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Regulatory Matters (Regulatory Capital Levels) (Details) $ in Thousands | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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SmartFinancial, Inc. [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual Amount | $ 381,766 | $ 329,431
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 320,562 | 271,739
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 320,562 | 271,739
Tier 1 Capital (to Average Assets), Actual Amount | $ 320,562 | $ 271,739
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.92 | 14.07
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 10.85 | 11.61
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 10.85% | 11.61%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) | 8.36 | 8.70
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | $ 236,367 | $ 187,303
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 177,275 | 140,477
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 132,956 | 105,358
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount | $ 153,417 | $ 125,002
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) | 8.00 | 8.00
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) | 6.00 | 6.00
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) | 4.50% | 4.50%
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent) | 4.00 | 4.00
Smart Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual Amount | $ 371,740 | $ 317,660
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 352,445 | 299,314
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 352,445 | 299,314
Tier 1 Capital (to Average Assets), Actual Amount | $ 352,445 | $ 299,314
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.59 | 13.57
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 11.94 | 12.78
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 11.94% | 12.78%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) | 9.20 | 9.58
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | $ 236,244 | $ 187,294
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 177,183 | 140,470
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 132,887 | 105,353
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount | $ 153,185 | $ 124,969
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) | 8.00 | 8.00
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) | 6.00 | 6.00
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) | 4.50% | 4.50%
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent) | 4.00 | 4.00
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | $ 295,304 | $ 234,117
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | 236,244 | 187,294
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | 191,948 | 152,176
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | $ 191,481 | $ 156,212
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) | 10.00 | 10.00
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) | 8.00 | 8.00
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) | 6.50% | 6.50%
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) | 5.00 | 5.00

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