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Purchased Credit Impaired ("PCI") Loans - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
PCI loans outstanding	$ 151.1	$ 64.7

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- Definition

Loans Purchased From FDIC Outstanding Balance

+ References

No definition available.

+ Details

Name:	efsc_LoansPurchasedFromFdicOutstandingBalance
Namespace Prefix:	efsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration