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Note 5 - Loans and Allowance for Credit Losses (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Dec. 31, 2014
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Loans and Leases Receivable, Deferred Income (in Dollars) $ 15,800,000us-gaap_LoansAndLeasesReceivableDeferredIncome $ 13,600,000us-gaap_LoansAndLeasesReceivableDeferredIncome   $ 15,600,000us-gaap_LoansAndLeasesReceivableDeferredIncome
Servicing Asset at Fair Value, Amount (in Dollars) 67,700,000us-gaap_ServicingAssetAtFairValueAmount     67,900,000us-gaap_ServicingAssetAtFairValueAmount
Minimum Debt Service Coverage 1.15egbn_MinimumDebtServiceCoverage      
Stress Test Assumption, Increase in Interest Rates 2.00%egbn_StressTestAssumptionIncreaseInterestRates      
Financing Receivable, Net (in Dollars) 4,444,893,000us-gaap_NotesReceivableNet     4,312,399,000us-gaap_NotesReceivableNet
Loan Percent 100.00%egbn_LoanPercent 100.00%egbn_LoanPercent   100.00%egbn_LoanPercent
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1    
Financing Receivable, Modifications, Number of Contracts 0us-gaap_FinancingReceivableModificationsNumberOfContracts2 0us-gaap_FinancingReceivableModificationsNumberOfContracts2    
Performing Under Restructured Terms [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Financing Receivable, Modifications, Recorded Investment (in Dollars) 13,400,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_PerformingUnderRestructuredTermsMember
7,900,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_PerformingUnderRestructuredTermsMember
  13,500,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= egbn_PerformingUnderRestructuredTermsMember
Commercial Real Estate Owner Occupied [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Percent of Loan Portfolio 12.00%egbn_PercentOfLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
     
Financing Receivable, Net (in Dollars) 493,003,000us-gaap_NotesReceivableNet
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
    461,581,000us-gaap_NotesReceivableNet
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate and Real Estate Construction Loans [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Percent of Loan Portfolio 71.00%egbn_PercentOfLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= egbn_CommercialRealEstateandRealEstateConstructionLoansMember
     
Excluding Owner Occupied Commercial Real Estate and Commercial Construction Loans [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Percent of Loan Portfolio 59.00%egbn_PercentOfLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= egbn_ExcludingOwnerOccupiedCommercialRealEstateAndCommercialConstructionLoansMember
     
Commercial Loan [Member] | Preferred Term [Member] | Maximum [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Loan Period 7 years      
Commercial Loan [Member] | Preferred Term [Member] | Minimum [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Loan Period 5 years      
Commercial Loan [Member] | Maximum [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Loan Period 10 years      
Amortization Term 25 years      
Commercial Loan [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Percent of Loan Portfolio 21.00%egbn_PercentOfLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
     
Financing Receivable, Net (in Dollars) 933,715,000us-gaap_NotesReceivableNet
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
    916,226,000us-gaap_NotesReceivableNet
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
SBA Loans [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Percent of Loan Portfolio 1.00%egbn_PercentOfLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= egbn_SBALoansMember
     
Home Equity Line of Credit [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Percent of Loan Portfolio 5.00%egbn_PercentOfLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
     
Financing Receivable, Net (in Dollars) 120,543,000us-gaap_NotesReceivableNet
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
    122,536,000us-gaap_NotesReceivableNet
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
Residential Mortgage Loan [Member] | Maximum [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Loan Period 10 years      
Residential Mortgage Loan [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Percent of Loan Portfolio 3.00%egbn_PercentOfLoanPortfolio
/ us-gaap_FinancialInstrumentAxis
= egbn_ResidentialMortgageLoanMember
     
Commercial Land Acquisition Loans [Member] | Maximum [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Loan Period 24 months      
ADC Loans [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Financing Receivable, Net (in Dollars) 912,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancialInstrumentAxis
= egbn_ADCLoansMember
     
Loan Percent 37.00%egbn_LoanPercent
/ us-gaap_FinancialInstrumentAxis
= egbn_ADCLoansMember
     
Nonaccrual Loans [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Impaired Financing Receivable, Interest Income, Cash Basis Method (in Dollars) 0us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= egbn_NonaccrualLoansMember
     
Nonaccrual Loans Current and in Accordance with Original Terms [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Impaired Financing Receivable, Interest Income, Accrual Method (in Dollars) 310,000us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_StatementScenarioAxis
= egbn_NonaccrualLoansCurrentAndInAccordanceWithOriginalTermsMember
     
Construction Loans [Member] | Maximum [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Loan Period 36 months      
Construction Loans [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Financing Receivable, Net (in Dollars) 911,571,000us-gaap_NotesReceivableNet
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
    851,464,000us-gaap_NotesReceivableNet
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
Nonperforming Financing Receivable [Member] | Fidelity [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net (in Dollars) 3,400,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= egbn_FidelityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
     
Nonperforming Financing Receivable [Member] | Virginia Heritage Bank [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net (in Dollars) $ 4,600,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
     
Maximum [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Loan to Value Ratio 80.00%egbn_LoanToValueRatio
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Loan Period     90 days  
Minimum [Member]        
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]        
Interest Rate Adjustment Frequency 5 years      
Loan Period 30 days