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Summary of Significant Accounting Policies - Narrative (Details)	Mar. 31, 2022 store
Banking Services
Property, Plant and Equipment [Line Items]
Number of locations	17
Lending Services
Property, Plant and Equipment [Line Items]
Number of locations	5

X

- Definition

Represents the number of stores.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_BankingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=egbn_LendingServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: