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Fair Value Measurements - Summary of difference between aggregate fair value and aggregate unpaid principal balance (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans held for sale	$ 56,707	$ 19,254
Residential mortgage backed securities
Loans held for sale	52,927	19,254
Aggregate Unpaid Principal Balance	52,054	18,797
Difference	873	$ 457
FHA Mortgage Backed Securities [Member]
Loans held for sale	3,780
Aggregate Unpaid Principal Balance	$ 3,780

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=egbn_FhaMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: