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Income Taxes (FY) (Details 1) - 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
Income Tax Disclosure [Abstract]            
Federal income tax expense computed at the statutory rate         $ 3,891,000 $ 3,115,000
State income taxes, net of federal tax benefit         491,000 393,000
Nondeductible acquisition expenses         364,000 0
Change in tax rate         2,440,000 0
Other         (757,000) (146,000)
Total income tax expense $ 1,294,707 $ 725,694 $ 2,235,162 $ 1,671,548 $ 6,428,791 $ 3,362,080