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Note 12 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	10,451	9,201
Commercial Portfolio Segment [Member]
Impaired loans	10,451	9,201
Income Producing Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans
Income Producing Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans
Income Producing Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	12,934	5,085
Income Producing Portfolio Segment [Member]
Impaired loans	12,934	5,085
Owner Occupied Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans
Owner Occupied Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans
Owner Occupied Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	2,157	1,353
Owner Occupied Portfolio Segment [Member]
Impaired loans	2,157	1,353
Residential Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans
Residential Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans
Residential Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	244	329
Residential Portfolio Segment [Member]
Impaired loans	244	329
Construction Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans
Construction Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans
Construction Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	4,578	9,504
Construction Portfolio Segment [Member]
Impaired loans	4,578	9,504
Home Equity Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans
Home Equity Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans
Home Equity Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	13	123
Home Equity Portfolio Segment [Member]
Impaired loans	13	123
Other Consumer Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans
Other Consumer Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans
Other Consumer Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans		19
Other Consumer Portfolio Segment [Member]
Impaired loans		19
Fair Value, Inputs, Level 1 [Member]
Other real estate owned
Total assets measured at fair value on a nonrecurring basis
Fair Value, Inputs, Level 2 [Member]
Other real estate owned
Total assets measured at fair value on a nonrecurring basis
Fair Value, Inputs, Level 3 [Member]
Other real estate owned	5,194	5,852
Total assets measured at fair value on a nonrecurring basis	35,571	31,466
Other real estate owned	5,194	5,852
Total assets measured at fair value on a nonrecurring basis	$ 35,571	$ 31,466

X

- Definition

Fair value amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

No definition available.

+ Details

Name:	egbn_ImpairedFinancingReceivableRecordedInvestmentFairValue
Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=egbn_OwnerOccupiedPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=egbn_ConstructionPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=egbn_HomeEquityPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: