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Subsequent Events (Details) - Subsequent Event [Member] - USD ($) | May 03, 2021 | Apr. 14, 2021 | Apr. 13, 2021
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Sevier County Bancshares Inc [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Common shares to be converted (in shares) |  | 0.4116 |
Number of consecutive trading days |  | 10 days |
Number of business days prior to closing date |  | 5 days |
Market price of SMBK common stock |  |  | $ 21.25
Cash to be paid upon conversion (in dollars per share) |  | $ 8.75 |
Total consideration |  | $ 38,200,000 |
Sevier County Bancshares Inc [Member] | Minimum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of shares owned by each shareholder (in shares) |  | 20,000 |
Stockholder's equity |  | $ 30,326,000 |
Sevier County Bancshares Inc [Member] | Maximum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of shares owned by each shareholder (in shares) |  | 20,000 |
Stockholder's equity |  | $ 30,326,000 |
Fountain Leasing LLC [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Cash consideration paid | $ 14,000,000 |  |
Liabilities amount repaid | 45,000,000 |  |
Fountain Leasing LLC [Member] | Maximum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Future cash payments of performance-based earnout | $ 6,000,000 |  |

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