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Presentation of Financial Information (Q2) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Gross interchange and debit card transaction fees | $ 401,000 |  |  | $ 733,000 |  |
Network costs | 280,000 |  | $ 140,000 | 467,000 | $ 227,000 |
Interchange and debit card transaction fees | $ 121,219 |  | $ 223,329 | $ 266,754 | $ 415,722 |
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect |  | $ 197,000 |  |  |  | $ 0

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