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Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	$ 33,011,000us-gaap_ImpairedFinancingReceivableRecordedInvestment	$ 35,945,000us-gaap_ImpairedFinancingReceivableRecordedInvestment	$ 44,264,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
Derivative liabilities	140,000us-gaap_DerivativeLiabilities	250,000us-gaap_DerivativeLiabilities	0us-gaap_DerivativeLiabilities
Commercial Loan [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	1,934,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	781,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Commercial Loan [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	6,278,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	7,171,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Commercial Loan [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	11,257,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	12,975,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	17,646,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Commercial Loan [Member] | Estimate of Fair Value Measurement [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	8,212,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	7,952,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Commercial Real Estate Investment [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	1,272,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember	703,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember
Commercial Real Estate Investment [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	450,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember	1,199,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember
Commercial Real Estate Investment [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	9,975,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember	10,494,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember	5,641,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember
Commercial Real Estate Investment [Member] | Estimate of Fair Value Measurement [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	1,722,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember	1,902,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember
Commercial Real Estate Owner Occupied [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	724,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate Owner Occupied [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	590,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember	824,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate Owner Occupied [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	1,867,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember	1,889,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember	7,323,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate Owner Occupied [Member] | Estimate of Fair Value Measurement [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	1,314,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember	824,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Residential Mortgage [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	342,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember	346,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Residential Mortgage [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	342,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember	346,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember	771,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Residential Mortgage [Member] | Estimate of Fair Value Measurement [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	342,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember	346,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Home Equity Line of Credit [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	130,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember	5,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Home Equity Line of Credit [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	565,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember	963,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Home Equity Line of Credit [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	889,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember	1,398,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember	598,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Home Equity Line of Credit [Member] | Estimate of Fair Value Measurement [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	695,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember	968,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Consumer, Other [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	5,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember	13,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember
Consumer, Other [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	10,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember	58,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember	60,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember
Consumer, Other [Member] | Estimate of Fair Value Measurement [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	5,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember	13,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember
Construction Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	3,058,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember	3,297,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember
Construction Loans [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	8,671,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember	8,785,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember	12,225,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember
Construction Loans [Member] | Estimate of Fair Value Measurement [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Impaired loans	3,058,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember	3,297,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember
Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Other real estate owned	9,214,000us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	9,184,000us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total assets measured at fair value on a nonrecurring basis	13,274,000us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	10,673,000us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Other real estate owned	3,124,000us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	4,040,000us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Derivative liabilities	140,000us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	250,000us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total assets measured at fair value on a nonrecurring basis	14,552,000us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	18,103,000us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Estimate of Fair Value Measurement [Member]
Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value on a Nonrecurring Basis [Line Items]
Other real estate owned	12,338,000us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	13,224,000us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Derivative liabilities	140,000us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	250,000us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Total assets measured at fair value on a nonrecurring basis	$ 27,826,000us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	$ 28,776,000us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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