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Stock-Based Compensation - Plan Description (Details)
9 Months Ended
Sep. 30, 2012
Nov. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant (in shares) 2,630,050  
Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Purchase price of common stock, percent (in hundredths) 100.00%  
Restricted stock, performance shares and performance units | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock, restriction period 1 year  
Time based vesting of grants | Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock, restriction period 3 years  
BBCN 2007 Plan | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Purchase price of common stock, percent (in hundredths) 100.00%  
BBCN 2007 Plan | Stock options and stock appreciation rights
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Contractual term 10 years  
BBCN 2007 Plan | Stock options and stock appreciation rights | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period minimum 3 years  
BBCN 2007 Plan | Stock options and stock appreciation rights | Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period minimum 5 years  
Center Financial Corporation
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Conversion factor of outstanding share awards and shares available for future grants   0.7805
Center Financial Corporation | 2006 Plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding options (in shares)   585,860
Number of shares available for grant (in shares)   2,443,513
Conversion factor of outstanding share awards and shares available for future grants   0.7805
Annual vesting percent 20.00%  
Center Financial Corporation | 2006 Plan | Nonemployee director
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Annual vesting percent 33.33333%  
Option expiration duration 10 years