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Regulatory Matters (Regulatory Capital Levels) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
SmartFinancial, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 337,484	$ 329,431
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	279,747	271,739
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	279,747	271,739
Tier 1 Capital (to Average Assets), Actual Amount	$ 279,747	$ 271,739
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	13.62%	14.07%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	11.29%	11.61%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	11.29%	11.61%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	8.55%	8.70%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 198,250	$ 187,303
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	148,687	140,477
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	111,515	105,358
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 130,918	$ 125,002
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	$ 323,288	$ 317,660
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	304,918	299,314
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	304,918	299,314
Tier 1 Capital (to Average Assets), Actual Amount	$ 304,918	$ 299,314
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	13.05%	13.57%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	12.31%	12.78%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	12.31%	12.78%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	9.33%	9.58%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 198,174	$ 187,294
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	148,631	140,470
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	111,473	105,353
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 130,783	$ 124,969
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	$ 247,718	$ 234,117
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	198,174	187,294
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	161,017	152,176
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	$ 163,479	$ 156,212
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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