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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
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Note 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items] |  |
Available for Sale Securities | $ 426,806 us-gaap_AssetsFairValueDisclosureRecurring | $ 420,163 us-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 | 29,894 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 47,335 us-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 | 29,894 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 47,335 us-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 | 240,320 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 228,674 us-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 | 240,320 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 228,674 us-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 | 198 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 165 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 22 - 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 22 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis [Line Items] |  |
Available for Sale Securities | 417 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 384 us-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 | 44,317 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember | 42,030 us-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 | 44,317 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = egbn_ResidentialMortgageLoanLongTermMember | 42,030 us-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 | 146 us-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 | 146 us-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 | 111,712 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 101,740 us-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 | 111,712 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 101,740 us-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 | 198 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 165 us-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 | 426,243 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 419,779 us-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 | $ 365 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 219 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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