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Loans and Allowance for Loan Losses - Loan Risk Rating (Q2) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 1,575,435 | $ 1,323,258 | $ 813,376
Commercial Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 745,864 | 642,988 | 415,208
Consumer Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 355,876 | 293,457 | 187,802
Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 179,431 | 135,409 | 117,869
Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 279,771 | 238,087 | 85,022
Consumer and Other [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 14,493 | 13,317 | 7,475
Non PCI Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,542,777 | 1,290,464 | 786,183
Non PCI Loans [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,531,710 | 1,270,417 | 782,438
Non PCI Loans [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 5,992 | 13,668 | 1,531
Non PCI Loans [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,507 | 3,852 | 341
Non PCI Loans [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,529 | 2,241 | 1,873
Non PCI Loans [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 39 | 286 | 0
Non PCI Loans [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 727,390 | 625,085 | 400,265
Non PCI Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 724,763 | 616,028 | 399,505
Non PCI Loans [Member] | Commercial Real Estate [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,604 | 7,673 | 640
Non PCI Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 1,006 | 0
Non PCI Loans [Member] | Commercial Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,023 | 378 | 120
Non PCI Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 0 | 0
Non PCI Loans [Member] | Consumer Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 348,889 | 286,007 | 178,798
Non PCI Loans [Member] | Consumer Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 343,407 | 279,464 | 177,466
Non PCI Loans [Member] | Consumer Real Estate [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,168 | 2,543 | 550
Non PCI Loans [Member] | Consumer Real Estate [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 949 | 2,627 | 104
Non PCI Loans [Member] | Consumer Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,365 | 1,159 | 678
Non PCI Loans [Member] | Consumer Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 214 | 0
Non PCI Loans [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 173,741 | 130,289 | 116,191
Non PCI Loans [Member] | Construction and Land Development [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 172,972 | 129,359 | 115,237
Non PCI Loans [Member] | Construction and Land Development [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 62 | 383 | 89
Non PCI Loans [Member] | Construction and Land Development [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 160 | 0 | 0
Non PCI Loans [Member] | Construction and Land Development [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 547 | 547 | 865
Non PCI Loans [Member] | Construction and Land Development [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 0 | 0
Non PCI Loans [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 278,950 | 237,229 | 83,454
Non PCI Loans [Member] | Commercial and Industrial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 277,384 | 233,942 | 82,992
Non PCI Loans [Member] | Commercial and Industrial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,035 | 3,007 | 252
Non PCI Loans [Member] | Commercial and Industrial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 35 | 64 | 0
Non PCI Loans [Member] | Commercial and Industrial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 483 | 157 | 210
Non PCI Loans [Member] | Commercial and Industrial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 13 | 59 | 0
Non PCI Loans [Member] | Consumer and Other [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 13,807 | 11,854 | 7,475
Non PCI Loans [Member] | Consumer and Other [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 13,184 | 11,624 | 7,238
Non PCI Loans [Member] | Consumer and Other [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 123 | 62 | 0
Non PCI Loans [Member] | Consumer and Other [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 363 | 155 | 237
Non PCI Loans [Member] | Consumer and Other [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 111 | 0 | 0
Non PCI Loans [Member] | Consumer and Other [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 26 | 13 | 0
Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 32,658 | 32,794 | 27,193
Purchased Credit Impaired Loans [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 23,800 | 23,558 | 21,173
Purchased Credit Impaired Loans [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,084 | 2,637 | 3,289
Purchased Credit Impaired Loans [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,854 | 538 | 12
Purchased Credit Impaired Loans [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,920 | 5,308 | 2,692
Purchased Credit Impaired Loans [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 753 | 27
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 18,474 | 17,903 | 14,943
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 14,494 | 14,386 | 11,836
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,513 | 261 | 1,045
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,393 | 0 | 0
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,074 | 3,084 | 2,062
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 172 | 0
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 6,987 | 7,450 | 9,004
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 4,558 | 4,151 | 6,811
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 898 | 1,345 | 1,577
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 575 | 456 | 0
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 956 | 1,192 | 616
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 306 | 0
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 5,690 | 5,120 | 1,678
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,973 | 4,134 | 1,019
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 653 | 649 | 645
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 716 | 0 | 0
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 348 | 337 | 14
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 0 | 0
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 821 | 858 | 1,568
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 210 | 68 | 1,507
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2 | 120 | 22
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 153 | 58 | 12
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 456 | 588 | 0
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 24 | 27
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 686 | 1,463 | 0
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 565 | 819 | 0
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 18 | 262 | 0
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 17 | 24 | 0
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 86 | 107 | 0
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 0 | $ 251 | $ 0

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