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Business Combinations (Allocation of Purchase Price of Foothills Bancorp) (Details) - USD ($) $ / shares in Units, $ in Thousands | Nov. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair value of assets acquired and liabilities assumed: |  |  |
Goodwill |  | $ 65,600 | $ 66,100
Foothills Bancorp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Shares of SMBK common stock issued (in shares) | 1,183,232 |  |
Market price of SMBK common stock (in dollars per share) | $ 20.34 |  |
Estimated fair value of SMBK common stock issued | $ 24,067 |  |
Cash consideration paid | 6,069 |  |
Total consideration | 30,136 |  |
Fair value of assets acquired and liabilities assumed: |  |  |
Cash and cash equivalents | 4,882 |  |
Investment securities available-for-sale | 48,091 |  |
Restricted investments | 551 |  |
Loans | 153,692 |  |
Premises and equipment | 3,622 |  |
Core deposit intangible | 3,670 |  |
Prepaid and other assets | 3,944 |  |
Deposits | (185,259) |  |
FHLB advances and other borrowings | (10,257) |  |
Payables and other liabilities | (276) |  |
Total fair value of net assets acquired | 22,660 |  |
Goodwill | $ 7,476 |  |

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