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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 |  |

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- Definition Business Combination, Cash Paid Upon Conversion + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Business Combination, Shares Issued Upon Conversion + References No definition available. + Details
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Namespace Prefix: | smbk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- 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 + Details
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- 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 + Details
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- 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. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |