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Note 10 - Fair Value Measurements (Details) - Assets Measured at Fair Value Based on Significant Unobservable Inputs (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance, assets	$ 365us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	$ 219us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Ending balance, assets	438us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	365us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Beginning balance, liabilities	(250)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Realized gain (loss) included in earnings - net derivatives	110us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	(250)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Principal redemption	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Ending balance, liabilities	(140)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	(250)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Realized gain (loss) included in earnings - net derivatives	110us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	(250)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Principal redemption	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Realized and unrealized gain (loss) included in earnings - net derivatives	73us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	146us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Principal redemption	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Equity Investment Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance, assets	219us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = egbn_EquityInvestmentOtherMember	219us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = egbn_EquityInvestmentOtherMember
Ending balance, assets	219us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = egbn_EquityInvestmentOtherMember	219us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = egbn_EquityInvestmentOtherMember
Realized and unrealized gain (loss) included in earnings - net derivatives	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FinancialInstrumentAxis = egbn_EquityInvestmentOtherMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FinancialInstrumentAxis = egbn_EquityInvestmentOtherMember
Principal redemption	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FinancialInstrumentAxis = egbn_EquityInvestmentOtherMember
Derivative Assets and Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance, assets	146us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember
Ending balance, assets	219us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember	146us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember
Beginning balance, liabilities	(250)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember
Realized gain (loss) included in earnings - net derivatives	110us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember	(250)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember
Principal redemption	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember
Ending balance, liabilities	(140)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember	(250)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember
Realized gain (loss) included in earnings - net derivatives	110us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember	(250)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember
Principal redemption	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember
Realized and unrealized gain (loss) included in earnings - net derivatives	73us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember	146us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember
Principal redemption	$ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FinancialInstrumentAxis = egbn_DerivativeAssetsAndLiabilitiesMember

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+ References

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