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Fair Value Measurements - Summary of difference between aggregate fair value and aggregate unpaid principal balance (Details) - Residential mortgage backed securities - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 142,196	$ 88,205
Aggregate Unpaid Principal Balance	139,606	86,551
Difference	2,590	1,654
Loans 90 or more days past due	0	0
Loans in nonaccrual status	$ 0	$ 0

X

- Definition

It represents the amount of aggregate unpaid principal balance.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

It represents the amount of difference between fair value and aggregate unpaid principal balance.

+ References

No definition available.

+ Details

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Namespace Prefix:	egbn_
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

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X

- Definition

This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(2)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

+ Details

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