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Regulatory Capital (Details)
Dec. 31, 2024
Dec. 31, 2023
Enterprise Financial Services Corp [Member]    
Regulatory Assets [Line Items]    
Tier One Common Equity Capital to Risk Weighted Assets 11.80% 11.30%
Actual, Ratio 0.131 0.127
Actual, Ratio 0.146 0.142
Actual, Ratio 0.111 0.110
Enterprise Bank and Trust [Member]    
Regulatory Assets [Line Items]    
Tier One Common Equity Capital to Risk Weighted Assets 12.40% 12.20%
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 0.124 0.122
To Be Well Capitalized Under Applicable Action Provisions, Ratio 0.080  
Tier One Risk Based Capital CCB Minimum 8.50%  
Actual, Ratio 0.134 0.132
To Be Well Capitalized Under Applicable Action Provisions, Ratio 0.100  
Capital to Risk Weighted Assets CCB Minimum 10.50%  
Actual, Ratio 0.105 0.106
To Be Well Capitalized Under Applicable Action Provisions, Ratio 0.050