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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2020
Statement of Stockholders' Equity [Abstract] |  |  |
Common stock dividend (in dollars per share) | $ (0.05) | $ 0.05 | $ (0.10)

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- Definition Common Stock Dividends, Per Share + References No definition available. + Details
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Namespace Prefix: | smbk_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration