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Document and Entity Information Document - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Feb. 24, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 001-15373    
Entity Registrant Name ENTERPRISE FINANCIAL SERVICES CORP    
Entity Central Index Key 0001025835    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 43-1706259    
Entity Address, Address Line One 150 North Meramec Avenue    
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    
Title of 12(b) Security Common Stock, par value $.01 per share    
Trading Symbol EFSC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,535,891
Entity Common Stock, Shares Outstanding   37,821,174  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE

Portions of our Annual Report on Form 10-K for the fiscal year ended December 31, 2020 are incorporated by reference into Item 7 of this Annual Report on Form 10-K. Additionally, the information required by Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K is incorporated by reference to the Registrant’s Definitive Proxy Statement for its 2022 Annual Meeting of Shareholders, which will be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended.
    
ICFR Auditor Attestation Flag true