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Note 5 - Loans and Allowance for Credit Losses (Details) - Troubled Debt Restructurings (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]      
Number of Contracts 0us-gaap_FinancingReceivableModificationsNumberOfContracts2 0us-gaap_FinancingReceivableModificationsNumberOfContracts2  
Troubled Debt Restructuring [Member] | Commercial Loan [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Modifications [Line Items]      
TDRs 223us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		   $ 227us-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		   1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
TDRs 223us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		   227us-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 7,823us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateInvestmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		   7,849us-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]      
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 7,823us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateInvestmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		   7,849us-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 553us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		   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]      
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 553us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		   565us-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 5,063us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		   5,088us-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]      
Financing Receivable, Modifications [Line Items]      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		   1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
TDRs 5,063us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= egbn_ConstructionCommercialAndResidentialMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		   5,088us-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 13,439us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		   13,502us-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 223us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		   227us-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		   6us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember
TDRs 13,662us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember		   $ 13,729us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_TroubledDebtRestructuringMember