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Note 10 - Borrowings (Details) (USD $)	16 Months Ended	37 Months Ended	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Sep. 02, 2013	Dec. 31, 2014	Aug. 05, 2014	Dec. 31, 2013
Note 10 - Borrowings (Details) [Line Items]
Long-term Line of Credit	$ 105,895,000us-gaap_LineOfCredit		105,895,000us-gaap_LineOfCredit		$ 79,786,000us-gaap_LineOfCredit
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	185,300,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch		185,300,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
Subordinated Debt	9,300,000us-gaap_SubordinatedDebt		9,300,000us-gaap_SubordinatedDebt
Subordinated Borrowing, Interest Rate	8.50%us-gaap_SubordinatedBorrowingInterestRate	10.00%us-gaap_SubordinatedBorrowingInterestRate
Phase Out of New Notes Capital Treatment	20.00%egbn_PhaseOutOfNewNotesCapitalTreatment		20.00%egbn_PhaseOutOfNewNotesCapitalTreatment
Subordinated Notes [Member] | Current Yield on 5 Year U.S. Treasury Note [Member]
Note 10 - Borrowings (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate			7.03%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember / us-gaap_VariableRateAxis = egbn_CurrentYieldOn5YearUSTreasuryNoteMember
Subordinated Notes [Member]
Note 10 - Borrowings (Details) [Line Items]
Proceeds from Issuance of Long-term Debt				70,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember
Debt Instrument, Interest Rate, Stated Percentage				5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember
Proceeds from Issuance of Subordinated Long-term Debt				68,800,000us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember
Deferred Finance Costs, Net				1,200,000us-gaap_DeferredFinanceCostsNet / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember
Federal Funds [Member]
Note 10 - Borrowings (Details) [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	137,500,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_DebtInstrumentAxis = egbn_FederalFundsMember		137,500,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_DebtInstrumentAxis = egbn_FederalFundsMember
Federal Funds [Member]
Note 10 - Borrowings (Details) [Line Items]
Long-term Line of Credit	0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_FederalFundsMember		0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_FederalFundsMember
CDARS [Member]
Note 10 - Borrowings (Details) [Line Items]
Long-term Line of Credit	14,300,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_CDARSMember		14,300,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_CDARSMember
Line of Credit Facility, Maximum Borrowing Capacity	784,400,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_CDARSMember		784,400,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_CDARSMember
IND [Member]
Note 10 - Borrowings (Details) [Line Items]
Long-term Line of Credit	246,900,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_INDMember		246,900,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_INDMember
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_INDMember		300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_INDMember
Federal Reserve Bank of Richmond [Member]
Note 10 - Borrowings (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	409,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_FederalReserveBankOfRichmondMember		409,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_FederalReserveBankOfRichmondMember
Loan Agreement and Related Stock Security Agreement [Member] | Prime Rate [Member]
Note 10 - Borrowings (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember
Loan Agreement and Related Stock Security Agreement [Member]
Note 10 - Borrowings (Details) [Line Items]
Long-term Line of Credit	0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember		0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember		0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember
Line of Credit Facility, Maximum Borrowing Capacity	50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember		50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum			3.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember
Maximum [Member]
Note 10 - Borrowings (Details) [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 576,400,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch / us-gaap_RangeAxis = us-gaap_MaximumMember		576,400,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch / us-gaap_RangeAxis = us-gaap_MaximumMember

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The rate at which the capital treatment of the notes must be phased out.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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Amount of advances from the Federal Home Loan Bank (FHLB).

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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