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Fair Value of Assets and Liabilities (FY) (Details 3) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Assets: |  |  |
Securities available-for-sale |  | $ 151,944,000 | $ 129,422,000
Carrying Value [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | $ 170,235,000 | 113,027,000 | 68,748,000
Securities available-for-sale |  |  | 129,422,000
Restricted investments |  | 6,431,000 | 5,628,000
Loans, net | 1,568,361,000 | 1,317,398,000 | 808,271,000
Liabilities: |  |  |
Noninterest-bearing demand deposits |  | 220,520,000 | 153,483,000
Interest-bearing demand deposits |  | 231,644,000 | 162,702,000
Savings deposits | 632,518,000 | 543,645,000 | 274,605,000
Time deposits |  | 442,774,000 | 316,275,000
Securities sold under agreements to repurchase | 18,635,000 | 24,055,000 | 26,622,000
Federal Home Loan Bank advances and other borrowings |  | 43,600,000 | 18,505,000
Estimated Fair Value [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | 170,235,000 | 113,027,000 | 68,748,000
Securities available-for-sale |  | 151,944,000 | 129,422,000
Loans, net | 1,569,916,000 | 1,292,303,000 | 803,057,000
Liabilities: |  |  |
Noninterest-bearing demand deposits |  | 220,520,000 | 153,483,000
Interest-bearing demand deposits |  | 231,644,000 | 162,702,000
Savings deposits | 632,518,000 | 543,645,000 | 274,605,000
Time deposits |  | 443,547,000 | 316,734,000
Securities sold under agreements to repurchase | $ 18,635,000 | 24,055,000 | 26,622,000
Federal Home Loan Bank advances and other borrowings |  | $ 43,600,000 | $ 18,505,000

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