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Deposits (Details Textual) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Time Deposits Maturity [Line Items]
Time deposits of 250,000 or more	$ 171,529,000	$ 123,053,000
Fair value adjustments to time deposits	1,092,456	303,981
Deposit liabilities reclassified as loans receivable	155,000	76,380
Related Party [Member]
Time Deposits Maturity [Line Items]
Related party deposit liabilities	$ 16,700,000	$ 15,100,000

X

- Definition

Amount of fair value adjustments to time deposits as a result of the business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	smbk_
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Balance Type:	debit
Period Type:	instant

X

- Definition

The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more.

+ References

No definition available.

+ Details

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Namespace Prefix:	smbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	smbk_
Data Type:	xbrli:stringItemType
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X

- Definition

Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of deposits held by the entity for a related party (entity, shareholder, employee).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Details

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