Document and Entity Information Document	9 Months Ended
	Sep. 30, 2011	Nov. 04, 2011
Entity Information [Line Items]
Entity Registrant Name	ENTERPRISE FINANCIAL SERVICES CORP
Entity Central Index Key	0001025835
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Amendment Flag	true
Amendment Description	Amendment to Form 10-Q
Entity Common Stock, Shares Outstanding		17,749,550