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v3.19.1

Subsequent Events (Details) $ in Millions | Apr. 23, 2019 USD ($)
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Subsequent Event [Member] | Entegra Financial Corp [Member] |
Subsequent Event [Line Items] |
Termination fee received | $ 6.4

X
- Definition Business Combination, Termination Fee Received + References No definition available. + Details
Name: | smbk_BusinessCombinationTerminationFeeReceived
Namespace Prefix: | smbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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

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

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