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Presentation of Financial Information (Details) $ in Millions	Mar. 31, 2020 USD ($)
COVID-19 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification, amount	$ 70.1

X

- Definition

Financing Receivable, Modifications, Amount

+ References

No definition available.

+ Details

Name:	smbk_FinancingReceivableModificationsAmount
Namespace Prefix:	smbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

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- Details

Name:	us-gaap_LoanRestructuringModificationNameAxis=smbk_COVID19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: