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Business Combination - Tennessee Bancshares Merger (Q2) (Details) - USD ($) | May 01, 2018 | Nov. 01, 2017 | Aug. 31, 2015
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Business Acquisition [Line Items] |  |  |
Cash consideration paid |  | $ 15,826,000 |
Total consideration |  | 85,722,000 |
Fair value of assets acquired and liabilities assumed: |  |  |
Cash and cash equivalents |  | 16,810,000 |
Investment securities available for sale |  | 51,638,000 |
Restricted investments |  | 1,049,000 |
Loans |  | 413,023,000 |
Premises and equipment |  | 8,668,000 |
Core deposit intangible |  | 5,530,000 |
Other real estate owned |  | 410,000 |
Prepaid and other assets |  | 6,360,000 |
Deposits |  | (454,154,000) |
Payables and other liabilities |  | (6,803,000) |
Total fair value of net assets acquired |  | 47,675,000 |
Goodwill |  | $ 38,047,000 | $ 42,873,689
Tennessee Bancshares [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Shares of SMBK common stock issued to TN Bancshares shareholders as of May 1, 2018 (in shares) | 1,458,981 |  |
Market price of SMBK common stock on May 1, 2018 (in dollars per share) | $ 23.85 |  |
Estimated fair value of SMBK common stock issued (in shares) | $ 34,797,000 |  |
Cash consideration paid | 5,000 |  |
Total consideration | 34,802,000 |  |
Fair value of assets acquired and liabilities assumed: |  |  |
Cash and cash equivalents | 5,723,000 |  |
Investment securities available for sale | 24,563,000 |  |
Restricted investments | 464,000 |  |
Loans | 180,490,000 |  |
Premises and equipment | 9,470,000 |  |
Core deposit intangible | 2,290,000 |  |
Other real estate owned | 674,000 |  |
Prepaid and other assets | 2,258,000 |  |
Deposits | (202,272,000) |  |
FHLB advances and other borrowings | (4,000,000) |  |
Payables and other liabilities | (586,000) |  |
Total fair value of net assets acquired | 19,074,000 |  |
Goodwill | $ 15,728,000 |  |

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