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Note 7 - Intangible Assets (Details) - Intangible Assets (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items] |  |  |  |
Core deposit, additions | $ 107,142 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent |  | $ 339 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent |
Core deposit, accumulated amoritization | (2,782)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (2,038)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Core deposit, net intangible assets | 109,908 us-gaap_FiniteLivedIntangibleAssetsNet |  | 3,510 us-gaap_FiniteLivedIntangibleAssetsNet |
Excess servicing, additions | 107,142 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent |  | 339 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent |
Excess servicing, accumulated amoritization | (2,782)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (2,038)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Excess servicing, net intangible assets | 109,908 us-gaap_FiniteLivedIntangibleAssetsNet |  | 3,510 us-gaap_FiniteLivedIntangibleAssetsNet |
Gross intangible assets | 5,548 us-gaap_IntangibleAssetsCurrent |  | 5,209 us-gaap_IntangibleAssetsCurrent |
Additions | 107,142 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent |  | 339 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent |
Accumulated amoritization | (2,782)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (2,038)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net intangible assets | 109,908 us-gaap_FiniteLivedIntangibleAssetsNet |  | 3,510 us-gaap_FiniteLivedIntangibleAssetsNet |
Core Deposits [Member] |  |  |  |
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items] |  |  |  |
Core deposit, gross intangible assets | 2,520 us-gaap_FiniteLivedCoreDepositsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] | 2,520 us-gaap_FiniteLivedCoreDepositsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1]
Core deposit, additions | 4,550 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] |  | [1]
Core deposit, accumulated amoritization | (1,869)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] | (1,407)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1]
Core deposit, net intangible assets | 5,201 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] | 1,113 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1]
Excess servicing, additions | 4,550 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] |  | [1]
Excess servicing, accumulated amoritization | (1,869)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] | (1,407)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1]
Excess servicing, net intangible assets | 5,201 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] | 1,113 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1]
Additions | 4,550 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] |  | [1]
Accumulated amoritization | (1,869)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] | (1,407)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1]
Net intangible assets | 5,201 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1] | 1,113 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | [1]
Excess Servicing [Member] |  |  |  |
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items] |  |  |  |
Core deposit, additions | 330 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | 339 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Core deposit, accumulated amoritization | (913)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | (631)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Core deposit, net intangible assets | 282 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | 234 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Excess servicing, gross intangible assets | 865 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | 526 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Excess servicing, additions | 330 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | 339 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Excess servicing, accumulated amoritization | (913)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | (631)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Excess servicing, net intangible assets | 282 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | 234 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Additions | 330 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | 339 us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Accumulated amoritization | (913)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | (631)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Net intangible assets | 282 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2] | 234 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = egbn_ExcessServicingMember | [2]
Goodwill [Member] |  |  |  |
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items] |  |  |  |
Gross intangible assets, goodwill | 2,163 us-gaap_GoodwillGross / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | [3] | 2,163 us-gaap_GoodwillGross / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | [3]
Additions, goodwill | 102,262 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | [3] |  | [3]
Accumulated amoritization, goodwill |  | [3] |  | [3]
Net intangible assets, goodwill | $ 104,425 us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | [3] | $ 2,163 us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | [3]
[1] | In connection with the Fidelity acquisition (August 2008), one branch purchase (January 2011), and the Virginia Heritage acquisition, the Company made anallocation of the purchase price to the core deposit intangibles which were $2.3 million, $215 thousand, and $4.6 million respectively based on an independentevaluation. The amount of the core deposit intangible relating to the one branch acquisition was fully amortized at December 31, 2013. The amount of the coredeposit intangible relating to the Fidelity acquisition at December 31, 2014 was $804 thousand, which is being amortized over its remaining economic life of 1.2years as a component of other noninterest expense. The amount of the core deposit intangible relating to the Virginia Heritage acquisition at December 31,2014 was $4.4 million, which is being amortized over its remaining economic life of 6 years as a component of other noninterest expense.
[2] | The Company recognizes a servicing asset for the computed value of servicing fees on the sale of the guaranteed portion of SBA loans, which is in excess ofa normal servicing fee. Assumptions related to the loan term and amortization period are made to arrive at the initial recorded value.
[3] | The Company recorded an initial amount of unidentified intangible (goodwill) incident to the acquisition of Fidelity & Trust Financial Corporation ("Fidelity")of approximately $360 thousand. Based on allowable adjustments through August 31, 2009, the unidentified intangible (goodwill) amounted to approximately $2.2 million. The Company recorded an initial amount of unidentified intangible (goodwill) incident to the acquisition of Virginia Heritage of approximately $102.3 million.

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- Definition Bank deposits belonging to an acquired bank that can be counted on as a stable source of lending funds. These deposits have the following attributes: predictable costs and low sensitivity to interest rates. This intangible asset is usually amortized over its estimated useful life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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