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Regulatory Matters (Regulatory Capital Levels) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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 |  | $ 163,683
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount |  | 157,823
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount |  | 157,823
Tier 1 Capital (to Average Assets), Actual Amount |  | $ 157,823
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) |  | 10.98%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) |  | 10.59%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) |  | 10.59%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) |  | 10.78%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount |  | $ 119,257
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount |  | 89,442
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount |  | 67,082
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount |  | $ 58,562
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) |  | 8.00%
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) |  | 6.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) |  | 4.50%
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent) |  | 4.00%
Smart Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual Amount | $ 243,774 | $ 168,148
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 235,499 | 162,288
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount | 235,499 | 162,288
Tier 1 Capital (to Average Assets), Actual Amount | $ 235,499 | $ 162,288
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.74% | 11.29%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.31% | 10.90%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) | 12.31% | 10.90%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) | 11.17% | 11.26%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | $ 153,017 | $ 119,111
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 114,763 | 89,333
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount | 86,072 | 67,000
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount | $ 84,300 | $ 57,656
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 | $ 191,271 | $ 148,889
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | 153,017 | 119,111
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | 124,326 | 96,778
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount | $ 105,375 | $ 72,070
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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