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Note 1 - Summary of Significant Accounting Policies (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 14, 2013 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2012
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Number of Stores |  |  |  | 33 us-gaap_NumberOfStores
Trading Securities |  |  | 0 us-gaap_TradingSecurities |
Held-to-maturity Securities |  |  | 0 us-gaap_HeldToMaturitySecurities |
Deferred Tax Assets, Valuation Allowance |  | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance |
Common Stock Dividend Rate | 10.00%egbn_CommonStockDividendRate | 10.00%egbn_CommonStockDividendRate |  |
Furniture and Fixtures [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 7 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 |
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 |
Banking Services [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Number of Stores |  |  | 22 us-gaap_NumberOfStores / us-gaap_ProductOrServiceAxis = egbn_BankingServicesMember |
Lending Services [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Number of Stores |  |  | 5 us-gaap_NumberOfStores / us-gaap_ProductOrServiceAxis = egbn_LendingServicesMember |
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 |
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 |
Risk Level, High [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Interest Income, Other |  | 0 us-gaap_InterestIncomeOther / us-gaap_InternalCreditAssessmentAxis = us-gaap_RiskLevelHighMember | 0 us-gaap_InterestIncomeOther / us-gaap_InternalCreditAssessmentAxis = us-gaap_RiskLevelHighMember | 0 us-gaap_InterestIncomeOther / us-gaap_InternalCreditAssessmentAxis = us-gaap_RiskLevelHighMember
Loans Receivable, Net |  | $ 6,200,000 us-gaap_LoansReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_RiskLevelHighMember | 7,400,000 us-gaap_LoansReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_RiskLevelHighMember |
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 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + 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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