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Deposits (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Deposits [Abstract] |
Scheduled Maturities Of Time Deposit | ​
​ | ​ | ​ | ​
2022 |  | $ | 409,656
2023 | ​ |  | 104,666
2024 | ​ |  | 32,988
2025 | ​ |  | 16,040
2026 | ​ |  | 10,592
Thereafter | ​ |  | —
Total | ​ | $ | 573,942

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- Definition Tabular disclosure of the scheduled maturities of time deposits during the period. + References No definition available. + Details
Name: | smbk_ScheduledMaturitiesOfTimeDepositTableTextBlock
Namespace Prefix: | smbk_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration