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Note 7 - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Aug. 31, 2008 | Oct. 31, 2014 | Jan. 31, 2011 | Aug. 31, 2009
Core Deposits [Member] | Fidelity [Member] |  |  |  |  |
Note 7 - Intangible Assets (Details) [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 804 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = egbn_FidelityMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | $ 2,300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = egbn_FidelityMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 1 year 73 days |  |  |  |
Core Deposits [Member] | Virginia Heritage Bank [Member] |  |  |  |  |
Note 7 - Intangible Assets (Details) [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 4,400 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  | 4,600 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 6 years |  |  |  |
Core Deposits [Member] | Branch Office [Member] |  |  |  |  |
Note 7 - Intangible Assets (Details) [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | 215 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = egbn_BranchOfficeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
Fidelity [Member] |  |  |  |  |
Note 7 - Intangible Assets (Details) [Line Items] |  |  |  |  |
Goodwill | 2,200 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = egbn_FidelityMember |  |  |  | 360 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = egbn_FidelityMember
Virginia Heritage Bank [Member] |  |  |  |  |
Note 7 - Intangible Assets (Details) [Line Items] |  |  |  |  |
Goodwill | $ 102,300 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  | $ 102,300 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |

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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 Remaining amortization period 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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