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Regulatory Matters (Regulatory Capital Levels) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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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 | $ 315,306 | $ 287,937
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 259,748 | 238,433
Common Equity Tier 1 Capital (to Risk-Weighted Assets, Actual Amount | 259,748 | 238,433
Tier 1 Capital (to Average Assets, Actual Amount | $ 259,748 | $ 238,433
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 13.25% | 14.02%
Tier 1 Capital (to Risk-Weighted Assets, Actual Ratio (as a percent) | 10.92% | 11.61%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 10.92% | 11.61%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) | 8.83% | 10.34%
Total Capital (to risk-Weighted Assets), Minimum capital adequacy purposes amount | $ 190,305 | $ 164,313
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes, amount | 142,729 | 123,235
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes, amount | 107,047 | 92,426
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes, amount | $ 117,636 | $ 92,258
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 | $ 304,993 | $ 273,432
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 288,739 | 263,189
Common Equity Tier 1 Capital (to Risk-Weighted Assets, Actual Amount | 288,739 | 263,189
Tier 1 Capital (to Average Assets, Actual Amount | $ 288,739 | $ 263,189
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.82% | 13.31%
Tier 1 Capital (to Risk-Weighted Assets, Actual Ratio (as a percent) | 12.14% | 12.81%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.14% | 12.81%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) | 9.82% | 11.41%
Total Capital (to risk-Weighted Assets), Minimum capital adequacy purposes amount | $ 190,259 | $ 164,305
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes, amount | 142,694 | 123,229
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes, amount | 107,021 | 92,422
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes, amount | $ 117,619 | $ 92,254
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 | $ 237,824 | $ 205,382
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions, amount | 190,259 | 164,305
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions, amount | 154,586 | 133,498
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions, amount | $ 147,024 | $ 115,317
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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