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v3.20.1

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) | 12 Months Ended
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Dec. 31, 2019 $ / shares
Statement of Stockholders' Equity [Abstract] |
Common stock dividends (in dollars per share) | $ 0.05

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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
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration