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Note 1 - Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended 3 Months Ended 0 Months Ended 6 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Oct. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Goodwill, Impairment Loss $ 0us-gaap_GoodwillImpairmentLoss        
Deferred Tax Assets, Valuation Allowance 0us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance     0us-gaap_DeferredTaxAssetsValuationAllowance
Furniture and Fixtures [Member] | Minimum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Property, Plant and Equipment, Useful Life   5 years      
Furniture and Fixtures [Member] | Maximum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Property, Plant and Equipment, Useful Life   7 years      
Building and Building Improvements [Member] | Minimum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Property, Plant and Equipment, Useful Life   10 years      
Building and Building Improvements [Member] | Maximum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Property, Plant and Equipment, Useful Life   40 years      
Assets Held-for-sale [Member] | Virginia Heritage Bank [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans     3,000,000egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
/ us-gaap_MajorPropertyClassAxis
= us-gaap_AssetsHeldForSaleMember
   
Banking Services [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Number of Offices   22egbn_NumberOfOffices
/ us-gaap_ProductOrServiceAxis
= egbn_BankingServicesMember
     
Lending Services [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Number of Offices   4egbn_NumberOfOffices
/ us-gaap_ProductOrServiceAxis
= egbn_LendingServicesMember
     
Core Deposits [Member] | Virginia Heritage Bank [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     4,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
Finite-Lived Intangible Asset, Useful Life     6 years    
Servicing Contracts [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Other Intangible Assets, Net 0us-gaap_OtherIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
0us-gaap_OtherIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
    0us-gaap_OtherIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
Computer Software, Intangible Asset [Member] | Minimum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Property, Plant and Equipment, Useful Life   3 years      
Computer Software, Intangible Asset [Member] | Maximum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Property, Plant and Equipment, Useful Life   5 years      
Risk Level, High [Member] | Eagle Commercial Ventures, LLC [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Loans Receivable, Net 6,200,000us-gaap_LoansReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_RiskLevelHighMember
/ dei_LegalEntityAxis
= egbn_EagleCommercialVenturesLLCMember
12,000,000us-gaap_LoansReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_RiskLevelHighMember
/ dei_LegalEntityAxis
= egbn_EagleCommercialVenturesLLCMember
     
Virginia Heritage Bank [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans     800,000,000egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposit Liabilities     645,000,000egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositLiabilities
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Borrowings     95,000,000egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
   
Goodwill     102,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
   
Business Combination, Fair Value Credit Mark on Loan Portfolio     $ 12,500,000egbn_BusinessCombinationFairValueCreditMarkOnLoanPortfolio
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
   
Minimum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Loan Period   30 days      
Maximum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Loan Period       90 days  
Eagle Commercial Ventures, LLC [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Number of Higher Risk Lending Transactions Outstanding 4egbn_NumberOfHigherRiskLendingTransactionsOutstanding
/ dei_LegalEntityAxis
= egbn_EagleCommercialVenturesLLCMember
6egbn_NumberOfHigherRiskLendingTransactionsOutstanding
/ dei_LegalEntityAxis
= egbn_EagleCommercialVenturesLLCMember