Loans and Allowance for Credit Losses - Detail activity in the allowance for credit losses by portfolio segment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 71,505	$ 102,070	$ 74,965	$ 109,579
Loans charged-off	(1,396)	(5,757)	(1,910)	(11,114)
Recoveries of loans previously charged-off	2,070	158	2,125	267
Net loans (charged-off) recovered	674	(5,599)	215	(10,847)
Provision for (reversal of) credit losses	486	(3,911)	(2,515)	(6,172)
Ending Balance	72,665	92,560	72,665	92,560
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,946	23,701	14,475	26,569
Loans charged-off	(38)	(1,541)	(552)	(5,691)
Recoveries of loans previously charged-off	442	150	496	246
Net loans (charged-off) recovered	404	(1,391)	(56)	(5,445)
Provision for (reversal of) credit losses	2,404	(962)	1,335	224
Ending Balance	15,754	21,348	15,754	21,348
Income-producing - commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	39,193	51,510	38,287	55,385
Loans charged-off	0	(4,216)	0	(5,216)
Recoveries of loans previously charged-off	0	0	0	0
Net loans (charged-off) recovered	0	(4,216)	0	(5,216)
Provision for (reversal of) credit losses	(5,073)	(1,324)	(4,167)	(4,199)
Ending Balance	34,120	45,970	34,120	45,970
Owner-occupied - commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,515	14,315	12,146	14,000
Loans charged-off	(1,355)	0	(1,355)	0
Recoveries of loans previously charged-off	0	0	0	0
Net loans (charged-off) recovered	(1,355)	0	(1,355)	0
Provision for (reversal of) credit losses	3,636	(1,320)	2,005	(1,005)
Ending Balance	12,796	12,995	12,796	12,995
Real estate mortgage - residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	381	919	449	1,020
Loans charged-off	0	0	0	0
Recoveries of loans previously charged-off	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Provision for (reversal of) credit losses	409	(37)	341	(138)
Ending Balance	790	882	790	882
Construction - commercial and residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,973	10,683	9,099	11,529
Loans charged-off	0	0	0	(206)
Recoveries of loans previously charged-off	1,627	6	1,627	6
Net loans (charged-off) recovered	1,627	6	1,627	(200)
Provision for (reversal of) credit losses	(1,106)	(262)	(2,232)	(902)
Ending Balance	8,494	10,427	8,494	10,427
Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	467	907	474	1,039
Loans charged-off	0	0	0	0
Recoveries of loans previously charged-off	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Provision for (reversal of) credit losses	180	(10)	173	(142)
Ending Balance	647	897	647	897
Other consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	30	35	35	37
Loans charged-off	(3)	0	(3)	(1)
Recoveries of loans previously charged-off	1	2	2	15
Net loans (charged-off) recovered	(2)	2	(1)	14
Provision for (reversal of) credit losses	36	4	30	(10)
Ending Balance	$ 64	$ 41	$ 64	$ 41

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

Name:	us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after recoveries, of loans and leases that have been written-off.

+ References

No definition available.

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (c)

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (1)

+ Details

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

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_ProvisionForLoanAndLeaseLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=egbn_IncomeProducingPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=egbn_OwnerOccupiedPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=egbn_ConstructionPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=egbn_HomeEquityPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=egbn_OtherConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: