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Consolidated Statements of Comprehensive Income (FY) (Parenthetical) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |
Unrealized holding losses arising during the year, tax benefit | $ 134,439 | $ (270,461) | $ 580,433 | $ (468,293) | $ 55,405 | $ (326,697)
Reclassification adjustment for gains included in net income, tax expense | $ (280) | $ 0 | $ (280) | $ 0 | $ 54,533 | $ 76,422

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