Regulatory Capital (Details)	Dec. 31, 2023	Dec. 31, 2022
Enterprise Financial Services Corp [Member]
Regulatory Assets [Line Items]
Tier One Common Equity Capital to Risk Weighted Assets	11.30%	11.10%
Actual, Ratio	0.127	0.126
Actual, Ratio	0.142	0.142
Actual, Ratio	0.110	0.109
Enterprise Bank and Trust [Member]
Regulatory Assets [Line Items]
Tier One Common Equity Capital to Risk Weighted Assets	12.20%	12.10%
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%
Actual, Ratio	0.122	0.121
To Be Well Capitalized Under Applicable Action Provisions, Ratio	0.080
Tier One Risk Based Capital CCB Minimum	8.50%
Actual, Ratio	0.132	0.131
To Be Well Capitalized Under Applicable Action Provisions, Ratio	0.100
Capital to Risk Weighted Assets CCB Minimum	10.50%
Actual, Ratio	0.106	0.105
To Be Well Capitalized Under Applicable Action Provisions, Ratio	0.050