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

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- 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

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

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- 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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Balance Type: | debit
Period Type: | duration

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- 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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Period Type: | duration

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- 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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- 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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