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Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data | Series C Preferred Stock [Member] Preferred Stock [Member] | Series C Preferred Stock [Member] | Preferred Stock [Member] | Common Stock [Member] | Warrant [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
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Balance at Dec. 31, 2011 |  |  | $ 56,600 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 197 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 946 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | $ 132,670 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 71,423 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 4,875 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 266,711 us-gaap_StockholdersEquity
Net Income |  |  |  |  |  |  | 35,289 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 35,289 us-gaap_NetIncomeLoss
Net change in other comprehensive income |  |  |  |  |  |  |  | 590 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 590 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Stock-based compensation |  |  |  |  |  | 2,495 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 2,495 us-gaap_ShareBasedCompensation
Exercise of options for 167,882 shares of common stock |  |  |  | 3 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 1,682 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,685 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Common stock issued |  |  |  | 26 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 42,930 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 42,956 us-gaap_ProceedsFromIssuanceInitialPublicOffering
Tax benefits related to non-qualified stock compensation |  |  |  |  |  | 369 us-gaap_DeferredTaxExpenseFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 369 us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Employee stock purchase plan |  |  |  |  |  | 447 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 447 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Preferred stock dividends |  |  |  |  |  |  | (566)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (566)us-gaap_DividendsPreferredStock
Balance at Dec. 31, 2012 |  |  | 56,600 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 226 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 946 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 180,593 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 106,146 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 5,465 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 349,976 us-gaap_StockholdersEquity
Net Income |  |  |  |  |  |  | 47,007 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 47,007 us-gaap_NetIncomeLoss
Net change in other comprehensive income |  |  |  |  |  |  |  | (8,784)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (8,784)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
10% common stock dividend 2,340,518 shares (in Shares) |  |  |  | 24 us-gaap_CommonStockDividendsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 56,159 us-gaap_CommonStockDividendsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (56,183)us-gaap_CommonStockDividendsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Cash paid in lieu of fractional shares |  |  |  |  |  |  | (11)egbn_PaymentsInLieuOfFractionalShares / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (11)egbn_PaymentsInLieuOfFractionalShares
Stock-based compensation |  |  |  |  |  | 3,304 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 3,304 us-gaap_ShareBasedCompensation
Common stock issued |  |  |  | 3 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 1,981 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,984 us-gaap_ProceedsFromIssuanceInitialPublicOffering
Tax benefits related to non-qualified stock compensation |  |  |  |  |  | 410 us-gaap_DeferredTaxExpenseFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 410 us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Employee stock purchase plan |  |  |  |  |  | 543 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 543 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Preferred stock dividends |  |  |  |  |  |  | (566)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (566)us-gaap_DividendsPreferredStock
Balance at Dec. 31, 2013 |  |  | 56,600 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 253 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 946 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 242,990 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 96,393 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (3,319)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 393,863 us-gaap_StockholdersEquity
Net Income |  |  |  |  |  |  | 54,258 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 54,258 us-gaap_NetIncomeLoss
Net change in other comprehensive income |  |  |  |  |  |  |  | 5,966 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 5,966 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Common stock issued to effect merger with Virginia Heritage 4,010,261 shares |  |  |  | 40 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 144,053 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 144,093 us-gaap_StockIssuedDuringPeriodValueAcquisitions
Stock-based compensation |  |  |  |  |  | 3,981 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 3,981 us-gaap_ShareBasedCompensation
Common stock issued |  |  |  | 3 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 2,310 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 2,313 us-gaap_ProceedsFromIssuanceInitialPublicOffering
Tax benefits related to non-qualified stock compensation |  |  |  |  |  | 978 us-gaap_DeferredTaxExpenseFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 978 us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Employee stock purchase plan |  |  |  |  |  | 621 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 621 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Issurance of Series C Preferred Stock | 15,300 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 15,300 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  | (614)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (614)us-gaap_DividendsPreferredStock
Balance at Dec. 31, 2014 |  |  | $ 71,900 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 296 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 946 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | $ 394,933 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 150,037 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 2,647 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 620,759 us-gaap_StockholdersEquity

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