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Note 4 - Investment Securities Available-for-Sale (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 4 - Investment Securities Available-for-Sale (Details) [Line Items] |  |  |
Debt Securities Weighted Average Duration | 4 years |  |
Federal Home Loan Bank Stock and Federal Reserve Bank Stock | $ 22,560,000 us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock | $ 11,272,000 us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock |
Available-for-sale Securities, Gross Realized Gains | 298,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 237,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 941,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Available-for-sale Securities, Gross Realized Losses | 276,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | 218,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | 251,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Proceeds from Sale and Maturity of Marketable Securities | 49,910,000 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities | 22,100,000 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities | 77,100,000 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Available-for-sale Securities Pledged as Collateral | $ 257,200,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral |  |
Percent Of Shareholders' Equity | 10.00%egbn_PercentOfShareholdersEquity | 10.00%egbn_PercentOfShareholdersEquity |
Debt Securities [Member] | Total Investment Securities [Member] | Investment Securities Concentration Risk [Member] |  |  |
Note 4 - Investment Securities Available-for-Sale (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 99.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = egbn_TotalInvestmentSecuritiesMember / us-gaap_ConcentrationRiskByTypeAxis = egbn_InvestmentSecuritiesConcentrationRiskMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |  |

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- Definition This item represents the weighted average duration of debt securities held. + References No definition available. + Details
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- Definition This item represents the percentage of the entity's stockholders' equity. + References No definition available. + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock. + References No definition available. + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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