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Loans - Evidence of More Than Insignificant Deterioration of Credit Quality Since Origination (Details) $ in Thousands | Jul. 21, 2021 USD ($)
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Text Block [Abstract] |
Par value of acquired loans | $ 180,440
Allowance for credit losses | (7,006)
Non-credit discount | (6,428)
Purchase price of acquired loans | $ 167,006

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- Definition allowance on pcd loans + References No definition available. + Details
Name: | efsc_AllowancePcdLoans
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition noncredit premium + References No definition available. + Details
Name: | efsc_NoncreditPremium
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition par value, acquired loans + References No definition available. + Details
Name: | efsc_ParValueAcquiredLoans
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition purchase price, acquired loans + References No definition available. + Details
Name: | efsc_PurchasePriceAcquiredLoans
Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration