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Note 9 - Deposits (Details) - Interest Expense on Deposits (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Expense on Deposits [Abstract]
Interest bearing transaction	$ 178egbn_InterestExpenseInterestBearingTransactionDeposits	$ 298egbn_InterestExpenseInterestBearingTransactionDeposits	$ 289egbn_InterestExpenseInterestBearingTransactionDeposits
Savings and money market	6,265us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	5,765us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	5,946us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits
Time, $100,000 or more	2,830us-gaap_InterestExpenseTimeDeposits100000OrMore	2,080us-gaap_InterestExpenseTimeDeposits100000OrMore	2,729us-gaap_InterestExpenseTimeDeposits100000OrMore
Other time	365us-gaap_InterestExpenseTimeDepositsLessThan100000	2,471us-gaap_InterestExpenseTimeDepositsLessThan100000	3,093us-gaap_InterestExpenseTimeDepositsLessThan100000
Total	$ 9,638us-gaap_InterestExpenseDeposits	$ 10,614us-gaap_InterestExpenseDeposits	$ 12,057us-gaap_InterestExpenseDeposits

X

- Definition

The interest expense on interest bearing transaction deposits.

+ References

No definition available.

+ Details

Name:	egbn_InterestExpenseInterestBearingTransactionDeposits
Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Definition

Aggregate amount of interest expense on all deposits.

+ References

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

+ Details

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

X

- Definition

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.

+ References

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

+ Details

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

X

- Definition

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

+ References

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

+ Details

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

X

- Definition

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

+ References

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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