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Note 21 - Commitments and Contingent Liabilities (Details) - Commitment Payment Schedule - George Mason Sponsorship [Member] | 12 Months Ended
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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: |