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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 | $ 4,600,000 us-gaap_Depreciation | $ 3,900,000 us-gaap_Depreciation | $ 3,100,000 us-gaap_Depreciation
Number of Stores |  |  | 33 us-gaap_NumberOfStores
Lessor Leasing Arrangements, Operating Leases, Renewal Term | 5 years |  |
Operating Leases, Rent Expense, Net | 7,500,000 us-gaap_OperatingLeasesRentExpenseNet | 6,900,000 us-gaap_OperatingLeasesRentExpenseNet | 6,100,000 us-gaap_OperatingLeasesRentExpenseNet
Reduction of Rent Expense | $ 114,000 egbn_ReductionOfRentExpense | $ 57,000 egbn_ReductionOfRentExpense | $ 99,000 egbn_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 + Details
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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. + Details
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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. + Details
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- Definition Represents the number of stores. + References No definition available. + Details
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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 + Details
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