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Regulatory Matters (Regulatory Capital Levels) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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 | $ 287,937 | $ 257,545
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 238,433 | 210,093
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 238,433 | 210,093
Tier 1 Capital (to Average Assets), Actual Amount | $ 238,433 | $ 210,093
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 14.02% | 13.47%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 11.61% | 10.99%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 11.61% | 10.99%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) | 10.34% | 9.91%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | $ 164,313 | $ 152,971
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 123,235 | 114,728
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 92,426 | 86,046
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount | $ 92,258 | $ 84,821
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 | $ 273,432 | $ 243,774
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 263,189 | 235,499
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 263,189 | 235,499
Tier 1 Capital (to Average Assets), Actual Amount | $ 263,189 | $ 235,499
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 13.31% | 12.74%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.81% | 12.31%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.81% | 12.31%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) | 11.41% | 11.17%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | $ 164,305 | $ 153,017
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 123,229 | 114,763
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 92,422 | 86,072
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount | $ 92,254 | $ 84,300
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 | $ 205,382 | $ 191,271
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | 164,305 | 153,017
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | 133,498 | 124,326
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | $ 115,317 | $ 105,375
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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