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Commitments and Contingent Liabilities (Details) $ in Millions	Sep. 30, 2015 USD ($)
Commitments to extend credit	$ 116.1
Standby letters of credit	$ 2.9

X

- Definition

Contractual amount for all off-balance sheet commitments.

+ References

No definition available.

+ Details

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

X

- Definition

Unused amount of commitments to extend credit to customers.

+ References

No definition available.

+ Details

Name:	us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant