v3.3.1.900

Purchase Credit Impaired ("PCI") Loans - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
FDIC proceeds from loss share termination [Line Items] |  |  |
Removal of remaining clawback liability, FDIC loss share termination | $ 3,500 |  |
Removal of remaining FDIC receivable, FDIC loss share termination | 7,200 |  |
One-time pretax charge | 2,400 |  |
PCI loans outstanding | 98,600 | $ 135,300 |
Net payment received from FDIC for loss share termination | 1,300 |  |
Expense recorded related to Clawback Liability | $ 760 | $ 1,201 | $ 951

X
- Definition clawback expense + References No definition available. + Details
Name: | efsc_Clawbackexpense
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition [Line Items] for FDIC proceeds from loss share termination [Table] + References No definition available. + Details
Name: | efsc_FDICproceedsfromlossshareterminationLineItems
Namespace Prefix: | efsc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans Purchased From FDIC Outstanding Balance + References No definition available. + Details
Name: | efsc_LoansPurchasedFromFdicOutstandingBalance
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net payment received from FDIC for loss share termination + References No definition available. + Details
Name: | efsc_NetpaymentreceivedfromFDICforlosssharetermination
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition One-time pretax charge + References No definition available. + Details
Name: | efsc_Onetimepretaxcharge
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Removal of remaining FDIC receivable, FDIC loss share termination + References No definition available. + Details
Name: | efsc_RemovalofremainingFDICreceivableFDIClosssharetermination
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Removal of remaining clawback liability, FDIC loss share termination + References No definition available. + Details
Name: | efsc_RemovalofremainingclawbackliabilityFDIClosssharetermination
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant