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Loans and Allowance for Loan Losses (FY) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | $ 1,575,435,000 | $ 1,323,258,000 | $ 813,376,000 |
Less: Allowance for loan losses | (7,073,937) | (5,860,291) | (5,105,000) | $ (4,354,000)
Loans, net | 1,568,360,556 | 1,317,397,909 | 808,271,003 |
Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 745,864,000 | 642,988,000 | 415,208,000 |
Less: Allowance for loan losses | (3,135,000) | (2,465,000) | (2,369,000) | (1,906,000)
Consumer Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 355,876,000 | 293,457,000 | 187,802,000 |
Less: Allowance for loan losses | (1,528,000) | (1,596,000) | (1,382,000) | (1,015,000)
Construction and Land Development [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 179,431,000 | 135,409,000 | 117,869,000 |
Less: Allowance for loan losses | (744,000) | (521,000) | (717,000) | (627,000)
Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 279,771,000 | 238,087,000 | 85,022,000 |
Less: Allowance for loan losses | (1,367,000) | (1,062,000) | (520,000) | (777,000)
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 14,493,000 | 13,317,000 | 7,475,000 |
Less: Allowance for loan losses | (300,000) | (216,000) | (117,000) | $ (29,000)
Purchased Credit Impaired Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 32,658,000 | 32,794,000 | 27,193,000 |
Less: Allowance for loan losses | (19,000) | (16,000) | 0 |
Loans, net | 32,639,000 | 32,778,000 | 27,193,000 |
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 18,474,000 | 17,903,000 | 14,943,000 |
Less: Allowance for loan losses | (19,000) | (16,000) | 0 |
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 6,987,000 | 7,450,000 | 9,004,000 |
Less: Allowance for loan losses | 0 | 0 | 0 |
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 5,690,000 | 5,120,000 | 1,678,000 |
Less: Allowance for loan losses | 0 | 0 | 0 |
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 821,000 | 858,000 | 1,568,000 |
Less: Allowance for loan losses | 0 | 0 | 0 |
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 686,000 | 1,463,000 | 0 |
Less: Allowance for loan losses | 0 | 0 | 0 |
All Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 1,542,777,000 | 1,290,464,000 | 786,183,000 |
Less: Allowance for loan losses | (7,055,000) | (5,844,000) | (5,105,000) |
Loans, net | 1,535,722,000 | 1,284,620,000 | 781,078,000 |
All Other Loans [Member] | Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 727,390,000 | 625,085,000 | 400,265,000 |
All Other Loans [Member] | Consumer Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 348,889,000 | 286,007,000 | 178,798,000 |
All Other Loans [Member] | Construction and Land Development [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 173,741,000 | 130,289,000 | 116,191,000 |
All Other Loans [Member] | Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 278,950,000 | 237,229,000 | 83,454,000 |
All Other Loans [Member] | Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | $ 13,807,000 | $ 11,854,000 | $ 7,475,000 |

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