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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		$ 12,269,000us-gaap_CashSurrenderValueOfLifeInsurance	$ 11,277,000us-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		12,300,000us-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	11,400,000us-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	67egbn_RetirementAge / us-gaap_PlanNameAxis = egbn_SupplementalExecutiveRetirementAndDeathBenefitAgreementsMember
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	6 years
Retirement Plan, Monthly Installments	180egbn_RetirementPlanMonthlyInstallments / us-gaap_PlanNameAxis = egbn_SupplementalExecutiveRetirementAndDeathBenefitAgreementsMember
Defined Benefit Plan, Net Periodic Benefit Cost		$ 255,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = egbn_SupplementalExecutiveRetirementAndDeathBenefitAgreementsMember

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- Definition

Age for retirement for calculation of benefit under SERP Agreements.

+ References

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- Definition

Number of monthly installments, under the SERP Agreements.

+ References

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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.

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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

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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



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-Publisher FASB

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-Paragraph 1

-Subparagraph (h)

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- Definition

Other investments not otherwise specified in the taxonomy.

+ 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 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

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-Number 210

-Section 02

-Paragraph 12

-Article 5



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(f,g))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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

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