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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 | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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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 | $ 43,321 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | $ 45,310 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | $ 57,246 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Collectively evaluated for impairment | 4,410,614 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 4,267,089 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 3,006,729 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Ending balance | 4,444,893 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | 4,312,399 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | 3,063,975 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 | 16,981 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 17,612 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 27,327 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Collectively evaluated for impairment | 919,493 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 898,614 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 677,059 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Ending balance | 933,715 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 916,226 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 704,386 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 | 4,601 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember | 5,109 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember | 2,508 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember
Collectively evaluated for impairment | 1,737,174 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember | 1,698,063 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember | 1,193,897 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember
Ending balance | 1,739,483 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember | 1,703,172 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateInvestmentMember | 1,196,405 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 | 6,840 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember | 6,891 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember | 7,323 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Collectively evaluated for impairment | 490,154 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember | 454,690 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember | 313,671 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Ending balance | 493,003 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember | 461,581 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember | 320,994 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 | 147,871 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember | 148,018 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember | 97,733 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Ending balance | 147,871 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember | 148,018 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember | 97,846 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 | 889 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 1,398 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 756 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Collectively evaluated for impairment | 119,654 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 121,138 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 108,083 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Ending balance | 120,543 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 122,536 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 108,839 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 | 10 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember | 59 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember | 60 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember
Collectively evaluated for impairment | 98,697 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember | 109,343 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember | 5,998 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember
Ending balance | 98,707 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember | 109,402 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancialInstrumentAxis = egbn_ConsumerOtherMember | 6,058 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 | 14,000 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | 14,241 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | 19,159 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember
Collectively evaluated for impairment | 897,571 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | 837,223 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | 610,288 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember
Ending balance | $ 911,571 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | $ 851,464 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | $ 629,447 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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