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Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended
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May 01, 2018 | Apr. 27, 2018 | Nov. 01, 2017 | May 19, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Atlantic Capital Bank, N.A. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  | $ 1,183 |  |  |  |
Pro-forma revenue |  |  |  |  | $ 450 |  | $ 1,200 |
Pro-forma net income |  |  |  |  | 217 |  | 258 |
Goodwill |  |  |  | $ 660 |  |  |  |
Capstone Bancshares Inc. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration paid |  |  | $ 15,826 |  |  |  |  |
Pro-forma revenue |  |  |  |  | 6,600 |  | 21,100 |
Pro-forma net income |  |  |  |  | 3,400 |  | 9,800 |
Exchange of shares |  |  | 0.85 |  |  |  |  |
Cash payment per share (in dollars per share) |  |  | $ 18.50 |  |  |  |  |
Percentage of common stock consideration transferred |  |  | 80.00% |  |  |  |  |
Percentage of cash consideration transferred |  |  | 20.00% |  |  |  |  |
Voting interests acquired |  |  | 74.00% |  |  |  |  |
Goodwill |  |  | $ 38,058 |  |  |  |  |
Pro forma revenue, acquisition |  |  |  |  |  | $ 6,200 |  | $ 18,800
Pro forma net income (loss) |  |  |  |  |  | 237 |  | 710
Fair value adjustment |  |  |  |  | 11 |  |  |
Common stock issued (in shares) |  |  | 2,908,094 |  |  |  |  |
Market price of SMBK common stock (in dollars per share) |  |  | $ 23.49 |  |  |  |  |
Tennessee Bancshares [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration paid | $ 5 |  |  |  |  |  |  |
Pro-forma revenue |  |  |  |  | 3,200 |  | 5,500 |
Pro-forma net income |  |  |  |  | $ 1,100 |  | 1,900 |
Voting interests acquired | 89.00% |  |  |  |  |  |  |
Goodwill | $ 15,779 |  |  |  |  |  |  |
Pro forma revenue, acquisition |  |  |  |  |  | 3,700 |  | 11,000
Pro forma net income (loss) |  |  |  |  |  | $ 909 |  | $ 2,700
Common shares converted (in shares) | 0.8065 |  |  |  |  |  |  |
Common stock issued (in shares) | 1,458,981 |  |  |  |  |  |  |
Consecutive trading days |  | 10 days |  |  |  |  |  |
Market price of SMBK common stock (in dollars per share) | $ 23.85 |  |  |  |  |  |  |
Fair value adjustment |  |  |  |  |  |  | 51 |
Weighted Average [Member] | Tennessee Bancshares [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Market price of SMBK common stock (in dollars per share) |  | $ 23.92 |  |  |  |  |  |
Pro Forma [Member] | Capstone Bancshares Inc. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  | 4,600 |
Pro Forma [Member] | Tennessee Bancshares [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  | $ 2,000 |

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