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Regulatory Matters (Regulatory Capital Levels) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
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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Common equity Tier 1 Risk Based Capital as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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