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Note 1 - Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended | 3 Months Ended | 0 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Mar. 31, 2015 | Oct. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Goodwill, Impairment Loss | $ 0 us-gaap_GoodwillImpairmentLoss |  |  |  |
Deferred Tax Assets, Valuation Allowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance |  |  | 0 us-gaap_DeferredTaxAssetsValuationAllowance
Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |  |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |  |
Assets Held-for-sale [Member] | Virginia Heritage Bank [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans |  |  | 3,000,000 egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember |  |
Banking Services [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Number of Offices |  | 22 egbn_NumberOfOffices / us-gaap_ProductOrServiceAxis = egbn_BankingServicesMember |  |  |
Lending Services [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Number of Offices |  | 4 egbn_NumberOfOffices / us-gaap_ProductOrServiceAxis = egbn_LendingServicesMember |  |  |
Core Deposits [Member] | Virginia Heritage Bank [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 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 |  |
Servicing Contracts [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Other Intangible Assets, Net | 0 us-gaap_OtherIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ServicingContractsMember | 0 us-gaap_OtherIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ServicingContractsMember |  |  | 0 us-gaap_OtherIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ServicingContractsMember
Computer Software, Intangible Asset [Member] | Minimum [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |
Computer Software, Intangible Asset [Member] | Maximum [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |  |  |
Risk Level, High [Member] | Eagle Commercial Ventures, LLC [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Loans Receivable, Net | 6,200,000 us-gaap_LoansReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_RiskLevelHighMember / dei_LegalEntityAxis = egbn_EagleCommercialVenturesLLCMember | 12,000,000 us-gaap_LoansReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_RiskLevelHighMember / dei_LegalEntityAxis = egbn_EagleCommercialVenturesLLCMember |  |  |
Virginia Heritage Bank [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans |  |  | 800,000,000 egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans / 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 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Borrowings |  |  | 95,000,000 egbn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |
Goodwill |  |  | 102,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |
Business Combination, Fair Value Credit Mark on Loan Portfolio |  |  | $ 12,500,000 egbn_BusinessCombinationFairValueCreditMarkOnLoanPortfolio / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |  |
Minimum [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Loan Period |  | 30 days |  |  |
Maximum [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Loan Period |  |  |  | 90 days |
Eagle Commercial Ventures, LLC [Member] |  |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |
Number of Higher Risk Lending Transactions Outstanding | 4 egbn_NumberOfHigherRiskLendingTransactionsOutstanding / dei_LegalEntityAxis = egbn_EagleCommercialVenturesLLCMember | 6 egbn_NumberOfHigherRiskLendingTransactionsOutstanding / dei_LegalEntityAxis = egbn_EagleCommercialVenturesLLCMember |  |  |

X
- Definition Represents a decrease in the loan portfolio due to a fair value credit mark as the result of a business acquisition. + 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 Period of time between origination and maturity of a loan, 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 The number of higher risk lending transactions outstanding. + References No definition available. + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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