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Note 11 - Supplemental Executive Retirement Plan (Details) (USD $) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 28, 2013 | Mar. 31, 2015 | Dec. 31, 2014
Note 11 - Supplemental Executive Retirement Plan (Details) [Line Items] |  |  |
Cash Surrender Value of Life Insurance |  | $ 12,269,000 us-gaap_CashSurrenderValueOfLifeInsurance | $ 11,277,000 us-gaap_CashSurrenderValueOfLifeInsurance
Purchased Fixed Annuity for Financing Retirement Benefits [Member] | Other Assets [Member] | Supplemental Executive Retirement and Death Benefit Agreements [Member] |  |  |
Note 11 - Supplemental Executive Retirement Plan (Details) [Line Items] |  |  |
Cash Surrender Value of Life Insurance |  | 12,300,000 us-gaap_CashSurrenderValueOfLifeInsurance / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_InvestmentTypeAxis = egbn_PurchasedFixedAnnuityForFinancingRetirementBenefitsMember / us-gaap_PlanNameAxis = egbn_SupplementalExecutiveRetirementAndDeathBenefitAgreementsMember |
Purchased Fixed Annuity for Financing Retirement Benefits [Member] | Supplemental Executive Retirement and Death Benefit Agreements [Member] |  |  |
Note 11 - Supplemental Executive Retirement Plan (Details) [Line Items] |  |  |
Other Investments | 11,400,000 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = egbn_PurchasedFixedAnnuityForFinancingRetirementBenefitsMember / us-gaap_PlanNameAxis = egbn_SupplementalExecutiveRetirementAndDeathBenefitAgreementsMember |  |
Supplemental Executive Retirement and Death Benefit Agreements [Member] |  |  |
Note 11 - Supplemental Executive Retirement Plan (Details) [Line Items] |  |  |
Time Period for Calculating Base Salary Under SERP Agreements | 5 years |  |
Retirement Age | 67 egbn_RetirementAge / us-gaap_PlanNameAxis = egbn_SupplementalExecutiveRetirementAndDeathBenefitAgreementsMember |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 6 years |  |
Retirement Plan, Monthly Installments | 180 egbn_RetirementPlanMonthlyInstallments / us-gaap_PlanNameAxis = egbn_SupplementalExecutiveRetirementAndDeathBenefitAgreementsMember |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  | $ 255,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = egbn_SupplementalExecutiveRetirementAndDeathBenefitAgreementsMember |

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- Definition Base salary for benefit under Supplement Executive Retirement and Death Benefit Agreements, time period used to calculate. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + 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 210.5-02.17) -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 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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