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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Q2) (Parenthetical) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
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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 gains arising during the period, tax expense (benefit) | $ (134,439) | $ 270,461 | $ (580,433) | $ 468,293 | $ (55,405) | $ 326,697
Reclassification adjustment for losses included in net income, tax expense | $ (280) | $ 0 | $ (280) | $ 0 | $ 54,533 | $ 76,422

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