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Note 2 - Mergers and Acquisitions (Details) - Unaudited Proforma Information (Virginia Heritage Bank [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Virginia Heritage Bank [Member] |  |
Note 2 - Mergers and Acquisitions (Details) - Unaudited Proforma Information [Line Items] |  |
Net interest income | $ 206,721 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember | $ 174,509 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember
Net income | $ 58,756 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember | $ 55,973 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember
Earnings per share: |  |
Basic | $ 1.89 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember | $ 1.86 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember
Diluted | $ 1.82 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember | $ 1.81 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember

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