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Leases (Schedule of Net Investment and Lease Income of Direct Financing and Sales-Type Leases) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Direct Financing and Sales-Type Leases:
Lease receivables	$ 132,431	$ 132,431
Unguaranteed residual assets	14,767	14,767
Net investment in direct financing and sales-type leases	147,198	147,198
Direct financing and sales-type lease income	$ 1,500	$ 4,500

X

- Definition

Sales-type And Direct Financing Lease, Lease Income

+ References

No definition available.

+ Details

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Namespace Prefix:	ewbc_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Sales-type And Direct Financing Lease, Unguaranteed Residual Asset

+ References

No definition available.

+ Details

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Namespace Prefix:	ewbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- References

No definition available.

+ Details

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

X

- 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

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X

- Definition

Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type and direct financing leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919391-209981

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919379-209981

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