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Subsequent Events (Q2) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 27, 2018	Jun. 26, 2018	May 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Common Stock, Shares, Outstanding	12,704,581				11,152,561	5,896,033
Foothills Bancorp [Member]
Subsequent Event [Line Items]
Cash paid upon conversion (in dollars per share)		$ 1.75
Common shares converted (in shares)		0.666
Common Stock, Shares, Outstanding			1,776,925
Termination fee	$ 1,450,000
Tennessee Bancshares [Member]
Subsequent Event [Line Items]
Common shares converted (in shares)				0.8065

X

- Definition

Business Combination, Cash Paid Upon Conversion

+ References

No definition available.

+ Details

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

X

- Definition

Business Combination, Shares Issued Upon Conversion

+ References

No definition available.

+ Details

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Namespace Prefix:	smbk_
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X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

The amount of the loss on termination of a contract for default.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=115993466&loc=d3e52595-109384

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Details

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Namespace Prefix:
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X

- Details

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