Regulatory Matters (Regulatory Capital Levels) (Details) $ in Thousands	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
SmartFinancial, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 461,718	$ 448,050
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	397,641	385,795
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	397,641	385,795
Tier 1 Capital (to Average Assets), Actual Amount	$ 397,641	$ 385,795
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1168	0.1180
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1006	0.1016
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent)	0.1006	0.1016
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	0.0832	0.0827
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 316,289	$ 303,658
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	237,217	227,744
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	177,913	170,808
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 191,120	$ 186,672
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	$ 465,013	$ 456,134
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	434,650	427,559
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	434,650	427,559
Tier 1 Capital (to Average Assets), Actual Amount	$ 434,650	$ 427,559
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1179	0.1202
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	0.1102	0.1126
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent)	0.1102	0.1126
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	0.0911	0.0918
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 315,575	$ 303,680
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	236,681	227,760
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	177,511	170,820
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 190,778	$ 186,363
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	$ 394,469	$ 379,600
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	315,575	303,680
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	256,405	246,740
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	$ 238,472	$ 232,954
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