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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SmartFinancial, Inc. [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets), Actual Amount $ 163,683 $ 105,756
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 157,823 100,651
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 157,823 88,651
Tier 1 Capital (to Average Assets), Actual Amount $ 157,823 $ 100,651
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 10.98% 11.99%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 10.59% 11.42%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 10.59% 10.05%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 10.78% 9.81%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount $ 119,257 $ 70,553
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 89,442 52,915
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 67,082 39,686
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount $ 58,562 $ 41,052
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 8.00% 8.00%
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 6.00% 6.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 4.50% 4.50%
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent) 4.00% 4.00%
Smart Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets), Actual Amount $ 168,148 $ 104,705
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 162,288 99,600
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount 162,288 99,600
Tier 1 Capital (to Average Assets), Actual Amount $ 162,288 $ 99,600
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 11.29% 11.88%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 10.90% 11.30%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) 10.90% 11.30%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 11.26% 9.71%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount $ 119,111 $ 70,535
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 89,333 52,901
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount 67,000 39,676
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount $ 57,656 $ 41,041
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 8.00% 8.00%
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 6.00% 6.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) 4.50% 4.50%
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent) 4.00% 4.00%
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount $ 148,889 $ 88,169
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount 119,111 70,535
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount 96,778 57,310
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount $ 72,070 $ 51,301
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) 10.00% 10.00%
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) 8.00% 8.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) 6.50% 6.50%
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) 5.00% 5.00%