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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Q2) (Details) - 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 |
Non PCI 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
Non PCI 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
Non PCI 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
Non PCI 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
Non PCI 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
Non PCI 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 |

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