Regulatory Matters (Regulatory Capital Levels) (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
SmartFinancial, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 448,050	$ 425,957
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	385,795	360,608
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	385,795	360,608
Tier 1 Capital (to Average Assets), Actual Amount	$ 385,795	$ 360,608
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1180	0.1140
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1016	0.0965
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent)	0.1016	0.0965
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	0.0827	0.0795
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 303,658	$ 298,966
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	227,744	224,224
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	170,808	168,168
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 186,672	$ 181,387
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	$ 456,134	$ 426,947
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	427,559	403,613
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	427,559	403,613
Tier 1 Capital (to Average Assets), Actual Amount	$ 427,559	$ 403,613
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1202	0.1144
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1126	0.1082
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent)	0.1126	0.1082
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	0.0918	0.0890
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 303,680	$ 298,476
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	227,760	223,857
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	170,820	167,892
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 186,363	$ 181,383
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	$ 379,600	$ 373,094
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	303,680	298,476
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	246,740	242,511
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	$ 232,954	$ 226,729
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