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Small Business Lending Fund (FY) (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2017 | Jan. 30, 2017 | Feb. 04, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2011
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 0 |  | 0 |  | 0 | 12,000 |  |
Preferred stock, dividend rate (as a percent) |  |  | 9.00% |  |  |  |  | 9.00% |  | 1.00% |
Preferred stock dividends |  |  |  | $ 0 | $ 0 | $ 0 | $ 195,000 | $ 195,000 | $ 1,022,000 | $ 120,000 |
Common stock, par value (in dollars per share) |  |  |  | $ 1 |  | $ 1 |  | $ 1 | $ 1 |  |
Proceeds from issuance of common stock |  |  |  |  |  | $ 1,079,979 | 37,591,479 | $ 37,852,113 | $ 803,957 |  |
Payments for redemption of preferred stock | $ 12,000,000 |  |  |  |  |  |  |  |  |  |
Payment of dividends on preferred stock | $ 195,000 |  |  |  |  | $ 0 | $ 195,000 | $ 195,000 | $ 752,000 |  |
SBLF Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  |  |  |  |  |  |  | 12,000 | 12,000
Share price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1,000 | $ 1,000
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in public offering (in shares) |  | 2,010,084 |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 1.00 |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | $ 33,200,000 |  |  |  |  |  |  |  |  |

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