loans, Interest Income Recognized     250
All Other Loans [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans without a valuation allowance, Recorded Investment 1,034 424 119
Impaired loans without a valuation allowance, Unpaid Principal Balance 1,043 454 119
Impaired loans without a valuation allowance, Average Recorded Investment 670 204 1,311
Impaired loans without a valuation allowance, Interest Income Recognized 15 44 73
Impaired loans with a valuation allowance, Recorded Investment 0 23 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 23 0
Impaired loans with a valuation allowance, Related Allowance 0 5 0
Impaired loans with a valuation allowance, Average Recorded Investment 8 5 0
Impaired loans with a valuation allowance, Interest Income Recognized 0 1 0
All Other Loans [Member] | Consumer Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans without a valuation allowance, Recorded Investment 793 415 821
Impaired loans without a valuation allowance, Unpaid Principal Balance 823 420 849
Impaired loans without a valuation allowance, Average Recorded Investment 699 401 2,334
Impaired loans without a valuation allowance, Interest Income Recognized 12 16 100
Impaired loans with a valuation allowance, Recorded Investment 203 1,007 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 216 1,033 0
Impaired loans with a valuation allowance, Related Allowance 37 256 0
Impaired loans with a valuation allowance, Average Recorded Investment 642 601 0
Impaired loans with a valuation allowance, Interest Income Recognized 11 38 0
All Other Loans [Member] | Construction and Land Development [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans without a valuation allowance, Recorded Investment 547 547 865
Impaired loans without a valuation allowance, Unpaid Principal Balance 547 547 865
Impaired loans without a valuation allowance, Average Recorded Investment 547 628 967
Impaired loans without a valuation allowance, Interest Income Recognized 0 0 3
Impaired loans with a valuation allowance, Recorded Investment 0 0 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 0 0
Impaired loans with a valuation allowance, Related Allowance 0 0 0
Impaired loans with a valuation allowance, Average Recorded Investment 0 0 0
Impaired loans with a valuation allowance, Interest Income Recognized 0 0 0
All Other Loans [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans without a valuation allowance, Recorded Investment 81 41 46
Impaired loans without a valuation allowance, Unpaid Principal Balance 83 41 46
Impaired loans without a valuation allowance, Average Recorded Investment 58 44 47
Impaired loans without a valuation allowance, Interest Income Recognized 3 3 4
Impaired loans with a valuation allowance, Recorded Investment 438 172 164
Impaired loans with a valuation allowance, Unpaid Principal Balance 440 172 243
Impaired loans with a valuation allowance, Related Allowance 222 172 4
Impaired loans with a valuation allowance, Average Recorded Investment 257 117 306
Impaired loans with a valuation allowance, Interest Income Recognized 5 10 70
All Other Loans [Member] | Consumer and Other [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans without a valuation allowance, Recorded Investment 16 0 0
Impaired loans without a valuation allowance, Unpaid Principal Balance 16 0 0
Impaired loans without a valuation allowance, Average Recorded Investment 5 0 0
Impaired loans without a valuation allowance, Interest Income Recognized 0 0 0
Impaired loans with a valuation allowance, Recorded Investment 93 12 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 95 13 0
Impaired loans with a valuation allowance, Related Allowance 76 12 0
Impaired loans with a valuation allowance, Average Recorded Investment 72 2 0
Impaired loans with a valuation allowance, Interest Income Recognized 2 1 $ 0
Purchased Credit Impaired Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with a valuation allowance, Recorded Investment   16  
Impaired loans with a valuation allowance, Unpaid Principal Balance   123  
Impaired loans with a valuation allowance, Related Allowance   16  
Impaired loans with a valuation allowance, Average Recorded Investment   3  
Impaired loans with a valuation allowance, Interest Income Recognized   16  
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with a valuation allowance, Related Allowance 19 16  
Total impaired loans, Recorded Investment 27 16  
Total impaired loans, Unpaid Principal Balance 127 123  
Total impaired loans, Average Recorded Investment 5 3  
Total impaired loans, Interest Income Recognized $ 3 $ 16