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Regulatory Matters (Regulatory Capital Levels) (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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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

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