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Loans and Allowance for Loan Losses - Past Due Loans (Q2) (Details) - 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
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
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
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
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
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
Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 32,658 | 32,794 | 27,193
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 18,474 | 17,903 | 14,943
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 6,987 | 7,450 | 9,004
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 5,690 | 5,120 | 1,678
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 821 | 858 | 1,568
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 686 | 1,463 | 0
30-89 Days Past Due and Accruing [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Recorded investment, past due | 4,568 | 1,996 | 2,054
30-89 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
30-89 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
30-89 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
30-89 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
30-89 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

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