v2.4.0.8

Fair Value Measurements - Estimate of the Fair Value of Financial Instruments Not Recorded at Fair Value on Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financial Assets: |  |
State tax credits held for sale | $ 20,139 | $ 23,020
Fair Value, Level 1 |  |
Financial Assets: |  |
Portfolio loans, net | 0 | 0
State tax credits held for sale | 0 | 0
Financial Liabilities: |  |
Deposits | 1,825,274 | 2,079,141
Subordinated debentures | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Other borrowings | 0 | 0
Fair Value, Level 2 |  |
Financial Assets: |  |
Portfolio loans, net | 0 | 0
State tax credits held for sale | 0 | 0
Financial Liabilities: |  |
Deposits | 0 | 0
Subordinated debentures | 40,474 | 65,840
Federal Home Loan Bank advances | 126,234 | 89,301
Other borrowings | 178,228 | 245,224
Fair Value, Level 3 |  |
Financial Assets: |  |
Portfolio loans, net | 2,229,411 | 2,266,834
State tax credits held for sale | 40,798 | 43,802
Financial Liabilities: |  |
Deposits | 628,696 | 589,972
Subordinated debentures | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Other borrowings | 0 | 0
Estimated fair value |  |
Financial Assets: |  |
Portfolio loans, net | 2,229,411 | 2,266,834
State tax credits held for sale | 40,798 | 43,802
Financial Liabilities: |  |
Deposits | 2,453,970 | 2,669,113
Subordinated debentures | 40,474 | 65,840
Federal Home Loan Bank advances | 126,234 | 89,301
Other borrowings | $ 178,228 | $ 245,224

X
- Definition Loans And Leases Receivable Net Reported Amount Fair Value Disclosure + References No definition available. + Details
Name: | efsc_LoansAndLeasesReceivableNetReportedAmountFairValueDisclosure
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other Borrowings Fair Value Disclosure + References No definition available. + Details
Name: | efsc_OtherBorrowingsFairValueDisclosure
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition State Tax Credits Held For Sale, Fair Value Disclosure + References No definition available. + Details
Name: | efsc_StateTaxCreditsHeldForSaleFairValueDisclosure
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References No definition available. + Details
Name: | us-gaap_DepositsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of borrowing from Federal Home Loan Bank (FHLBank). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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