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Regulatory Matters (Regulatory Capital Levels) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
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%