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Note 5 - Loans and Allowance for Credit Losses (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2014
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Loans and Leases Receivable, Deferred Income (in Dollars) | $ 15,800,000 us-gaap_LoansAndLeasesReceivableDeferredIncome | $ 13,600,000 us-gaap_LoansAndLeasesReceivableDeferredIncome |  | $ 15,600,000 us-gaap_LoansAndLeasesReceivableDeferredIncome
Servicing Asset at Fair Value, Amount (in Dollars) | 67,700,000 us-gaap_ServicingAssetAtFairValueAmount |  |  | 67,900,000 us-gaap_ServicingAssetAtFairValueAmount
Minimum Debt Service Coverage | 1.15 egbn_MinimumDebtServiceCoverage |  |  |
Stress Test Assumption, Increase in Interest Rates | 2.00%egbn_StressTestAssumptionIncreaseInterestRates |  |  |
Financing Receivable, Net (in Dollars) | 4,444,893,000 us-gaap_NotesReceivableNet |  |  | 4,312,399,000 us-gaap_NotesReceivableNet
Loan Percent | 100.00%egbn_LoanPercent | 100.00%egbn_LoanPercent |  | 100.00%egbn_LoanPercent
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 |  |
Financing Receivable, Modifications, Number of Contracts | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 |  |
Performing Under Restructured Terms [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Financing Receivable, Modifications, Recorded Investment (in Dollars) | 13,400,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = egbn_PerformingUnderRestructuredTermsMember | 7,900,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = egbn_PerformingUnderRestructuredTermsMember |  | 13,500,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = egbn_PerformingUnderRestructuredTermsMember
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Percent of Loan Portfolio | 12.00%egbn_PercentOfLoanPortfolio / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember |  |  |
Financing Receivable, Net (in Dollars) | 493,003,000 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember |  |  | 461,581,000 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate and Real Estate Construction Loans [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Percent of Loan Portfolio | 71.00%egbn_PercentOfLoanPortfolio / us-gaap_FinancialInstrumentAxis = egbn_CommercialRealEstateandRealEstateConstructionLoansMember |  |  |
Excluding Owner Occupied Commercial Real Estate and Commercial Construction Loans [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Percent of Loan Portfolio | 59.00%egbn_PercentOfLoanPortfolio / us-gaap_FinancialInstrumentAxis = egbn_ExcludingOwnerOccupiedCommercialRealEstateAndCommercialConstructionLoansMember |  |  |
Commercial Loan [Member] | Preferred Term [Member] | Maximum [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Loan Period | 7 years |  |  |
Commercial Loan [Member] | Preferred Term [Member] | Minimum [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Loan Period | 5 years |  |  |
Commercial Loan [Member] | Maximum [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Loan Period | 10 years |  |  |
Amortization Term | 25 years |  |  |
Commercial Loan [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Percent of Loan Portfolio | 21.00%egbn_PercentOfLoanPortfolio / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember |  |  |
Financing Receivable, Net (in Dollars) | 933,715,000 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember |  |  | 916,226,000 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
SBA Loans [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Percent of Loan Portfolio | 1.00%egbn_PercentOfLoanPortfolio / us-gaap_FinancialInstrumentAxis = egbn_SBALoansMember |  |  |
Home Equity Line of Credit [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Percent of Loan Portfolio | 5.00%egbn_PercentOfLoanPortfolio / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember |  |  |
Financing Receivable, Net (in Dollars) | 120,543,000 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember |  |  | 122,536,000 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Residential Mortgage Loan [Member] | Maximum [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Loan Period | 10 years |  |  |
Residential Mortgage Loan [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Percent of Loan Portfolio | 3.00%egbn_PercentOfLoanPortfolio / us-gaap_FinancialInstrumentAxis = egbn_ResidentialMortgageLoanMember |  |  |
Commercial Land Acquisition Loans [Member] | Maximum [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Loan Period | 24 months |  |  |
ADC Loans [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Financing Receivable, Net (in Dollars) | 912,000,000 us-gaap_NotesReceivableNet / us-gaap_FinancialInstrumentAxis = egbn_ADCLoansMember |  |  |
Loan Percent | 37.00%egbn_LoanPercent / us-gaap_FinancialInstrumentAxis = egbn_ADCLoansMember |  |  |
Nonaccrual Loans [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method (in Dollars) | 0 us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = egbn_NonaccrualLoansMember |  |  |
Nonaccrual Loans Current and in Accordance with Original Terms [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Impaired Financing Receivable, Interest Income, Accrual Method (in Dollars) | 310,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_StatementScenarioAxis = egbn_NonaccrualLoansCurrentAndInAccordanceWithOriginalTermsMember |  |  |
Construction Loans [Member] | Maximum [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Loan Period | 36 months |  |  |
Construction Loans [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Financing Receivable, Net (in Dollars) | 911,571,000 us-gaap_NotesReceivableNet / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember |  |  | 851,464,000 us-gaap_NotesReceivableNet / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember
Nonperforming Financing Receivable [Member] | Fidelity [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net (in Dollars) | 3,400,000 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = egbn_FidelityMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  |  |
Nonperforming Financing Receivable [Member] | Virginia Heritage Bank [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net (in Dollars) | $ 4,600,000 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  |  |
Maximum [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Loan to Value Ratio | 80.00%egbn_LoanToValueRatio / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Loan Period |  |  | 90 days |
Minimum [Member] |  |  |  |
Note 5 - Loans and Allowance for Credit Losses (Details) [Line Items] |  |  |  |
Interest Rate Adjustment Frequency | 5 years |  |  |
Loan Period | 30 days |  |  |

X
- Definition Amortization period for loans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Frequency in which interest rate adjustments are made. + References No definition available. + Details
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Balance Type: | na
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- Definition Percent of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References No definition available. + Details
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Namespace Prefix: | egbn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period of time between origination and maturity of a loan, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition This item represents the collateral to loan balance ratio. + References No definition available. + Details
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Namespace Prefix: | egbn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the minimum debt service coverage required. + References No definition available. + Details
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- Definition This item represents the percentage of the total loan portfolio represented by a segment of loans. + References No definition available. + Details
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Namespace Prefix: | egbn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This item represents the estimated increase in interest rates for performing the Company's stress tests. + References No definition available. + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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X
- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for 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 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6378556&loc=d3e10152-111534 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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