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Note 21 - Commitments and Contingent Liabilities (Details) - Commitment Payment Schedule - George Mason Sponsorship [Member]	12 Months Ended
	Dec. 31, 2015 USD ($)
Note 21 - Commitments and Contingent Liabilities (Details) - Commitment Payment Schedule [Line Items]
1-5	$ 650,000
6-10	675,000
11-15	700,000
16-20	$ 725,000

X

- Definition

Amount of fee, paid annually from the 11th year to the 15th year of the agreement.

+ References

No definition available.

+ Details

Name:	egbn_AnnualFeeContractYear11To15
Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of fee, paid annually from the 16th year to the 20th year of the agreement.

+ References

No definition available.

+ Details

Name:	egbn_AnnualFeeContractYear16To20
Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of fee, paid annually from the 1st year to the 5th year of the agreement.

+ References

No definition available.

+ Details

Name:	egbn_AnnualFeeContractYear1To5
Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of fee, paid annually from the 6th year to the 10th year of the agreement.

+ References

No definition available.

+ Details

Name:	egbn_AnnualFeeContractYear6To10
Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	egbn_Note21CommitmentsandContingentLiabilitiesDetailsCommitmentPaymentScheduleLineItems
Namespace Prefix:	egbn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=egbn_GeorgeMasonSponsorshipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: