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Stock-Based Compensation - Plan Description (Details) - shares
12 Months Ended
Jul. 29, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant (in shares)   1,111,396      
Granted (in shares)   0 0 1,281,552  
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      
2016 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized (in shares)         2,400,000
2016 Stock Incentive Plan | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Purchase price of common stock, percent (in hundredths)   100.00%      
2016 Stock Incentive Plan | Stock options and stock appreciation rights          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Contractual term   10 years      
2016 Stock Incentive 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      
2016 Stock Incentive 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      
2007 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Period after adoption date that awards may be granted   10 years      
Wilshire Bancorp, Inc          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock received for each share of Wilshire common stock 0.7034        
Nonemployee Director | 2016 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period   10 years