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Derivatives Financial Instruments (Collateral Requirements) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Collateral pledged to derivative counterparties	$ 150	$ 390

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- 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