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Note 5 - Loans and Allowance for Credit Losses (Details) - Troubled Debt Restructurings (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Modifications [Line Items]    
Number of Contracts 4us-gaap_FinancingReceivableModificationsNumberOfContracts2 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
Troubled Debt Restructuring [Member] | Commercial Loan [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
TDRs 227us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 4,042us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Troubled Debt Restructuring [Member] | Commercial Loan [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
TDRs 227us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 4,042us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
Troubled Debt Restructuring [Member] | Commercial Real Estate Investment [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
TDRs 7,849us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateInvestmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 3,377us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateInvestmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Troubled Debt Restructuring [Member] | Commercial Real Estate Investment [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
TDRs   217us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateInvestmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Troubled Debt Restructuring [Member] | Commercial Real Estate Investment [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateInvestmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateInvestmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
TDRs 7,849us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateInvestmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 3,594us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateInvestmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
Troubled Debt Restructuring [Member] | Commercial Real Estate Owner Occupied [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
TDRs 565us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		  
Troubled Debt Restructuring [Member] | Commercial Real Estate Owner Occupied [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
TDRs   4,081us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Troubled Debt Restructuring [Member] | Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
TDRs 565us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 4,081us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
Troubled Debt Restructuring [Member] | Construction, Commercial And Residential [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
TDRs 5,088us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 4,567us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Troubled Debt Restructuring [Member] | Construction, Commercial And Residential [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
TDRs   912us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Troubled Debt Restructuring [Member] | Construction, Commercial And Residential [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
TDRs 5,088us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 5,479us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
Troubled Debt Restructuring [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
TDRs 13,502us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 7,944us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Troubled Debt Restructuring [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
TDRs 227us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 9,252us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Troubled Debt Restructuring [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 6us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 9us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
TDRs 13,729us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		 17,196us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember