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Business Combination Business Combination (Allocation of Purchase Price) (FY) (Details) - USD ($) | Nov. 01, 2017 | May 19, 2017 | Aug. 31, 2015
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Total consideration in cash | $ 15,826,000 |  |
Fair value of assets acquired and liabilities assumed: |  |  |
Cash and cash equivalents | 16,810,000 |  |
Premises and equipment | 8,668,000 |  |
Prepaid and other assets | 6,360,000 |  |
Total fair value of net assets acquired | 47,675,000 |  |
Goodwill | $ 38,047,000 |  | $ 42,873,689
Atlantic Capital Bank, N.A. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration in cash |  | $ 1,183,007 |
Fair value of assets acquired and liabilities assumed: |  |  |
Cash and cash equivalents |  | 133,000 |
Loans |  | 24,073,000 |
Premises and equipment |  | 2,839,000 |
Core deposit intangible |  | 310,000 |
Prepaid and other assets |  | 77,000 |
Deposits |  | (26,888,000) |
Payables and other liabilities |  | (21,000) |
Total fair value of net assets acquired |  | 523,000 |
Goodwill |  | $ 660,000 |

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