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Portfolio Loans - Narrative (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Unadvanced Commitment on Impaired Loan |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Estimated losses attributable to unadvanced commitments on impaired loans | $ 0.4

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- Definition Loans and Leases Receivable, Impaired Loans, Commitment to Lend, Reserve + References No definition available. + Details
Name: | efsc_LoansAndLeasesReceivableImpairedLoansCommitmentToLendReserve
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | efsc_NatureOfCommitmentsAxis=efsc_UnadvancedCommitmentOnImpairedLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |