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Loans and Allowance for Loan Losses (FY) (Details 5) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Nonaccrual $ 1,538 $ 1,764 $ 1,415
Total Past Due and Nonaccrual 6,773 5,269 4,168
Current Loans 1,536,004 1,285,195 782,015
Total loans 1,575,435 1,323,258 813,376
Purchased Credit Impaired Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 32,658 32,794 27,193
Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Nonaccrual 6 128 0
Total Past Due and Nonaccrual 2,716 1,373 395
Current Loans 724,674 623,712 399,870
Total loans 745,864 642,988 415,208
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 18,474 17,903 14,943
Consumer Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Nonaccrual 463 991 386
Total Past Due and Nonaccrual 1,240 1,987 1,780
Current Loans 347,649 284,020 177,018
Total loans 355,876 293,457 187,802
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 6,987 7,450 9,004
Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Nonaccrual 547 547 865
Total Past Due and Nonaccrual 1,288 938 1,555
Current Loans 172,453 129,351 114,636
Total loans 179,431 135,409 117,869
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 5,690 5,120 1,678
Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Nonaccrual 430 85 164
Total Past Due and Nonaccrual 1,190 502 421
Current Loans 277,760 236,727 83,033
Total loans 279,771 238,087 85,022
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 821 858 1,568
Consumer and Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Nonaccrual 92 13 0
Total Past Due and Nonaccrual 339 469 17
Current Loans 13,468 11,385 7,458
Total loans 14,493 13,317 7,475
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 686 1,463 0
30 to 89 Days Past Due and Accruing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 4,568 1,996 2,054
30 to 89 Days Past Due and Accruing [Member] | Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 2,628 517 395
30 to 89 Days Past Due and Accruing [Member] | Consumer Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 701 963 695
30 to 89 Days Past Due and Accruing [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 403 65 690
30 to 89 Days Past Due and Accruing [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 647 286 257
30 to 89 Days Past Due and Accruing [Member] | Consumer and Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 189 165 17
Past Due 90 Days or More and Accruing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 667 1,509 699
Past Due 90 Days or More and Accruing [Member] | Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 82 728 0
Past Due 90 Days or More and Accruing [Member] | Consumer Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 76 33 699
Past Due 90 Days or More and Accruing [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 338 326 0
Past Due 90 Days or More and Accruing [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due 113 131 0
Past Due 90 Days or More and Accruing [Member] | Consumer and Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, past due $ 58 $ 291 $ 0