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Note 12 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value On a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value on a recurring basis |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value on a recurring basis | 56,364 | 56,975
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value on a recurring basis |  |
US Government Agencies Debt Securities [Member] |  |
Assets measured at fair value on a recurring basis | 56,364 | 56,975
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value on a recurring basis | 266,035 | 297,241
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Residential Mortgage Backed Securities [Member] |  |
Assets measured at fair value on a recurring basis | 266,035 | 297,241
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value on a recurring basis |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value on a recurring basis | 99,877 | 118,381
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value on a recurring basis |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Assets measured at fair value on a recurring basis | 99,877 | 118,381
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value on a recurring basis | 8,054 | 14,938
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Corporate Debt Securities [Member] |  |
Assets measured at fair value on a recurring basis | 8,054 | 14,938
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value on a recurring basis | 119 | 115
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value on a recurring basis | 219 | 219
Equity Securities [Member] |  |
Assets measured at fair value on a recurring basis | 338 | 334
Residential Mortgage Loan Long Term [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Residential Mortgage Loan Long Term [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value on a recurring basis | 78,118 | 47,492
Residential Mortgage Loan Long Term [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Residential Mortgage Loan Long Term [Member] |  |
Assets measured at fair value on a recurring basis | 78,118 | 47,492
Mortgage Banking Derivative [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Mortgage Banking Derivative [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value on a recurring basis |  |
Mortgage Banking Derivative [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value on a recurring basis | 217 | 24
Mortgage Banking Derivative [Member] |  |
Assets measured at fair value on a recurring basis | 217 | 24
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member] |  |
Liabilities measured at fair value on a recurring basis |  |
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities measured at fair value on a recurring basis |  |
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] |  |
Liabilities measured at fair value on a recurring basis |  |
Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value on a recurring basis | 119 | 115
Liabilities measured at fair value on a recurring basis |  |
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member] |  |
Liabilities measured at fair value on a recurring basis |  |
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities measured at fair value on a recurring basis | 9,030 | 1,417
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] |  |
Liabilities measured at fair value on a recurring basis |  |
Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value on a recurring basis | 508,448 | 535,027
Liabilities measured at fair value on a recurring basis | 9,030 | 1,417
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member] |  |
Liabilities measured at fair value on a recurring basis | 222 |
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities measured at fair value on a recurring basis |  |
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] |  |
Liabilities measured at fair value on a recurring basis |  | 30
Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value on a recurring basis | 436 | 243
Liabilities measured at fair value on a recurring basis | 222 | 30
Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member] |  |
Liabilities measured at fair value on a recurring basis | 222 |
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities measured at fair value on a recurring basis | 9,030 | 1,417
Derivative Financial Instruments, Liabilities [Member] |  |
Liabilities measured at fair value on a recurring basis |  | 30
Assets measured at fair value on a recurring basis | 509,003 | 535,385
Liabilities measured at fair value on a recurring basis | $ 9,252 | $ 1,447

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=egbn_ResidentialMortgageLoanLongTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=egbn_MortgageBankingDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=egbn_MortgageBankingDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |