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Derivatives Financial Instruments - Collateral Requirements (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Collateral pledged to derivative counterparties | $ 910 | $ 1,400

X
- Definition Collateral pledged to derivative counterparties. + References No definition available. + Details
Name: | smbk_CollateralPledgedToDerivativeCounterparties
Namespace Prefix: | smbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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