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Note 8 - Long-term Borrowings - Summary of Long-term Borrowings (Details) (Parentheticals)	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Subordinated Notes, 5.75% [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.75%	5.75%	5.75%
Subordinated Notes, 5.0% [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%	5.00%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=egbn_SubordinatedNotes50Member
Namespace Prefix:
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