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Document and Entity Information - shares
6 Months Ended
Jun. 30, 2021
Jul. 28, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-15373  
Entity Registrant Name ENTERPRISE FINANCIAL SERVICES CORP  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 43-1706259  
Entity Address, Address Line One 150 North Meramec  
Entity Address, City or Town Clayton  
Entity Address, State or Province MO  
Entity Address, Postal Zip Code 63105  
City Area Code 314  
Local Phone Number 725-5500  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol EFSC  
Security Exchange Name NASDAQ  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   38,624,599
Entity Central Index Key 0001025835  
Document Period End Date Jun. 30, 2021  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Amendment Flag false