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Subsequent Events - Narrative (Details) | May 01, 2018 shares
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Tennessee Bancshares [Member] | Common Stock [Member] | Subsequent Event [Member] |
Subsequent Event [Line Items] |
Common shares converted (in shares) | 0.8065

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- Definition Business Combination, Shares Issued Upon Conversion + References No definition available. + Details
Name: | smbk_BusinessCombinationSharesIssuedUponConversion
Namespace Prefix: | smbk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=smbk_TennesseeBancsharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |