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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
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Note 10 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items] |  |
Available for Sale Securities | $ 396,508 us-gaap_AssetsFairValueDisclosureRecurring | $ 426,806 us-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 | 30,119 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 29,894 us-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 | 30,119 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 29,894 us-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 | 234,151 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 240,320 us-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 | 234,151 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 240,320 us-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 | 68,797 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 111,712 us-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 | 68,797 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 111,712 us-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 | 245 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 198 us-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 | 219 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 219 us-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 | 464 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 417 us-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 | 62,758 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember | 44,317 us-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 | 62,758 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember | 44,317 us-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 | 219 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_DerivativeInstrumentsMember | 146 us-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 | 219 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_DerivativeInstrumentsMember | 146 us-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 | 245 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 198 us-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 | 395,825 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 426,243 us-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 | $ 438 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 365 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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