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Purchase Credit Impaired ("PCI") Loans - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
PCI loans outstanding $ 135.3efsc_LoansPurchasedFromFdicOutstandingBalance $ 201.7efsc_LoansPurchasedFromFdicOutstandingBalance
Contingent liability recorded related to Clawback Liability 2.7efsc_AmountOfEstimatedClawbackLiability  
Expense recorded related to Clawback Liability $ 1.2efsc_Clawbackexpense