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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) |  | 401,497 egbn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAcquiredInBusinessCombination |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 10.00%us-gaap_PreferredStockDividendRatePercentage |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  | $ 4,699,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts | $ 24,000 us-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) |  |  |  |  |  |  | 15,300 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = egbn_VirginiaHeritageBankMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
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 |  |
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) |  |  |  |  |  |  | 1 egbn_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) |  | 15,300 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |
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 |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Note 2 - Mergers and Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |
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 |
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
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 |  | 4,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  | 4,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  | 4,600,000 us-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) |  |  |  | 0.6632 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  | 0.6632 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |
Convertible Stock Cash Received Per Share (in Dollars per share) |  |  |  | $ 7.50 egbn_ConvertibleStockCashReceivedPerShare / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award Options Acquired in Business Combination (in Shares) |  |  |  | 401,497 egbn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAcquiredInBusinessCombination / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | 45,400,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) |  |  |  | 4,010,261 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  | 914,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  | 914,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |
Loans Fair Value at Acquisition |  | 804,320,000 egbn_LoansFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  | 800,000,000 egbn_LoansFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  | 800,000,000 egbn_LoansFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposit Liabilities |  |  |  | 645,000,000 egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositLiabilities / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  | 645,000,000 egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositLiabilities / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |
Business Combination, Consideration Transferred |  |  |  | 189,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |  |  |
Business Combination, Acquisition Related Costs |  | 4,700,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |  |  |  |  |
Goodwill |  | $ 102,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  | $ 102,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  | $ 102,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |  |

X
- Definition Amount of deposit liabilities assumed at the acquisition date. + References No definition available. + Details
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- Definition The number of shares issued for each acquiree's share converted in a business combination. + References No definition available. + Details
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- Definition The dollar amount each share of common stock can be converted into. + References No definition available. + Details
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- Definition Loans acquired in a business combination, at fair value of the receivables acquired, for both loans transferred in and otherwise accounted for. + References No definition available. + Details
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- Definition Number of share options (or share units) acquired in business combination. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + 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 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + 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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