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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
12 Months Ended
Jul. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Granted (in shares)   0 1,281,552 0
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding - beginning of period (in shares)   1,603,876    
Exercised (in shares)   (215,270)    
Expired (in shares)   (250,762)    
Forfeited (in shares)   (62,421)    
Outstanding - end of period (in shares)   1,075,423 1,603,876  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Outstanding - beginning of period, weighted-average exercise price per share (usd per share)   $ 15.28    
Granted - weighted average exercise price (usd per share)   0.00    
Exercised - weighted average exercise price (usd per share)   8.46    
Expired - weighted-average exercise price per share (usd per share)   21.61    
Forfeited - weighted average exercise price (usd per share)   17.17    
Outstanding - end of period, weighted-average exercise price per share (usd per share)   $ 15.06 $ 15.28  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]        
Options exercisable - end of period (in shares)   644,086    
Options exercisable, weighted-average exercise price per share (usd per share)   $ 13.81    
Outstanding, weighted-average remaining contractual life (years)   7 years 3 months 5 days    
Options exercisable, weighted-average remaining contractual life (years)   6 years 6 months 13 days    
Outstanding, aggregate intrinsic value   $ 3,433,460    
Options exercisable, aggregate intrinsic value   $ 2,857,618    
Wilshire Bancorp, Inc        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share 0.7034