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Fair Value Measurements (Details 1) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loans held for sale	$ 18,728	$ 25,096
Residential Mortgage Backed Securities [Member]
Loans held for sale	18,728	25,096
Aggregate Unpaid Principal Balance	18,488	24,674
Difference	$ 240	$ 422

X

- Definition

It represents the amount of aggregate unpaid principal balance.

+ References

No definition available.

+ Details

Name:	egbn_AggregateUnpaidPrincipalBalance
Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

It represents the amount of difference between fair value and aggregate unpaid principal balance.

+ References

No definition available.

+ Details

Name:	egbn_DifferenceBetweenFairValueAndAggregateUnpaidPrincipalBalance
Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: