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Regulatory Matters (Regulatory Capital Levels) (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
SmartFinancial, Inc.    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets), Actual Amount $ 614,298 $ 470,635
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 454,671 413,616
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 454,671 413,616
Tier 1 Capital (to Average Assets), Actual Amount $ 454,671 $ 413,616
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 0.1331 0.111
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 0.0985 0.0976
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent) 0.0985 0.0976
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 0.0821 0.0829
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount $ 369,144 $ 339,044
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 276,858 254,283
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 207,644 190,712
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount $ 221,619 $ 199,585
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 0.08 0.08
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 0.06 0.06
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 0.045 0.045
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent) 0.04 0.04
Smart Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets), Actual Amount $ 567,837 $ 478,368
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 530,814 445,159
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 530,814 445,159
Tier 1 Capital (to Average Assets), Actual Amount $ 530,814 $ 445,159
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 0.1237 0.113
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 0.1156 0.1051
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent) 0.1156 0.1051
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 0.0959 0.0894
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount $ 367,372 $ 338,774
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 275,529 254,080
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 206,647 190,560
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount $ 221,414 $ 199,214
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 0.08 0.08
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 0.06 0.06
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 0.045 0.045
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent) 0.04 0.04
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount $ 459,215 $ 423,467
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount 367,372 338,774
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount 298,490 275,253
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount $ 276,767 $ 249,017
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) 0.10 0.10
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) 0.08 0.08
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) 0.065 0.065
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) 0.05 0.05