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Regulatory Matters (Regulatory Capital Levels) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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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 | $ 337,484 | $ 329,431
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 279,747 | 271,739
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 279,747 | 271,739
Tier 1 Capital (to Average Assets), Actual Amount | $ 279,747 | $ 271,739
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 13.62% | 14.07%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 11.29% | 11.61%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 11.29% | 11.61%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) | 8.55% | 8.70%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | $ 198,250 | $ 187,303
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 148,687 | 140,477
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 111,515 | 105,358
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount | $ 130,918 | $ 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 | $ 323,288 | $ 317,660
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 304,918 | 299,314
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 304,918 | 299,314
Tier 1 Capital (to Average Assets), Actual Amount | $ 304,918 | $ 299,314
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 13.05% | 13.57%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.31% | 12.78%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.31% | 12.78%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) | 9.33% | 9.58%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | $ 198,174 | $ 187,294
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 148,631 | 140,470
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 111,473 | 105,353
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount | $ 130,783 | $ 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 | $ 247,718 | $ 234,117
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | 198,174 | 187,294
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | 161,017 | 152,176
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | $ 163,479 | $ 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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