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Regulatory Matters (Regulatory Capital Levels) (Details) - USD ($) $ in Thousands	Sep. 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	$ 323,297	$ 287,937
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	265,155	238,433
Common Equity Tier 1 Capital (to Risk-Weighted Assets, Actual Amount	265,155	238,433
Tier 1 Capital (to Average Assets, Actual Amount	$ 265,155	$ 238,433
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	13.81%	14.02%
Tier 1 Capital (to Risk-Weighted Assets, Actual Ratio (as a percent)	11.33%	11.61%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	11.33%	11.61%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	8.78%	10.34%
Total Capital (to risk-Weighted Assets), Minimum capital adequacy purposes amount	$ 187,225	$ 164,313
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes, amount	140,419	123,235
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes, amount	105,314	92,426
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes, amount	$ 120,766	$ 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	$ 312,869	$ 273,432
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	294,052	263,189
Common Equity Tier 1 Capital (to Risk-Weighted Assets, Actual Amount	294,052	263,189
Tier 1 Capital (to Average Assets, Actual Amount	$ 294,052	$ 263,189
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	13.37%	13.31%
Tier 1 Capital (to Risk-Weighted Assets, Actual Ratio (as a percent)	12.57%	12.81%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	12.57%	12.81%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	9.74%	11.41%
Total Capital (to risk-Weighted Assets), Minimum capital adequacy purposes amount	$ 187,217	$ 164,305
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes, amount	140,413	123,229
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes, amount	105,310	92,422
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes, amount	$ 120,762	$ 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	$ 234,022	$ 205,382
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions, amount	187,217	164,305
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions, amount	152,114	133,498
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions, amount	$ 150,953	$ 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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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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