Regulatory Matters (Regulatory Capital Levels) (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
SmartFinancial, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 425,957	$ 386,627
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	360,608	325,345
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	360,608	325,345
Tier 1 Capital (to Average Assets), Actual Amount	$ 360,608	$ 325,345
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1140	0.1255
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.0965	0.1056
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent)	0.0965	0.1056
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	0.0795	0.0745
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 298,966	$ 246,483
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	224,224	184,862
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	168,168	138,647
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 181,387	$ 174,578
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	0.0800	0.0800
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	0.0600	0.0600
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	0.0450	0.0450
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent)	0.0400	0.0400
Smart Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 426,947	$ 378,055
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	403,613	358,703
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	403,613	358,703
Tier 1 Capital (to Average Assets), Actual Amount	$ 403,613	$ 358,703
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1144	0.1229
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1082	0.1166
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent)	0.1082	0.1166
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	0.0890	0.0823
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 298,476	$ 246,053
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	223,857	184,539
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	167,892	138,405
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 181,383	$ 174,384
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	0.0800	0.0800
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	0.0600	0.0600
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	0.0450	0.0450
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent)	0.0400	0.0400
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	$ 373,094	$ 307,566
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	298,476	246,053
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	242,511	199,918
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	$ 226,729	$ 217,980
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent)	0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent)	0.0800	0.0800
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent)	0.0650	0.0650
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent)	0.0500	0.0500