NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 10) (Non-covered loans, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Performing loan
Restructured loans disclosures
Allowance for troubled debt restructurings loans receivable	$ 16,000	$ 13,000
Nonperforming loan
Restructured loans disclosures
Allowance for troubled debt restructurings loans receivable	$ 2,400	$ 836

The reserve to cover probable credit losses related to financing receivables that have been modified by troubled debt restructurings.

No definition available.

Name:	ewbc_AllowanceForTroubledDebtRestructuringsLoansReceivable
Namespace Prefix:	ewbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant