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Stock-Based Compensation - Plan Description (Details) - shares
3 Months Ended
Jul. 29, 2016
Mar. 31, 2017
Sep. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant (in shares)   1,890,563  
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   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   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   5 years  
2016 Stock Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     2,400,000
2016 Stock Incentive Plan | Nonemployee director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual term   10 years  
2016 Stock Incentive Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Purchase price of common stock, percent   100.00%  
Wilshire Bancorp, Inc      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Entity shares Issued per acquiree share 0.7034