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Note 24 - Parent Company Financial Information (Details) - Condensed Statements of Cash Flows (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Flows From Operating Activities |  |  |
Net Income | $ 54,258,000 us-gaap_NetIncomeLoss | $ 47,007,000 us-gaap_NetIncomeLoss | $ 35,289,000 us-gaap_NetIncomeLoss
Excess tax benefit on stock-based compensation | (978,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (410,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (369,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
(Increase) decrease in other assets | (12,631,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (26,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets | 3,797,000 us-gaap_IncreaseDecreaseInOtherOperatingAssets
Increase (decrease) in other liabilities | 1,856,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 10,850,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 1,818,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash (used in) operating activities | 59,507,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 258,677,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 15,820,000 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows From Investing Activities |  |  |
Net cash used in investing activities | (725,725,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (600,736,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (446,567,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows From Financing Activities |  |  |
Issuance of common stock | 144,093,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  | 42,956,000 us-gaap_ProceedsFromIssuanceOfCommonStock
Issuance of Series C Preferred Stock | 15,300,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock |  |
Cash paid in lieu of fractional shares |  | 11,000 egbn_PaymentsInLieuOfFractionalShares |
Proceeds from exercise of stock options | 2,313,000 us-gaap_ProceedsFromStockOptionsExercised | 1,984,000 us-gaap_ProceedsFromStockOptionsExercised | 1,685,000 us-gaap_ProceedsFromStockOptionsExercised
Preferred stock dividends | (614,000)us-gaap_DividendsPreferredStock | (566,000)us-gaap_DividendsPreferredStock | (566,000)us-gaap_DividendsPreferredStock
Excess tax benefit on stock-based compensation | 978,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 410,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 369,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from employee stock purchase plan | 621,000 us-gaap_ProceedsFromStockPlans | 543,000 us-gaap_ProceedsFromStockPlans | 447,000 us-gaap_ProceedsFromStockPlans
Net cash provided by financing activities | 615,283,000 us-gaap_NetCashProvidedByUsedInFinancingActivities | 309,685,000 us-gaap_NetCashProvidedByUsedInFinancingActivities | 537,670,000 us-gaap_NetCashProvidedByUsedInFinancingActivities
Net Increase in Cash | (50,935,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (32,374,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 106,923,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents | 256,025,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 306,960,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 339,334,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Beginning of Period [Member] | Parent Company [Member] |  |  |
Cash Flows From Financing Activities |  |  |
Cash and Cash Equivalents | 25,833,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CreationDateAxis = egbn_BeginningOfPeriodMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25,518,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CreationDateAxis = egbn_BeginningOfPeriodMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,498,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CreationDateAxis = egbn_BeginningOfPeriodMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
End of Period [Member] | Parent Company [Member] |  |  |
Cash Flows From Financing Activities |  |  |
Cash and Cash Equivalents | 51,549,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CreationDateAxis = egbn_EndOfPeriodMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25,833,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CreationDateAxis = egbn_EndOfPeriodMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25,518,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CreationDateAxis = egbn_EndOfPeriodMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Parent Company [Member] |  |  |
Cash Flows From Operating Activities |  |  |
Net Income | 54,258,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 47,007,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 35,289,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed income of subsidiary | (56,545,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (48,252,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (36,564,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax benefit on stock-based compensation | (978,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (410,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (369,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Increase) decrease in other assets | (1,731,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 353,000 us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (34,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Increase (decrease) in other liabilities | 1,803,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 67,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (50,000)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash (used in) operating activities | (3,193,000)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,235,000)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,728,000)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows From Investing Activities |  |  |
Investment in subsidiary (net) | (203,782,000)us-gaap_PaymentsForProceedsFromInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (810,000)us-gaap_PaymentsForProceedsFromInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (34,143,000)us-gaap_PaymentsForProceedsFromInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in investing activities | (203,782,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (810,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (34,143,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows From Financing Activities |  |  |
Issuance of common stock | 144,093,000 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 42,956,000 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Issuance of Series C Preferred Stock | 15,300,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Issuance in long-term borrowings | 70,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash paid in lieu of fractional shares |  | (11,000)egbn_PaymentsInLieuOfFractionalShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Proceeds from exercise of stock options | 2,313,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,984,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,685,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preferred stock dividends | (614,000)us-gaap_DividendsPreferredStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (566,000)us-gaap_DividendsPreferredStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (566,000)us-gaap_DividendsPreferredStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax benefit on stock-based compensation | 978,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 410,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 369,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from employee stock purchase plan | 621,000 us-gaap_ProceedsFromStockPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 543,000 us-gaap_ProceedsFromStockPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 447,000 us-gaap_ProceedsFromStockPlans / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by financing activities | 232,691,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,360,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 44,891,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Increase in Cash | 25,716,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 315,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,020,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and Cash Equivalents | $ 8,739,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 8,693,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |

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- Definition The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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