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Leases (Narrative) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items] |
Option to extend, operating lease (up to) | 15 years
Net investment in direct financing and sales-type lease | $ 147,198
Carrying amount of guaranteed residual value | $ 31,400
Minimum |
Lessee, Lease, Description [Line Items] |
Operating lease expiration date | 2019
Finance lease expiration date | 2021
Direct financing and sales-type lease expiration date | 2020
Maximum |
Lessee, Lease, Description [Line Items] |
Operating lease expiration date | 2030
Finance lease expiration date | 2047
Direct financing and sales-type lease expiration date | 2027

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- Definition Lessee, Finance Lease, Contract Expiration Date, Term + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Operating Lease, Contract Expiration Date, Term + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessor, Sales-type and Direct Financing Lease, Contract Expiration Date, Term + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of net investment in sales-type and direct financing lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77888421&loc=SL77919306-209978 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of residual asset covered by residual value guarantee. Excludes guarantee considered to be lease payments for lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919381-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |