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

Aggregate amount of interest expense on all deposits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.6)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Name:	us-gaap_InterestExpenseDeposits
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The aggregate interest expense incurred on the following for deposits in domestic offices: (1) transaction accounts (NOW, and telephone and preauthorized transfer accounts), (2) money market deposits and (3) savings deposits.

Name:	us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Interest expense incurred on time deposits, including certificates of deposits, of $100,000 or more in domestic offices.

Name:	us-gaap_InterestExpenseTimeDeposits100000OrMore
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Interest expense incurred on time deposits, including certificates of deposits, less than $100,000 in domestic offices.