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Purchased Credit Impaired ("PCI") Loans - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Receivables [Abstract] |  |
PCI loans outstanding | $ 107.8 | $ 54.6

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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