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Business Combination (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Business Combination Exchange of Shares	1.05
Equity Method Investment, Ownership Percentage	56.00%
Business Acquisition Pro Forma Nonrecurring Costs	$ 1,027	$ 0

X

- Definition

Business acquisition pro forma nonrecurring costs.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Business combination exchange of shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	smbk_
Data Type:	xbrli:sharesItemType
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Period Type:	instant

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 323



-SubTopic 10



-Section 50



-Paragraph 3



-Subparagraph (a)(1)



-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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