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Note 2 - Mergers and Acquisitions (Details) - Acquired Loan Portfolio (Virginia Heritage Bank [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Oct. 31, 2014
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Virginia Heritage Bank [Member] |  |
Accounted for under ASC 310-30: |  |
Contractual principal balance at acquisition | $ 4,448 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |
Contractual cash flows not expected to be collected (nonaccretable discount) | 1,191 us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |
Expected cash flows at acquisition at acquisition | 3,257 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |
Interest component of expected cash flows (accretable discount) |  |
Fair value at acquisition | 3,257 us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |
Excluded under ASC 310-30 accounting: |  |
Unpaid principal balance | 812,681 egbn_BusinessCombinationAcquiredReceivablesUnpaidPrincipalBalance / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |
Fair value discount | 11,618 egbn_BusinessCombinationAcquiredReceivablesFairValueDiscount / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |
Fair value at acquisition | 801,063 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember |
Total fair value at acquisition | $ 804,320 egbn_LoansFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember | $ 800,000 egbn_LoansFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = egbn_VirginiaHeritageBankMember

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- Details
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- Definition Represents a discount to the fair value of loans acquired. + References No definition available. + Details
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Namespace Prefix: | egbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the contractual principal amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References No definition available. + Details
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Namespace Prefix: | egbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Definition Loans acquired in a business combination, at fair value of the receivables acquired, for both loans transferred in and otherwise accounted for. + References No definition available. + Details
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Namespace Prefix: | egbn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating 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 No definition available. + Details
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Balance Type: | debit
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- Definition The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating 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 No definition available. + Details
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- Definition Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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