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Goodwill and Intangible Assets (FY) (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill | The following table presents information about our core deposit premium intangible asset at December 31 (in thousands):
|  | 2017 |  | 2016
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Amortized intangible asset: |  |  |  |  |  |  |  |  |  |  |  |
Core deposit intangible |  | $ | 8,589 |  |  | $ | 626 |  |  | $ | 2,750 |  |  | $ | 280 |
Finite-lived Intangible Assets Amortization Expense | The following table presents information about aggregate amortization expense for 2017 and 2016 and for the succeeding fiscal years as follows (in thousands):
|  | 2017 |  | 2016
Aggregate amortization expense of core deposit premium intangible |  | $ | 346 |  |  | $ | 305 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Estimated aggregate amortization expense of the core deposit premium intangible for the year ending December 31 (in thousands):
2018 | $ | 772 |
2019 | 772 |
2020 | 717 |
2021 | 670 |
2022 | 670 |
Thereafter | 4,362 |
Total | $ | 7,963 |

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