v3.3.1.900

Portfolio Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured and Subsequently Defaulted (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) loan | Dec. 31, 2014 USD ($) loan
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items] |  |
Number of Loans | loan | 0 | 1
Recorded Balance | $ | $ 0 | $ 241
Commercial and industrial |  |
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items] |  |
Number of Loans | loan | 0 | 0
Recorded Balance | $ | $ 0 | $ 0
CRE - investor owned |  |
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items] |  |
Number of Loans | loan | 0 | 0
Recorded Balance | $ | $ 0 | $ 0
CRE - owner occupied |  |
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items] |  |
Number of Loans | loan | 0 | 0
Recorded Balance | $ | $ 0 | $ 0
Construction and land development |  |
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items] |  |
Number of Loans | loan | 0 | 1
Recorded Balance | $ | $ 0 | $ 241
Residential |  |
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items] |  |
Number of Loans | loan | 0 | 0
Recorded Balance | $ | $ 0 | $ 0
Consumer and other |  |
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items] |  |
Number of Loans | loan | 0 | 0
Recorded Balance | $ | $ 0 | $ 0

X
- Definition Number of Loans + References No definition available. + Details
Name: | efsc_NumberofLoans
Namespace Prefix: | efsc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=efsc_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=efsc_CommercialRealEstateOwnerOccupiedFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=efsc_CommercialRealEstateInvestorOwnedFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=efsc_ConstructionAndLandDevelopmentFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=efsc_ConsumerAndOtherPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |