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Note 2 - Business Combinations (Details) (Virginia Heritage Bank [Member], USD $) In Millions, except Share data, unless otherwise specified | Jun. 09, 2014
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Note 2 - Business Combinations (Details) [Line Items] |
Preferred Stock, Shares Outstanding (in Shares) | 15,300
Preferred Stock, Liquidation Preference, Value (in Dollars) | $ 15.3
Common Stock [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Business Acquisition, Share Price | $ 20.50
Average Share Price 29 to 35.5 [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Business Combination,Cash per Acquiree's Common Stock | $ 7.50
Business Combination,Shares per Acquiree's Common Stock,Numerator | $ 21.50
Average Share Price 29 to 35.5 [Member] | Minimum [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Average Share Price | $ 29.00
Average Share Price 29 to 35.5 [Member] | Maximum [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Average Share Price | $ 35.50
Average Price Less Than 29 [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Business Combination,Cash per Acquiree's Common Stock | $ 7.50
Average Price Less Than 29 [Member] | Maximum [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Average Share Price | $ 29.00
Average Share Price Greater Than 35.5 [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Business Combination,Cash per Acquiree's Common Stock,Multiplier One | $ 0.8169
BusinessCombinationCashPerAcquireesCommonStockMultiplierTwo | $ 0.258621
BusinessCombinationSharesPerAcquireesCommonStock | $ 0.6056
Average Share Price Greater Than 35.5 [Member] | Minimum [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Average Share Price | $ 35.50
Average Share Price Less Than 13.64 [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Average Share Price | $ 7.50
Average Share Price Less Than 13.64 [Member] | Maximum [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Average Share Price | $ 13.64
Acquisition Termination Fee [Member] |
Note 2 - Business Combinations (Details) [Line Items] |
Business Combination, Contingent Consideration, Asset (in Dollars) | $ 7.25

X
- Definition Represents the average closing price of the company common stock for the 20 trading days ending five trading days prior to closing of business acquisition + References No definition available. + Details
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Namespace Prefix: | egbn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cash each share of acquiree's common stock would be converted into. + References No definition available. + Details
Name: | egbn_BusinessCombinationCashPerAcquireesCommonStock
Namespace Prefix: | egbn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents one multiplier to calculate the cash each share of acquiree's common stock would be converted into + References No definition available. + Details
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Namespace Prefix: | egbn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the second multiplier to calculate the cash each share of acquiree's common stock would be converted into + References No definition available. + Details
Name: | egbn_BusinessCombinationCashPerAcquireesCommonStockMultiplierTwo
Namespace Prefix: | egbn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares of the company's common stock each share of acquiree's common stock would be converted into. + References No definition available. + Details
Name: | egbn_BusinessCombinationSharesPerAcquireesCommonStock
Namespace Prefix: | egbn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the numerator to calculate the number of shares of the company's common stock each share of acquiree's common stock would be converted into. + References No definition available. + Details
Name: | egbn_BusinessCombinationSharesPerAcquireesCommonStockNumerator
Namespace Prefix: | egbn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of asset recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476 + Details
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Balance Type: | debit
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X
- Definition Value of the difference between preference in liquidation and the par or stated values of the preferred shares. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + 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 210.5-02.28) -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 29 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant