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Note 6 - Premises and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 6 - Premises and Equipment (Details) [Line Items]
Depreciation	$ 4,600,000us-gaap_Depreciation	$ 3,900,000us-gaap_Depreciation	$ 3,100,000us-gaap_Depreciation
Number of Stores			33us-gaap_NumberOfStores
Lessor Leasing Arrangements, Operating Leases, Renewal Term	5 years
Operating Leases, Rent Expense, Net	7,500,000us-gaap_OperatingLeasesRentExpenseNet	6,900,000us-gaap_OperatingLeasesRentExpenseNet	6,100,000us-gaap_OperatingLeasesRentExpenseNet
Reduction of Rent Expense	$ 114,000egbn_ReductionOfRentExpense	$ 57,000egbn_ReductionOfRentExpense	$ 99,000egbn_ReductionOfRentExpense
Minimum [Member]
Note 6 - Premises and Equipment (Details) [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	5 years
Maximum [Member]
Note 6 - Premises and Equipment (Details) [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	10 years

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- Definition

Represents a reduction to rent expense.

+ References

No definition available.

+ Details

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Term of the lessor's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Represents the number of stores.

+ References

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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