Regulatory Matters (Details)	Dec. 31, 2022	Dec. 31, 2021
Enterprise Financial Services Corp [Member]
Regulatory Assets [Line Items]
Tier One Common Equity Capital to Risk Weighted Assets	11.10%	11.30%
Actual, Ratio	0.126	0.130
Actual, Ratio	0.142	0.147
Actual, Ratio	0.109	0.097
Enterprise Bank and Trust [Member]
Regulatory Assets [Line Items]
Tier One Common Equity Capital to Risk Weighted Assets	12.10%	12.50%
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	0.121	0.125
To Be Well Capitalized Under Applicable Action Provisions, Ratio	0.080
Tier One Risk Based Capital CCB Minimum	8.50%
Actual, Ratio	0.131	0.135
To Be Well Capitalized Under Applicable Action Provisions, Ratio	0.100
Capital to Risk Weighted Assets CCB Minimum	10.50%
Actual, Ratio	0.105	0.093
To Be Well Capitalized Under Applicable Action Provisions, Ratio	0.050
Tier One Leverage Capital to Average Assets CCB Minimum	4.00%