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

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

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