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Leases - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) lease	Dec. 31, 2020 USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 30,080	$ 25,237
Operating lease liabilities	$ 34,345	$ 28,022
Probability that lease options will be exercised	90.00%
Number of operating leases signed but not yet commenced | lease	1

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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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=123391704&loc=SL77918627-209977

+ Details

Name:	us-gaap_OperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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=123391704&loc=SL77918627-209977

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant