Loans and Allowance for Credit Losses - Schedule of Detail Activity in the Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 106,301	$ 78,029	$ 85,940	$ 85,940	$ 74,444	$ 74,444
Loans charged-off	(5,380)	(467)		(29,496)	(7,320)	(19,523)
Recoveries of loans previously charged-off	77	127		476	406
Net loans (charged-off) recovered	(5,303)	(340)		(29,020)	(6,914)
Provision for (reversal of) credit losses	10,869	5,643		54,947	15,802
Ending Balance	111,867	83,332	106,301	111,867	83,332	85,940
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	21,011	15,374	17,824	17,824	15,655	15,655
Loans charged-off	(1,563)	(467)		(4,150)	(1,828)	(2,020)
Recoveries of loans previously charged-off	53	103		220	335
Net loans (charged-off) recovered	(1,510)	(364)		(3,930)	(1,493)
Provision for (reversal of) credit losses	802	1,327		6,409	2,175
Ending Balance	20,303	16,337	21,011	20,303	16,337	17,824
Income-producing - commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	53,251	38,486	40,050	40,050	35,688	35,688
Loans charged-off	0	0		(21,329)	(5,306)	(11,817)
Recoveries of loans previously charged-off	0	0		185	0
Net loans (charged-off) recovered	0	0		(21,144)	(5,306)
Provision for (reversal of) credit losses	61	2,207		34,406	10,311
Ending Balance	53,312	40,693	53,251	53,312	40,693	40,050
Owner-occupied - commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	15,641	12,805	14,333	14,333	12,702	12,702
Loans charged-off	(3,800)	0	0	(3,800)	0
Recoveries of loans previously charged-off	24	23		71	31
Net loans (charged-off) recovered	(3,776)	23		(3,729)	31
Provision for (reversal of) credit losses	8,206	1,424		9,467	1,519
Ending Balance	20,071	14,252	15,641	20,071	14,252	14,333
Real estate mortgage - residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	750	811	861	861	969	969
Loans charged-off	0	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	(12)	53		(123)	(105)
Ending Balance	738	864	750	738	864	861
Construction - commercial and residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,510	8,018	10,198	10,198	7,195	7,195
Loans charged-off	0	0		(129)	(136)	(5,636)
Recoveries of loans previously charged-off	0	0		0	34
Net loans (charged-off) recovered	0	0		(129)	(102)
Provision for (reversal of) credit losses	1,907	615		5,348	1,540
Ending Balance	15,417	8,633	13,510	15,417	8,633	10,198
Construction - C&I (Owner-Occupied)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,431	1,914	1,992	1,992	1,606	1,606
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	(134)	(20)		(695)	288
Ending Balance	1,297	1,894	1,431	1,297	1,894	1,992
Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	677	595	657	657	555	555
Loans charged-off	0	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	23	39		43	79
Ending Balance	700	634	677	700	634	657
Other consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	30	26	25	25	74	74
Loans charged-off	(17)	0		(88)	(50)	(50)
Recoveries of loans previously charged-off	0	1		0	6
Net loans (charged-off) recovered	(17)	1		(88)	(44)
Provision for (reversal of) credit losses	16	(2)		92	(5)
Ending Balance	$ 29	$ 25	$ 30	$ 29	$ 25	$ 25

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

No definition available.

Name:	us-gaap_AllowanceForLoanAndLeaseLossesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (1)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

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

- Definition

Amount of increase (decrease) in allowance for credit loss on financing receivable.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ References

+ Details

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

- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

+ Details

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

- Definition

Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery
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_ConstructionCIOwnerOccupiedMember
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: