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Shareholders' Equity and Other Comprehensive Income (Changes in Shares by Class) (Details)
 12 Months Ended
Jan. 01, 2019
shares
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Dec. 31, 2018
USD ($)
shares
Jun. 17, 2019
USD ($)
Jun. 16, 2019
USD ($)
Jan. 15, 2019
USD ($)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, Common stock, shares outstanding (in shares)   147,157,596          
Warrants exercised and common stock reissued (in shares)     263,000        
Stock options exercised (in shares)   572,000 820,000 126,000      
Repurchase of common stock (in shares)   450,000 19,903,000        
Balance, Common stock, shares outstanding (in shares)   148,039,495 147,157,596        
Stock repurchase program, authorized amount | $       $ 150,000,000.0 $ 725,000,000.0 $ 325,000,000.0 $ 400,000,000.0
FCB Financial Holdings, Inc.              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock (in shares) 49,500,000            
FCB Financial Holdings, Inc. | FCB Financial Holdings, Inc.              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Merger exchange ratio 1.055            
Preferred Shares Issued              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance (in shares) 8,000,000 22,000,000 8,000,000 5,200,000      
Issuance of preferred stock (in shares)     14,000,000 8,000,000      
Repurchase of stock (in shares)       5,200,000      
Balance (in shares)   22,000,000 22,000,000 8,000,000      
Preferred Shares Issued | Series C Preferred Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance (in shares) 0 0 0 5,200,000      
Repurchase of stock (in shares)       5,200,000      
Balance (in shares)   0 0 0      
Preferred Shares Issued | Series D Preferred Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance (in shares) 8,000,000 8,000,000 8,000,000 0      
Issuance of preferred stock (in shares)     0 8,000,000      
Balance (in shares)   8,000,000 8,000,000 8,000,000      
Preferred Shares Issued | Series E Preferred Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance (in shares) 0 14,000,000 0 0      
Issuance of preferred stock (in shares)     14,000,000        
Balance (in shares)   14,000,000 14,000,000 0      
Common Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance (in shares) 143,300,000 166,801,000 143,300,000 142,678,000      
Balance, Common stock, shares outstanding (in shares) 115,866,000 147,158,000 115,866,000 118,897,000      
Issuance of common stock (in shares)   379,000 344,000 199,000      
Warrants exercised and common stock reissued (in shares)     260,000        
Restricted share unit activity (in shares)   389,000 302,000 297,000      
Stock options exercised (in shares)   564,000 812,000 126,000      
Repurchase of common stock (in shares)   450,000 19,900,000 3,700,000      
Repurchase of stock (in shares)   (450,000) (19,903,000) (3,653,000)      
Balance (in shares)   168,133,000 166,801,000 143,300,000      
Balance, Common stock, shares outstanding (in shares)   148,040,000 147,158,000 115,866,000      
Common Stock | FCB Financial Holdings, Inc.              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock (in shares)     22,043,000        
Common stock reissued (in shares)     (27,434,000)        
Treasury Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance (in shares) 27,434,000 19,643,000 27,434,000 23,781,000      
Warrants exercised and common stock reissued (in shares)     (260,000)        
Repurchase of common stock (in shares)       3,653,000      
Balance (in shares)   20,093,000 19,643,000 27,434,000      
Treasury Stock | FCB Financial Holdings, Inc.              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock reissued (in shares)     (27,434,000)