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Purchase Credit Impaired ("PCI") Loans - Summary of FDIC Loss Share Receivable (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
FDIC Indemnification Asset [Roll Forward] |  |
Cash received from the FDIC for covered assets | $ 0 | $ (1,574)

X
- Definition Net cash proceeds received from FDIC loss share receivable + References No definition available. + Details
Name: | efsc_NetCashProceedsReceivedFromFdicLossShareReceivable
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration