v3.3.1.900

Portfolio Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured (Details) - Non-Covered Loans $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) loan | Dec. 31, 2014 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 1 | 8
Pre-Modification Outstanding Recorded Balance | $ 303 | $ 5,862
Post-Modification Outstanding Recorded Balance | $ 303 | $ 5,612
Commercial and industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 1 | 2
Pre-Modification Outstanding Recorded Balance | $ 303 | $ 658
Post-Modification Outstanding Recorded Balance | $ 303 | $ 658
CRE - investor owned |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 2
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 606
Post-Modification Outstanding Recorded Balance | $ 0 | $ 606
CRE - owner occupied |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 1
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 603
Post-Modification Outstanding Recorded Balance | $ 0 | $ 603
Construction and land development |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 1
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 2,827
Post-Modification Outstanding Recorded Balance | $ 0 | $ 2,827
Residential real estate |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 1
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 125
Post-Modification Outstanding Recorded Balance | $ 0 | $ 125
Consumer and other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 1
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 1,043
Post-Modification Outstanding Recorded Balance | $ 0 | $ 793

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 Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | efsc_LoansByMajorCategoryAxis=efsc_NoncoveredLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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=efsc_ResidentialRealEstateFinancingReceivableMember
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: |