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Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	$ 426,806us-gaap_AssetsFairValueDisclosureRecurring	$ 420,163us-gaap_AssetsFairValueDisclosureRecurring
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	29,894us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	47,335us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
US Government Agencies Debt Securities [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	29,894us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	47,335us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	240,320us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	228,674us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Residential Mortgage Backed Securities [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	240,320us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	228,674us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	198us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	165us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	219us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	219us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Equity Securities [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	417us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	384us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Residential Mortgage Loan Long-Term [Member] | Fair Value, Inputs, Level 2 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	44,317us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember	42,030us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember
Residential Mortgage Loan Long-Term [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	44,317us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember	42,030us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember
Derivative Instruments [Member] | Fair Value, Inputs, Level 3 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	146us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_DerivativeInstrumentsMember
Derivative Instruments [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	146us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_DerivativeInstrumentsMember
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	111,712us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember	101,740us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Municipal Bonds [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	111,712us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember	101,740us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Fair Value, Inputs, Level 1 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	198us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	165us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	426,243us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	419,779us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]
Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	$ 365us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	$ 219us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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