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Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax [Line Items]    
Net deferred tax asset $ 31,375us-gaap_DeferredTaxAssetsLiabilitiesNet $ 39,408us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred tax assets:    
Allowance for loan losses 17,463us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 16,365us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Asset purchase tax basis difference, net 5,477efsc_DeferredTaxAssetsAssetPurchaseTaxBasisDifferenceNet 16,238efsc_DeferredTaxAssetsAssetPurchaseTaxBasisDifferenceNet
Basis difference on other real estate 516efsc_DeferredTaxAssetsBasisDifferenceOnOtherRealEstate 1,611efsc_DeferredTaxAssetsBasisDifferenceOnOtherRealEstate
Deferred compensation 4,854efsc_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation 4,604efsc_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation
Goodwill and other intangible assets 9,001us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 10,799us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Accrued compensation 2,364us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 2,046us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Unrealized losses on securities available for sale 0us-gaap_DeferredTaxAssetsInvestments 2,672us-gaap_DeferredTaxAssetsInvestments
Other, net 979us-gaap_DeferredTaxAssetsOther 796us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 40,654us-gaap_DeferredTaxAssetsNet 55,131us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
FDIC loss guarantee receivable, net 5,542efsc_DeferredTaxLiabilityFdicLossGuaranteeReceivableNet 12,280efsc_DeferredTaxLiabilityFdicLossGuaranteeReceivableNet
Unrealized gains on securities available for sale 1,091us-gaap_DeferredTaxLiabilitiesInvestments 0us-gaap_DeferredTaxLiabilitiesInvestments
State tax credits held for sale, net of economic hedge 1,051efsc_DeferredTaxLiabilityStateTaxCreditsHeldForSaleNetOfEconomicHedge 1,368efsc_DeferredTaxLiabilityStateTaxCreditsHeldForSaleNetOfEconomicHedge
Core deposit intangibles 1,595us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 2,075us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total deferred tax liabilities 9,279us-gaap_DeferredIncomeTaxLiabilities 15,723us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset 31,375us-gaap_DeferredTaxAssetsLiabilitiesNet 39,408us-gaap_DeferredTaxAssetsLiabilitiesNet
Other Assets    
Deferred Tax [Line Items]    
Net deferred tax asset 31,400us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember		 39,400us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
Deferred tax liabilities:    
Net deferred tax asset $ 31,400us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember		 $ 39,400us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember