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Goodwill and Intangible Assets (FY) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortized intangible asset:    
Core deposit intangible, Gross Carrying Amount $ 8,589 $ 2,750
Core deposit intangible, Accumulated Amortization $ 626 $ 280