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Deposits - Remaining maturity of time deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deposits Liabilities, Balance Sheet, Reported Amounts [Abstract] |  |
Three months or less | $ 201,312 | $ 260,028
More than three months through twelve months | 325,329 | 538,352
Over twelve months | 451,119 | 484,659
Total | $ 977,760 | $ 1,283,039

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- Definition Contractual maturities time deposits after12 months. + 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 Contractual maturities time deposits three months or less. + References No definition available. + Details
Name: | egbn_ContractualMaturitiesTimeDepositsThreeMonthsOrLess
Namespace Prefix: | egbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual maturities time deposits three months through 12 months. + References No definition available. + Details
Name: | egbn_ContractualMaturitiesTimeDepositsThreeMonthsThrough12Months
Namespace Prefix: | egbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DepositsLiabilitiesBalanceSheetReportedAmountsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of time deposit liabilities, including certificates of deposit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_TimeDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant