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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

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- 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

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- 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

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- 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

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