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Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Jul. 29, 2016
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 463,975,000 $ 462,997,000    
Goodwill impairment 0   $ 0  
Gross Carrying Amount 25,605,000      
Accumulated Amortization (7,055,000)      
Core Deposits        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense related to core deposit intangible qssets $ 676,000   $ 212,000  
Center Financial Corporation | Core Deposits        
Finite-Lived Intangible Assets [Line Items]        
Amortization period 7 years      
Gross Carrying Amount $ 4,100,000      
Accumulated Amortization $ (3,755,000)      
Pacific International Bancorp, Inc. | Core Deposits        
Finite-Lived Intangible Assets [Line Items]        
Amortization period 7 years      
Gross Carrying Amount $ 604,000      
Accumulated Amortization $ (484,000)      
Foster Bankshares Inc | Core Deposits        
Finite-Lived Intangible Assets [Line Items]        
Amortization period 10 years      
Gross Carrying Amount $ 2,763,000      
Accumulated Amortization (1,417,000)      
Wilshire Bancorp, Inc        
Finite-Lived Intangible Assets [Line Items]        
Goodwill 358,600,000     $ 358,574,000
Goodwill, acquired during period 359,000,000      
Goodwill, Purchase Accounting Adjustments   (1,400,000)    
Goodwill, Period Increase (Decrease) $ 978,000 $ (1,400,000)    
Wilshire Bancorp, Inc | Core Deposits        
Finite-Lived Intangible Assets [Line Items]        
Amortization period 10 years      
Gross Carrying Amount $ 18,138,000      
Accumulated Amortization $ (1,399,000)