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Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	$ 396,508us-gaap_AssetsFairValueDisclosureRecurring	$ 426,806us-gaap_AssetsFairValueDisclosureRecurring
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	30,119us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	29,894us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
US Government Agencies Debt Securities [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	30,119us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	29,894us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	234,151us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	240,320us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Residential Mortgage Backed Securities [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	234,151us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	240,320us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	68,797us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	111,712us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
US States and Political Subdivisions Debt Securities [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	68,797us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	111,712us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	245us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	198us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - 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 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	464us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	417us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Residential Mortgage Loan Long-Term [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	62,758us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember	44,317us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember
Residential Mortgage Loan Long-Term [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	62,758us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember	44,317us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember
Derivative Instruments [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - 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 = egbn_DerivativeInstrumentsMember	146us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_DerivativeInstrumentsMember
Derivative Instruments [Member]
Note 10 - 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_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_DerivativeInstrumentsMember	146us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_DerivativeInstrumentsMember
Fair Value, Inputs, Level 1 [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	245us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	198us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	395,825us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	426,243us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items]
Available for Sale Securities	$ 438us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	$ 365us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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