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SUMMARY OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 3)
12 Months Ended
Dec. 31, 2014
Long-Term Debt  
Number of statutory business trusts 6ewbc_NumberOfWhollyOwnedStatutoryBusinessTrusts
Building and Building Improvements  
Premises and equipment  
Estimated useful life 25 years
Furniture, fixtures and equipment | Minimum  
Premises and equipment  
Estimated useful life 3 years
Furniture, fixtures and equipment | Maximum  
Premises and equipment  
Estimated useful life 7 years