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Note 4 - Derivatives (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Note 4 - Derivatives (Details) [Line Items]      
Derivative, Notional Amount $ 62,400,000invest_DerivativeNotionalAmount    
Derivative Asset 219,000us-gaap_DerivativeAssets 146,000us-gaap_DerivativeAssets 0us-gaap_DerivativeAssets
Derivative Liability 140,000us-gaap_DerivativeLiabilities 250,000us-gaap_DerivativeLiabilities 0us-gaap_DerivativeLiabilities
Derivative Instruments and Hedges, Assets     0us-gaap_DerivativeInstrumentsAndHedges
Derivative Instruments [Member]      
Note 4 - Derivatives (Details) [Line Items]      
Noninterest Income, Other 30,000us-gaap_NoninterestIncomeOther
/ us-gaap_DerivativeByNatureAxis
= egbn_DerivativeInstrumentsMember
   
Hedging Activities [Member]      
Note 4 - Derivatives (Details) [Line Items]      
Noninterest Income, Other 171,000us-gaap_NoninterestIncomeOther
/ us-gaap_DerivativeByNatureAxis
= egbn_HedgingActivitiesMember
   
Other Assets [Member]      
Note 4 - Derivatives (Details) [Line Items]      
Derivative Asset 219,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
   
Other Liabilities [Member]      
Note 4 - Derivatives (Details) [Line Items]      
Derivative Liability $ 140,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember