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New Authoritative Accounting Guidance - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
New Accounting Pronouncement, Early Adoption [Line Items]
Reclassification of additional paid in capital to retained earnings	$ 5

X

- Definition

Reclassification of additional paid in capital to retained earnings

+ References

No definition available.

+ Details

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Namespace Prefix:	efsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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