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Business Combination (FY) (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 01, 2017 | May 19, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total consideration in cash | $ 15,826,000 |  |  |  |  |  |
Ownership interest (as a percent) | 74.00% |  |  |  |  |  |
Pro forma, nonrecurring costs | $ 38,000,000 |  |  |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  |  |  |  |  | $ 5,000,000
Pro forma information, earnings (loss) since acquisition date, actual |  |  |  |  |  |  | 200,000
Pro forma revenue |  |  |  |  |  |  | 24,900,000
Pro forma net income (loss) |  |  |  |  |  |  | 947,000
Atlantic Capital Bank, N.A. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total consideration in cash |  | $ 1,183,007 |  |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  | $ 381,000 |  | $ 754,000 |  | 903,311
Pro forma information, earnings (loss) since acquisition date, actual |  |  | 105,000 |  | 194,000 |  | $ 63,385
Capstone Bancshares Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total consideration in cash | $ 15,826,000 |  |  |  |  |  |
Exchange of shares | 0.85 |  |  |  |  |  |
Cash payment per share (in dollars per share) | $ 18.50 |  |  |  |  |  |
Percentage of common stock consideration transferred | 80.00% |  |  |  |  |  |
Percentage of cash consideration transferred | 20.00% |  |  |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  | 7,600,000 |  | 14,500,000 |  |
Pro forma information, earnings (loss) since acquisition date, actual |  |  | $ 3,400,000 |  | $ 6,000,000 |  |
Pro forma revenue |  |  |  | $ 6,200,000 |  | $ 12,500,000 |
Pro forma net income (loss) |  |  |  | $ 237,000 |  | $ 473,000 |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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