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Income Taxes (FY) (Details) - 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
Current tax expense |  |  |  |  |  |
Federal |  |  |  |  | $ 1,962,000 | $ 2,503,000
State |  |  |  |  | 428,000 | 531,000
Deferred tax expense (benefit) related to: |  |  |  |  |  |
Provision for loan losses |  |  |  |  | (355,000) | (320,000)
Depreciation |  |  |  |  | 374,000 | 203,000
Fair value adjustments |  |  |  |  | 1,611,000 | 356,000
Nonaccrual interest |  |  |  |  | (26,000) | (26,000)
Foreclosed real estate |  |  |  |  | 55,000 | 117,000
Core deposit intangible |  |  |  |  | (123,000) | (117,000)
Other |  |  |  |  | 63,000 | 115,000
Change in tax rate |  |  |  |  | 2,440,000 | 0
Total income tax expense | $ 1,294,707 | $ 725,694 | $ 2,235,162 | $ 1,671,548 | $ 6,428,791 | $ 3,362,080

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