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Portfolio Loans - Acquired PCD Loans (Details) $ in Thousands	Nov. 12, 2020 USD ($)
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