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Portfolio Loans - Acquired PCD Loans (Details) $ in Thousands | Nov. 12, 2020 USD ($)
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Receivables [Abstract] |
par value, acquired loans | $ 180,440
allowance pcd loans | (7,006)
noncredit premium | (6,428)
purchase price, acquired loans | $ 167,006

X
- 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

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

X
- 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

X
- 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

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