v3.26.1
Regulatory Matters (Regulatory Capital Levels) (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
SmartFinancial, Inc.    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets), Actual Amount $ 623,251 $ 606,158
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 478,573 468,641
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 478,573 468,641
Tier 1 Capital (to Average Assets), Actual Amount $ 478,573 $ 468,641
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 0.1272 0.1271
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 0.0977 0.0983
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent) 0.0977 0.0983
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 0.0841 0.083
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount $ 391,885 $ 381,470
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 293,914 286,103
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 220,435 214,577
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount $ 227,508 $ 225,852
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 $ 606,998 $ 586,675
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 561,053 547,820
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 561,053 547,820
Tier 1 Capital (to Average Assets), Actual Amount $ 561,053 $ 547,820
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 0.1241 0.1232
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 0.1147 0.1151
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ration (as percent) 0.1147 0.1151
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 0.0988 0.0971
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount $ 391,292 $ 380,891
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 293,469 285,668
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 220,102 214,251
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount $ 227,216 $ 225,566
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 $ 489,115 $ 476,114
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount 391,292 380,891
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount 317,925 309,474
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount $ 284,020 $ 281,957
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