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Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |
Individually evaluated for impairment | $ 45,310 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | $ 34,597 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Collectively evaluated for impairment | 4,267,089 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 2,910,561 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Ending balance | 4,312,399 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | 2,945,158 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Commercial Loan [Member] |  |
Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |
Individually evaluated for impairment | 17,612 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 9,614 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Collectively evaluated for impairment | 898,614 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 684,736 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Ending balance | 916,226 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 694,350 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Commercial Real Estate Investment [Member] |  |
Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |
Individually evaluated for impairment | 5,109 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember | 2,682 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember
Collectively evaluated for impairment | 1,698,063 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember | 1,117,118 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember
Ending balance | 1,703,172 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember | 1,119,800 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember
Commercial Real Estate Owner Occupied [Member] |  |
Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |
Individually evaluated for impairment | 6,891 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember | 7,574 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Collectively evaluated for impairment | 454,690 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember | 309,917 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Ending balance | 461,581 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember | 317,491 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Residential Mortgage [Member] |  |
Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |
Individually evaluated for impairment |  | 113 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Collectively evaluated for impairment | 148,018 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember | 90,305 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Ending balance | 148,018 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember | 90,418 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Home Equity Line of Credit [Member] |  |
Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |
Individually evaluated for impairment | 1,398 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 682 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Collectively evaluated for impairment | 121,138 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 109,560 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Ending balance | 122,536 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 110,242 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Consumer, Other [Member] |  |
Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |
Individually evaluated for impairment | 59 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember | 70 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember
Collectively evaluated for impairment | 109,343 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember | 3,961 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember
Ending balance | 109,402 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember | 4,031 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember
Construction Loans [Member] |  |
Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |
Individually evaluated for impairment | 14,241 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | 13,862 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember
Collectively evaluated for impairment | 837,223 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | 594,964 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember
Ending balance | $ 851,464 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | $ 608,826 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember

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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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