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Compensation Plans - Schedule of Various Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 2,900us-gaap_AllocatedShareBasedCompensationExpense $ 5,000us-gaap_AllocatedShareBasedCompensationExpense $ 2,500us-gaap_AllocatedShareBasedCompensationExpense
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 945us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
1,142us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
658us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Total fair value at vesting date 913us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
828us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
660us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Total unrecognized compensation cost for nonvested stock units 1,462us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
2,168us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
1,256us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Expected years to recognize unearned compensation 2 years 8 months 12 days 3 years 7 months 6 days 4 years
Stock Options and SSARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 103us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= efsc_StockOptionsAndStockSettledStockAppreciationRightsMember
213us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= efsc_StockOptionsAndStockSettledStockAppreciationRightsMember
478us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= efsc_StockOptionsAndStockSettledStockAppreciationRightsMember
Intrinsic value of option exercises on date of exercise 226us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= efsc_StockOptionsAndStockSettledStockAppreciationRightsMember
300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= efsc_StockOptionsAndStockSettledStockAppreciationRightsMember
327us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= efsc_StockOptionsAndStockSettledStockAppreciationRightsMember
Cash received from the exercise of stock options 149us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= efsc_StockOptionsAndStockSettledStockAppreciationRightsMember
2,040us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= efsc_StockOptionsAndStockSettledStockAppreciationRightsMember
1,291us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= efsc_StockOptionsAndStockSettledStockAppreciationRightsMember
Stock Plan for Non-Management Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 329us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= efsc_StockPlanForNonManagementDirectorsMember
$ 262us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= efsc_StockPlanForNonManagementDirectorsMember
$ 257us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= efsc_StockPlanForNonManagementDirectorsMember
Number of shares issued 23,135,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_PlanNameAxis
= efsc_StockPlanForNonManagementDirectorsMember
16,990,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_PlanNameAxis
= efsc_StockPlanForNonManagementDirectorsMember
18,410,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_PlanNameAxis
= efsc_StockPlanForNonManagementDirectorsMember
Weighted average fair value (usd per share) $ 19.20efsc_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= efsc_StockPlanForNonManagementDirectorsMember
$ 15.40efsc_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= efsc_StockPlanForNonManagementDirectorsMember
$ 14.00efsc_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= efsc_StockPlanForNonManagementDirectorsMember