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Regulatory Matters (FY) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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%

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