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Note 21 - Commitments and Contingent Liabilities (Details Textual) - George Mason Sponsorship [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Termination Option One [Member] |
Increase (Decrease) in Contractual Obligation, Termination Option | $ 3.5
Termination Option One [Member] | Minimum [Member] |
Contractual Obligation, Option Period | 11 years
Termination Option One [Member] | Maximum [Member] |
Contractual Obligation, Option Period | 15 years
Termination Option Two [Member] |
Increase (Decrease) in Contractual Obligation, Termination Option | $ 3.6
Termination Option Two [Member] | Minimum [Member] |
Contractual Obligation, Option Period | 16 years
Termination Option Two [Member] | Maximum [Member] |
Contractual Obligation, Option Period | 20 years
Effective June 30, 2025 [Member] |
Option to Terminate | 10 years
Effective June 30, 2030 [Member] |
Option to Terminate | 15 years

X
- Definition Represents the option period for a contractual obligation. + References No definition available. + Details
Name: | egbn_ContractualObligationOptionPeriod
Namespace Prefix: | egbn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in contractual obligations if the contract is terminated. + References No definition available. + Details
Name: | egbn_IncreaseDecreaseInContractualObligationTerminationOption
Namespace Prefix: | egbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of time, after which, the company has the option to terminate the agreement. + References No definition available. + Details
Name: | egbn_OptionToTerminate
Namespace Prefix: | egbn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=egbn_TerminationOptionOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=egbn_TerminationOptionTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=egbn_EffectiveJune302025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=egbn_EffectiveJune302030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |