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Note 2 - Mergers and Acquisitions (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended 30 Months Ended 10 Months Ended
Jun. 14, 2013
Dec. 31, 2014
Dec. 31, 2012
Oct. 31, 2014
Mar. 31, 2014
Oct. 31, 2014
Oct. 30, 2014
Dec. 31, 2013
Jul. 14, 2011
Note 2 - Mergers and Acquisitions (Details) [Line Items]                  
Share Based Compensation Arrangement by Share Based Payment Award Options Acquired in Business Combination (in Shares)   401,497egbn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAcquiredInBusinessCombination              
Preferred Stock, Dividend Rate, Percentage 10.00%us-gaap_PreferredStockDividendRatePercentage                
Business Combination, Acquisition Related Costs   $ 4,699,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 24,000us-gaap_BusinessCombinationAcquisitionRelatedCosts            
Series A Preferred Stock [Member] | Virginia Heritage Bank [Member]                  
Note 2 - Mergers and Acquisitions (Details) [Line Items]                  
Preferred Stock, Shares Outstanding (in Shares)             15,300us-gaap_PreferredStockSharesOutstanding
/ dei_LegalEntityAxis
= egbn_VirginiaHeritageBankMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Preferred Stock, Liquidation Preference Per Share (in Dollars per share)             $ 1,000us-gaap_PreferredStockLiquidationPreference
/ dei_LegalEntityAxis
= egbn_VirginiaHeritageBankMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Series C Preferred Stock [Member] | Virginia Heritage Bank [Member]                  
Note 2 - Mergers and Acquisitions (Details) [Line Items]                  
Business Combination, Shares Issued for Each Acquiree's Share Converted (in Shares)             1egbn_BusinessCombinationSharesIssuedForEachAcquireesShareConverted
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Series C Preferred Stock [Member]                  
Note 2 - Mergers and Acquisitions (Details) [Line Items]                  
Preferred Stock, Shares Outstanding (in Shares)   15,300us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
          0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Preferred Stock, Liquidation Preference Per Share (in Dollars per share)   $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
        $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
$ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Preferred Stock, Dividend Rate, Percentage       1.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
         
Series B Preferred Stock [Member]                  
Note 2 - Mergers and Acquisitions (Details) [Line Items]                  
Preferred Stock, Shares Outstanding (in Shares)   56,600us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
          56,600us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
 
Preferred Stock, Liquidation Preference Per Share (in Dollars per share)   $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
        $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
$ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
$ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Preferred Stock, Dividend Rate, Percentage         1.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Core Deposits [Member] | Virginia Heritage Bank [Member]                  
Note 2 - Mergers and Acquisitions (Details) [Line Items]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   4,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
  4,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
  4,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
     
Finite-Lived Intangible Asset, Useful Life           6 years      
Virginia Heritage Bank [Member] | Minimum [Member]                  
Note 2 - Mergers and Acquisitions (Details) [Line Items]                  
Property, Plant and Equipment, Useful Life       1 year          
Virginia Heritage Bank [Member] | Maximum [Member]                  
Note 2 - Mergers and Acquisitions (Details) [Line Items]                  
Property, Plant and Equipment, Useful Life       5 years          
Virginia Heritage Bank [Member]                  
Note 2 - Mergers and Acquisitions (Details) [Line Items]                  
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in Shares)       0.6632us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
  0.6632us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
     
Convertible Stock Cash Received Per Share (in Dollars per share)       $ 7.50egbn_ConvertibleStockCashReceivedPerShare
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
         
Share Based Compensation Arrangement by Share Based Payment Award Options Acquired in Business Combination (in Shares)       401,497egbn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAcquiredInBusinessCombination
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
         
Payments to Acquire Businesses, Gross       45,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
         
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)       4,010,261us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
         
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       914,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
  914,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
     
Loans Fair Value at Acquisition   804,320,000egbn_LoansFairValueAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
  800,000,000egbn_LoansFairValueAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
  800,000,000egbn_LoansFairValueAtAcquisition
/ 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
  645,000,000egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositLiabilities
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
     
Business Combination, Consideration Transferred       189,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
         
Business Combination, Acquisition Related Costs   4,700,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
             
Goodwill   $ 102,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
  $ 102,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember
  $ 102,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= egbn_VirginiaHeritageBankMember