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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
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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

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- 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
Name: | egbn_ContractualMaturitiesTimeDepositsAfter12Months
Namespace Prefix: | egbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
Name: | egbn_ContractualMaturitiesTimeDepositsSixMonthsThrough12Months
Namespace Prefix: | egbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
Name: | egbn_ContractualMaturitiesTimeDepositsThreeMonthsOrLess
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
Name: | egbn_ContractualMaturitiesTimeDepositsThreeMonthsThroughSixMonths
Namespace Prefix: | egbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | egbn_RemainingMaturityOfTimeDepositsAbstract
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Data Type: | xbrli:stringItemType
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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
Name: | us-gaap_TimeDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant