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Note 8 - Derivatives (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 8 - Derivatives (Details) [Line Items]    
Derivative, Notional Amount $ 45,100,000invest_DerivativeNotionalAmount  
Derivative Asset 146,000us-gaap_DerivativeAssets 0us-gaap_DerivativeAssets
Derivative Liability 250,000us-gaap_DerivativeLiabilities 0us-gaap_DerivativeLiabilities
Derivative Instruments and Hedges, Assets   0us-gaap_DerivativeInstrumentsAndHedges
Derivative Instruments [Member]    
Note 8 - Derivatives (Details) [Line Items]    
Noninterest Income, Other 140,000us-gaap_NoninterestIncomeOther
/ us-gaap_DerivativeByNatureAxis
= egbn_DerivativeInstrumentsMember
 
Hedging Activities [Member]    
Note 8 - Derivatives (Details) [Line Items]    
Noninterest Income, Other (108,000)us-gaap_NoninterestIncomeOther
/ us-gaap_DerivativeByNatureAxis
= egbn_HedgingActivitiesMember
 
Other Assets [Member]    
Note 8 - Derivatives (Details) [Line Items]    
Derivative Asset 146,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
 
Other Liabilities [Member]    
Note 8 - Derivatives (Details) [Line Items]    
Derivative Liability $ 250,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember