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Mergers and Acquisitions - Additional Information (Details)
 3 Months Ended
Jul. 29, 2016
USD ($)
branch
shares
Mar. 31, 2017
USD ($)
state
branch
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Business Acquisition [Line Items]        
Branches operated | branch   85    
States in which entity operates | state   9    
Loans receivable, Net   $ 10,471,008,000 $ 10,463,989,000  
Merger and integration expenses   947,000   $ 1,207,000
Wilshire Bancorp, Inc        
Business Acquisition [Line Items]        
Fair value of acquired impaired loans $ 243,100,000      
Branches operated | branch 35      
Assets acquired $ 4,630,000,000      
Goodwill, Purchase Accounting Adjustments     (1,400,000)  
Goodwill, Period Increase (Decrease)   978,000 (1,400,000)  
Loans acquired 3,800,807,000      
Deposits acquired $ 3,812,367,000      
Entity shares Issued per acquiree share | shares 0.7034      
Stock issued for acquisitions | shares 55,500,000      
Cash paid for fractional shares $ 3,000      
Consideration paid 856,312,000      
Loans receivable, gross 4,720,000,000   5,670,000,000  
Loans receivable, Net $ 3,420,000,000   $ 3,590,000,000  
Wilshire Bancorp, Inc | Other real estate owned [Member]        
Business Acquisition [Line Items]        
Goodwill, Purchase Accounting Adjustments   (1,700,000)    
Wilshire Bancorp, Inc | Deferred Tax Assets [Member]        
Business Acquisition [Line Items]        
Goodwill, Purchase Accounting Adjustments   $ (716,000)