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Regulatory Matters (Details)	Dec. 31, 2020	Dec. 31, 2019
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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Capital to Risk Weighted Assets CCB Minimum

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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