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Preferred Stock and Common Stock Warrants (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
Jan. 09, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 07, 2012
Dec. 19, 2008
Class of Stock [Line Items]            
Shares sold   0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued      
Common stock, par value   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare      
Stock repurchased during period, value $ 1,000,000us-gaap_StockRepurchasedDuringPeriodValue   $ 1,006,000us-gaap_StockRepurchasedDuringPeriodValue $ 35,000,000us-gaap_StockRepurchasedDuringPeriodValue    
Dividends paid on preferred stock   0us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock 0us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock 1,711,000us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock    
Fixed Rate Cumulative Perpetual Pfeferred Stock, Series A [Member]            
Class of Stock [Line Items]            
Shares sold           35,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Stock repurchased during period, value         35,400,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
 
Dividends paid on preferred stock         400,000us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
 
Common Stock            
Class of Stock [Line Items]            
Number of shares available for purchase with warrants           324,074us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Common stock, par value           $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Aggregate investment by U.S. Treasury           $ 35,000,000efsc_PreferredStockAndClassOfWarrantOrRightCashReceivedOnIssuance
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember