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Note 6 - Interest Rate Swap Derivatives (Details) - Fair values of Derivative (Parentheticals) - Other Liabilities [Member] | Sep. 30, 2015
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Interest Rate Swap 1 [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Derivative [Line Items] |
Receive Rate | 10.00%
Interest Rate Swap 2 [Member] | Federal Funds Effective Swap Rate [Member] |
Derivative [Line Items] |
Receive Rate | 10.00%
Interest Rate Swap 3 [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Derivative [Line Items] |
Receive Rate | 10.00%

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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=egbn_InterestRateSwap1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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