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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Preferred Stock
Common Stock
Preferred Stock
Preferred Stock
Preferred Stock
Common Stock
Common Stock
Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Preferred Stock
Additional Paid-In Capital
Common Stock
Accumulated Other Comprehensive Income
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Stockholders' equity at beginning of period at Dec. 31, 2019 $ 4,426,522 $ (9,295)     $ 16   $ 91,107   $ 1,212,311     $ 1,354,324 $ 1,768,764 $ (9,295)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Net income 662,718                       662,718  
Other comprehensive income (loss) 557,268                     557,268    
Share-based compensation 7,515               7,515          
Issuance of stock     $ 290,260 $ 1,738   $ 12   $ 825   $ 290,248 $ 913      
Dividends on preferred stock (18,511)                       (18,511)  
Stockholders' equity at end of period at Sep. 30, 2020 5,918,215       28   91,932   1,510,987     1,911,592 2,403,676  
Stockholders' equity at beginning of period at Jun. 30, 2020 4,919,689       28   91,595   1,508,171     1,577,469 1,742,426  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Net income 667,200                       667,200  
Other comprehensive income (loss) 334,123                     334,123    
Share-based compensation 3,121               3,121          
Issuance of stock       32       337     (305)      
Dividends on preferred stock (5,950)                       (5,950)  
Stockholders' equity at end of period at Sep. 30, 2020 5,918,215       28   91,932   1,510,987     1,911,592 2,403,676  
Stockholders' equity at beginning of period at Dec. 31, 2020 6,348,988       28   95,721   1,681,127     2,203,557 2,368,555  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Net income 380,855                       380,855  
Other comprehensive income (loss) (246,583)                     (246,583)    
Share-based compensation 19,265               19,265          
Issuance of stock       4,854       459     4,395      
Treasury stock acquired, common (99,415)           (3,667)   (95,748)          
Dividends on preferred stock (32,756)                       (32,756)  
Stockholders' equity at end of period at Sep. 30, 2021 6,375,208       28   92,513   1,609,039     1,956,974 2,716,654  
Stockholders' equity at beginning of period at Jun. 30, 2021 6,295,735       28   92,554   1,604,535     2,023,911 2,574,707  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Net income 152,865                       152,865  
Other comprehensive income (loss) (66,937)                     (66,937)    
Share-based compensation 6,109               6,109          
Issuance of stock       $ (306)       $ 0     $ (306)      
Treasury stock acquired, common (1,340)           (41)   (1,299)          
Dividends on preferred stock (10,918)                       (10,918)  
Stockholders' equity at end of period at Sep. 30, 2021 $ 6,375,208       $ 28   $ 92,513   $ 1,609,039     $ 1,956,974 $ 2,716,654