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Note 6 - Interest Rate Swap Derivatives - Fair Values of Derivative (Details) (Parentheticals) - Other Liabilities [Member] | Mar. 31, 2016
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Interest Rate Swap 1 [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Fair value | 10.00%
Interest Rate Swap 2 [Member] | Federal Funds Effective Swap Rate [Member] |
Fair value | 10.00%
Interest Rate Swap 3 [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Fair value | 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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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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
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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: |
Period 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
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