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Leases - Narrative (Details) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) lease | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($)
Leases [Abstract] |  |  |
Operating lease right-of-use assets | $ 29,066 | $ 25,237 | $ 25,368
Operating lease liabilities | $ 31,662 | $ 28,022 |
Probability that lease options will be exercised | 90.00% |  |
Number of operating leases signed but not yet commenced | lease | 0 |  |

X
- Definition Number of lessee's operating leases that are signed but have not yet commenced. + References No definition available. + Details
Name: | egbn_LesseeOperatingLeaseNumberOfLeasesNotYetCommenced
Namespace Prefix: | egbn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent probability of option to extend lease. + References No definition available. + Details
Name: | egbn_LesseeOperatingLeaseOptionToExtendPercent
Namespace Prefix: | egbn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant