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Note 10 - Interest Rate Swap Derivatives (Details) - Fair values of Derivative (Parentheticals) - Other Liabilities [Member]	Dec. 31, 2015
Interest Rate Swap 1 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Fair value, receive rate	0.10%
Interest Rate Swap 2 [Member] | Federal Funds Effective Swap Rate [Member]
Derivative [Line Items]
Fair value, receive rate	0.10%
Interest Rate Swap 3 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Fair value, receive rate	0.10%

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=egbn_InterestRateSwap2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=egbn_InterestRateSwap3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: