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Note 11 - Preferred Stock and Warrants (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 24 Months Ended | 0 Months Ended | 30 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 02, 2016 | Mar. 31, 2016 | Jul. 14, 2011 | Mar. 31, 2014 | Oct. 31, 2014 | Nov. 18, 2011 | Oct. 30, 2014
Note 11 - Preferred Stock and Warrants (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in Shares) |  | 223,382 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 563,343 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 2,864,495 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock (in Dollars) |  | $ 15,300,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 10.00%us-gaap_PreferredStockDividendRatePercentage |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) |  |  |  |  |  |  |  |  |  | 423,977 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |
Common Stock Dividend Rate | 10.00%egbn_CommonStockDividendRate |  | 10.00%egbn_CommonStockDividendRate |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) |  |  |  |  |  |  |  |  |  | $ 6.76 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |
Series B Preferred Stock [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Note 11 - Preferred Stock and Warrants (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 9.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | 1.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Note 11 - Preferred Stock and Warrants (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in Shares) |  |  |  |  |  |  | 56,600 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in Dollars per share) |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Proceeds from Issuance of Preferred Stock and Preference Stock (in Dollars) |  |  |  |  |  |  | $ 56,600,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  | 1.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Preferred Stock Redemption Price Percentage |  | 100.00%egbn_PreferredStockRedemptionPricePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding (in Shares) |  | 56,600 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 56,600 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Virginia Heritage Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Note 11 - Preferred Stock and Warrants (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in Dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / dei_LegalEntityAxis = egbn_VirginiaHeritageBankMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preferred Stock, Shares Outstanding (in Shares) |  |  |  |  |  |  |  |  |  |  | 15,300 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = egbn_VirginiaHeritageBankMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Series C Preferred Stock [Member] | Virginia Heritage Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Note 11 - Preferred Stock and Warrants (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
BusinessCombinationSharesPerAcquireesCommonStock (in Dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1 egbn_BusinessCombinationSharesPerAcquireesCommonStock / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Note 11 - Preferred Stock and Warrants (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in Dollars per share) |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  | 1.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |
Preferred Stock, Shares Outstanding (in Shares) |  | 15,300 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |

X
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- Definition Represents the redemption price as a percentage of the liquidation amount plus accrued but unpaid dividends. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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