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Portfolio Loans - Narrative (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Number of loans over 90 days past due and still accruing interest 0efsc_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruingNumberOfLoans
Unadvanced commitments on impaired loans $ 0us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Specific reserves on restructured loans 0.3efsc_FinancingReceivableModificationsReserve
Unadvanced Commitment on Impaired Loan  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Estimated losses attributable to unadvanced commitments on impaired loans $ 0.2efsc_LoansAndLeasesReceivableImpairedLoansCommitmentToLendReserve
/ efsc_NatureOfCommitmentsAxis
= efsc_UnadvancedCommitmentOnImpairedLoanMember