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Note 11 - Deposits (Details) - Remaining Maturity of Time Deposits - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Remaining Maturity of Time Deposits [Abstract]
Three months or less	$ 88,483	$ 104,482	$ 82,790
More than three months through six months	123,789	106,861	109,101
More than six months through twelve months	234,684	182,187	118,646
Over twelve months	292,299	295,211	135,800
Total	$ 739,255	$ 688,741	$ 446,337

X

- Definition

The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) after twelve months from the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	egbn_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) for the period from six months through twelve months after the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts for three months or less from the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) for the period from three months through six months after the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	egbn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ 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 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant