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Regulatory Capital (Details)
Dec. 31, 2025
Dec. 31, 2024
Enterprise Financial Services Corp [Member]    
Regulatory Assets [Line Items]    
Tier One Common Equity Capital to Risk Weighted Assets 11.60% 11.80%
Actual, Ratio 0.128 0.131
Actual, Ratio 0.139 0.146
Actual, Ratio 0.105 0.111
Enterprise Bank and Trust [Member]    
Regulatory Assets [Line Items]    
Tier One Common Equity Capital to Risk Weighted Assets 11.90% 12.40%
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 0.119 0.124
To Be Well Capitalized Under Applicable Action Provisions, Ratio 0.080  
Tier One Risk Based Capital CCB Minimum 8.50%  
Actual, Ratio 0.130 0.134
To Be Well Capitalized Under Applicable Action Provisions, Ratio 0.100  
Capital to Risk Weighted Assets CCB Minimum 10.50%  
Actual, Ratio 0.097 0.105
To Be Well Capitalized Under Applicable Action Provisions, Ratio 0.050