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Note 12 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired loans |  |
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired loans | $ 257 | $ 271
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans | 9,982 | 8,930
Commercial Portfolio Segment [Member] |  |
Impaired loans | $ 10,239 | $ 9,201
Income Producing Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired loans |  |
Income Producing Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired loans |  |
Income Producing Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans | $ 19,037 | $ 5,085
Income Producing Portfolio Segment [Member] |  |
Impaired loans | $ 19,037 | $ 5,085
Owner Occupied Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired loans |  |
Owner Occupied Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired loans |  | $ 282
Owner Occupied Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans | $ 1,364 | 1,071
Owner Occupied Portfolio Segment [Member] |  |
Impaired loans | $ 1,364 | $ 1,353
Residential Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired loans |  |
Residential Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired loans |  |
Residential Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans | $ 257 | $ 329
Residential Portfolio Segment [Member] |  |
Impaired loans | $ 257 | $ 329
Construction Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired loans |  |
Construction Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired loans |  |
Construction Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans | $ 5,112 | $ 9,504
Construction Portfolio Segment [Member] |  |
Impaired loans | $ 5,112 | $ 9,504
Home Equity Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired loans |  |
Home Equity Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired loans |  |
Home Equity Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans | $ 34 | $ 123
Home Equity Portfolio Segment [Member] |  |
Impaired loans | $ 34 | $ 123
Other Consumer Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired loans |  |
Other Consumer Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired loans |  |
Other Consumer Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans |  | $ 19
Other Consumer Portfolio Segment [Member] |  |
Impaired loans |  | $ 19
Fair Value, Inputs, Level 1 [Member] |  |
Other real estate owned |  |
Total assets measured at fair value on a nonrecurring basis |  |
Fair Value, Inputs, Level 2 [Member] |  |
Other real estate owned |  | $ 5,394
Total assets measured at fair value on a nonrecurring basis | $ 257 | 5,947
Fair Value, Inputs, Level 3 [Member] |  |
Other real estate owned | 3,846 | 458
Total assets measured at fair value on a nonrecurring basis | 39,632 | 25,519
Other real estate owned | 3,846 | 5,852
Total assets measured at fair value on a nonrecurring basis | $ 39,889 | $ 31,466

X
- Definition Fair value amount 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: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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X
- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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