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Shareholders' Equity and Other Comprehensive Income (Narrative) (Details)
 12 Months Ended
Jul. 01, 2019
USD ($)
$ / shares
Jan. 01, 2019
USD ($)
shares
Aug. 01, 2018
USD ($)
$ / shares
shares
Jun. 21, 2018
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Oct. 31, 2020
USD ($)
shares
Nov. 30, 2019
USD ($)
shares
Jun. 17, 2019
USD ($)
Jun. 16, 2019
USD ($)
Jan. 15, 2019
USD ($)
Nov. 30, 2018
USD ($)
shares
Class of Stock [Line Items]                          
Proceeds from issuance of stock         $ 0 $ 342,005,000 $ 65,140,000            
Cash dividends paid [1]         33,163,000 22,881,000 13,978,000            
Repurchases of common stock         $ 16,246,000 $ 725,398,000 175,072,000            
Repurchase of common stock (in shares) | shares         450,000 19,903,000              
Stock repurchase program, authorized amount             150,000,000.0     $ 725,000,000.0 $ 325,000,000.0 $ 400,000,000.0  
Warrant outstanding (in shares) | shares   913,000                      
Warrants exercised and common stock reissued (in shares) | shares           263,000              
Common stock         $ 168,133,000 $ 166,801,000              
Common stock, shares issued (in shares) | shares         168,132,522 166,800,623              
Fourth Quarter of 2017                          
Class of Stock [Line Items]                          
Stock repurchase program, authorized amount             25,000,000.0            
Series E Preferred Stock                          
Class of Stock [Line Items]                          
Proceeds from issuance of stock $ 350,000,000.0                        
Payments of stock issuance costs $ 342,000,000.0                        
Redemption period from regulatory capital treatment 90 days                        
Redemption price per share (in dollars per share) | $ / shares $ 25                        
Series E Preferred Stock | Until July 1, 2024 (Excluding July 1, 2024)                          
Class of Stock [Line Items]                          
Dividend rate, percentage 587.50%                        
Series E Preferred Stock | From July 1, 2024 (Including July 1, 2024)                          
Class of Stock [Line Items]                          
Dividend rate, percentage 4.127%                        
Series D Preferred Stock                          
Class of Stock [Line Items]                          
Proceeds from issuance of stock       $ 200,000,000.0                  
Payments of stock issuance costs       $ 195,100,000                  
Redemption period from regulatory capital treatment       90 days                  
Redemption price per share (in dollars per share) | $ / shares       $ 25                  
Liquidation preference (in dollars per share) | $ / shares       $ 25                  
Series D Preferred Stock | From and Excluding June 21, 2023                          
Class of Stock [Line Items]                          
Dividend rate, percentage       6.30%                  
Series D Preferred Stock | From and Including June 21, 2023                          
Class of Stock [Line Items]                          
Dividend rate, percentage       3.352%                  
Series C Preferred Stock                          
Class of Stock [Line Items]                          
Redemption price per share (in dollars per share) | $ / shares     $ 25                    
Cash dividends paid     $ 2,600,000                    
Repurchases of common stock             130,000,000            
FCB Financial Holdings, Inc.                          
Class of Stock [Line Items]                          
Stock issued in acquisitions (in shares) | shares   49,500,000                      
Consideration transferred   $ 1,630,000,000                      
FCB Financial Holdings, Inc. | FCB Financial Holdings, Inc.                          
Class of Stock [Line Items]                          
Merger exchange ratio   1.055                      
Global One                          
Class of Stock [Line Items]                          
Common stock               $ 8,700,000 $ 11,800,000       $ 7,400,000
Common stock, shares issued (in shares) | shares               379,000 344,000       199,000
Preferred Stock | Series C Preferred Stock                          
Class of Stock [Line Items]                          
Stock redeemed or called during period (in shares) | shares     5,200,000                    
Stock redeemed or called during period     $ 130,000,000.0                    
Dividends declared on preferred stock during the year but paid after year-end     $ 4,000,000.0                    
Repurchases of common stock             $ 125,980,000            
Common Stock                          
Class of Stock [Line Items]                          
Stock issued in acquisitions (in shares) | shares         379,000 344,000 199,000            
Repurchases of common stock           $ 725,000,000.0 $ 175,000,000.0            
Repurchase of common stock (in shares) | shares         450,000 19,900,000 3,700,000            
Warrants exercised and common stock reissued (in shares) | shares           260,000              
Common Stock | FCB Financial Holdings, Inc.                          
Class of Stock [Line Items]                          
Stock issued in acquisitions (in shares) | shares           22,043,000              
Treasury Stock                          
Class of Stock [Line Items]                          
Repurchases of common stock         $ 16,246,000 $ 725,398,000 $ 175,072,000            
Repurchase of common stock (in shares) | shares             3,653,000            
Warrants exercised and common stock reissued (in shares) | shares           (260,000)              
[1] For the year ended December 31, 2020, dividends per share were $1.58 and $1.47 for Series D and Series E Preferred Stock, respectively. For the year ended December 31, 2019, dividends per share were $1.58 and $0.73 for Series D and Series E Preferred Stock, respectively. For the year ended December 31, 2018, dividends per share were $1.48 and $0.79 for Series C and D Preferred Stock. respectively. (2)    For additional information, see "Part II - Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies.