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Note 12 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value On a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value on a recurring basis
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value on a recurring basis	56,364	56,975
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value on a recurring basis
US Government Agencies Debt Securities [Member]
Assets measured at fair value on a recurring basis	56,364	56,975
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value on a recurring basis
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value on a recurring basis	266,035	297,241
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value on a recurring basis
Residential Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis	266,035	297,241
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value on a recurring basis
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value on a recurring basis	99,877	118,381
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value on a recurring basis
US States and Political Subdivisions Debt Securities [Member]
Assets measured at fair value on a recurring basis	99,877	118,381
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value on a recurring basis
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value on a recurring basis	8,054	14,938
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value on a recurring basis
Corporate Debt Securities [Member]
Assets measured at fair value on a recurring basis	8,054	14,938
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value on a recurring basis	119	115
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value on a recurring basis
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value on a recurring basis	219	219
Equity Securities [Member]
Assets measured at fair value on a recurring basis	338	334
Residential Mortgage Loan Long Term [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value on a recurring basis
Residential Mortgage Loan Long Term [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value on a recurring basis	78,118	47,492
Residential Mortgage Loan Long Term [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value on a recurring basis
Residential Mortgage Loan Long Term [Member]
Assets measured at fair value on a recurring basis	78,118	47,492
Mortgage Banking Derivative [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value on a recurring basis
Mortgage Banking Derivative [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value on a recurring basis
Mortgage Banking Derivative [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value on a recurring basis	217	24
Mortgage Banking Derivative [Member]
Assets measured at fair value on a recurring basis	217	24
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member]
Liabilities measured at fair value on a recurring basis
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member]
Liabilities measured at fair value on a recurring basis
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member]
Liabilities measured at fair value on a recurring basis
Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value on a recurring basis	119	115
Liabilities measured at fair value on a recurring basis
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member]
Liabilities measured at fair value on a recurring basis
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member]
Liabilities measured at fair value on a recurring basis	9,030	1,417
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member]
Liabilities measured at fair value on a recurring basis
Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value on a recurring basis	508,448	535,027
Liabilities measured at fair value on a recurring basis	9,030	1,417
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member]
Liabilities measured at fair value on a recurring basis	222
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member]
Liabilities measured at fair value on a recurring basis
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]
Liabilities measured at fair value on a recurring basis		30
Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value on a recurring basis	436	243
Liabilities measured at fair value on a recurring basis	222	30
Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member]
Liabilities measured at fair value on a recurring basis	222
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member]
Liabilities measured at fair value on a recurring basis	9,030	1,417
Derivative Financial Instruments, Liabilities [Member]
Liabilities measured at fair value on a recurring basis		30
Assets measured at fair value on a recurring basis	509,003	535,385
Liabilities measured at fair value on a recurring basis	$ 9,252	$ 1,447

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring 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.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

+ References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=egbn_ResidentialMortgageLoanLongTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=egbn_MortgageBankingDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=egbn_MortgageBankingDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: