v3.3.1.900

Purchase Credit Impaired ("PCI") Loans - Summary of FDIC Loss Share Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Total Cash received from FDIC for covered assets | $ 3,528 |  |
Reductions for loss share termination | (5,922) | $ 0 |
FDIC Indemnification Asset [Roll Forward] |  |  |
Balance at beginning of period | 15,866 | 34,319 |
Cash received from the FDIC for covered assets | (2,275) | (9,605) | $ (10,981)
FDIC reimbursable losses (recoveries) | (1,386) | 459 |
Amortization, net | (2,293) | (6,342) |
Loan impairment (impairment reversal) | (1,113) | 841 |
Reductions for payments on covered assets in excess of expected cash flows | (1,624) | (3,806) |
Balance at end of period | $ 0 | $ 15,866 | $ 34,319

X
- Definition FDIC Indemnification Asset, Loan Impairment Recapture + References No definition available. + Details
Name: | efsc_FDICIndemnificationAssetLoanImpairmentRecapture
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition FDIC loss share receivable + References No definition available. + Details
Name: | efsc_FdicLossShareReceivable
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Net cash proceeds received from FDIC loss share receivable + References No definition available. + Details
Name: | efsc_NetCashProceedsReceivedFromFdicLossShareReceivable
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reductions for loss share termination + References No definition available. + Details
Name: | efsc_Reductionsforlosssharetermination
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reductions for payments on Covered assets in excess of expected cash flows + References No definition available. + Details
Name: | efsc_ReductionsforpaymentsonCoveredassetsinexcessofexpectedcashflows
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total Cash received from FDIC for covered assets + References No definition available. + Details
Name: | efsc_TotalCashreceivedfromFDICforcoveredassets
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increases to the indemnification asset due to accretion of the loan discount relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetAccretionOfDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Change in carrying amount of the indemnification asset relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). The change includes for example, but is not limited to, acquisitions, additional estimated losses, disposals, cash payments, accretion of discount and write-offs, net of recoveries. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration