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Regulatory Matters (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Enterprise Financial Services Corp [Member] |  |
Total Capital (to Risk Weighted Assets) [Abstract] |  |
Actual, Ratio | 14.90% | 12.90%
Tier 1 Capital (to Risk Weighted Assets) [Abstract] |  |
Actual, Ratio | 12.10% | 11.40%
Tier One Common Equity Capital to Risk Weighted Assets | 10.90% | 9.90%
Tier 1 Capital (to Average Assets) [Abstract] |  |
Actual, Ratio | 10.00% | 10.10%
Enterprise Bank and Trust [Member] |  |
Total Capital (to Risk Weighted Assets) [Abstract] |  |
Actual, Ratio | 13.70% | 12.40%
To Be Well Capitalized Under Applicable Action Provisions, Ratio | 10.00% |
Capital to Risk Weighted Assets CCB Minimum | 10.50% |
Tier 1 Capital (to Risk Weighted Assets) [Abstract] |  |
Actual, Ratio | 12.50% | 11.70%
To Be Well Capitalized Under Applicable Action Provisions, Ratio | 8.00% |
Tier One Risk Based Capital CCB Minimum | 8.50% |
Tier One Common Equity Capital to Risk Weighted Assets | 12.50% | 11.70%
Tier One Common Equity Capital Required to be Well Capitalized to Risk Weighted Assets | 6.50% |
Tier One Common Equity Capital CCB Minimum | 7.00% |
Tier 1 Capital (to Average Assets) [Abstract] |  |
Actual, Ratio | 10.30% | 10.30%
To Be Well Capitalized Under Applicable Action Provisions, Ratio | 5.00% |
Tier One Leverage Capital to Average Assets CCB Minimum | 4.00% |

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