This item represents the amortization period for loans.

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This item represents the frequency of interest rate adjustments.

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This item represents the length of time that the loan is in place.

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Percent of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Loans acquired in a business combination, at fair value of the receivables acquired, for both loans transferred in and otherwise accounted for.

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This item represents the estimated increase in interest rates for performing the Company's stress tests.

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Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Note 5 - Loans and Allowance for Credit Losses (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2014
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans and Leases Receivable, Deferred Income	$ 15,600,000	$ 12,700,000
Servicing Asset at Fair Value, Amount	67,900,000us-gaap_ServicingAssetAtFairValueAmount	67,600,000us-gaap_ServicingAssetAtFairValueAmount
Stress Test Assumption Increase Interest Rates	2.00%
Financing Receivable, Net	4,312,399,000us-gaap_NotesReceivableNet	2,945,158,000us-gaap_NotesReceivableNet
Loan Percent	100.00%egbn_LoanPercent	100.00%egbn_LoanPercent
Financing Receivable, Modifications, Recorded Investment	8,000,000	1,200,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	8
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	11,600,000
Financing Receivable, Modifications, Number of Contracts	4	1
Performing Under Restructured Terms [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	13,500,000	7,900,000
Home Equity Line of Credit [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans and Leases Receivable, Deferred Income	182,000	235,000
Percent Of Loan Portfolio	6.00%
Financing Receivable, Net	122,536,000	110,242,000
Commercial Real Estate Owner Occupied [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	12.00%
Financing Receivable, Net	461,581,000	317,491,000
Commercial Real Estate and Real Estate Construction Loans [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	70.00%
Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	58.00%
Commercial Loan [Member] \| Preferred Term [Member] \| Maximum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	7 years
Commercial Loan [Member] \| Preferred Term [Member] \| Minimum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	5 years
Commercial Loan [Member] \| Maximum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	10 years
Amortization Term	25 years
Commercial Loan [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	21.00%
Financing Receivable, Net	916,226,000	694,350,000
SBA Loans [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	2.00%
Residential Mortgage Loan [Member] \| Maximum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	10 years
Residential Mortgage Loan [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	3.00%
Commercial Land Acquisition Loans [Member] \| Maximum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	24 months
ADC Loans [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Net	851,500,000
Loan Percent	31.00%
Nonaccrual Loans [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,700,000
Loans Not Impaired [Member] \| Virginia Heritage Bank [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans Fair Value at Acquisition	801,000,000
Nonaccrual Loans Current and in Accordance with Original Terms [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Impaired Financing Receivable, Interest Income, Accrual Method	1,500,000
Sold [Member] \| Nonperforming Financing Receivable [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,100,000
Financing Receivable, Modifications, Number of Contracts	4
Reclassified to OREO [Member] \| Nonperforming Financing Receivable [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,000,000
Financing Receivable, Modifications, Number of Contracts	1
Paid Off [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	217,000
Reclassified to Nonperforming Loans [Member] \| Nonperforming Financing Receivable [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	227,000
Financing Receivable, Modifications, Number of Contracts	1
Charged Off [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	95,000
Financing Receivable, Modifications, Number of Contracts	1
Construction Loans [Member] \| Maximum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	36 months
Construction Loans [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Net	851,464,000	608,826,000
Nonperforming Financing Receivable [Member] \| Virginia Heritage Bank [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	2,900,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	4,000,000
Nonperforming Financing Receivable [Member] \| Fidelity [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	529,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	586,000
Virginia Heritage Bank [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans Fair Value at Acquisition	804,320,000		800,000,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	4,448,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	2,900,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	$ 0
Maximum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loan To Value Ratio	80.00%
Minimum [Member]
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items]
Minimum Debt Service Coverage	1.15
Interest Rate Adjustment Frequency	5 years