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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Retained Earnings
Stockholders' equity at beginning of period at Dec. 31, 2019 $ 4,426,522 $ 16 $ 91,107 $ 1,212,311 $ 1,354,324 $ 1,768,764
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 242,947         242,947
Other comprehensive loss (1,157,515)       (1,157,515)  
Share-based compensation 2,289     2,289    
Issuance of common stock 1,255   391 864    
Cumulative effect of change in accounting principle (9,295)         (9,295)
Dividends on preferred stock (6,611)         (6,611)
Stockholders' equity at end of period at Mar. 31, 2020 3,499,592 16 91,498 1,215,464 196,809 1,995,805
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 282,684         282,684
Other comprehensive loss (698,297)       (698,297)  
Share-based compensation 4,296     4,296    
Issuance of common stock 5,006   402 4,604    
Treasury stock acquired, common (2,998)   (640) (2,358)    
Dividends on preferred stock (10,919)         (10,919)
Stockholders' equity at end of period at Mar. 31, 2021 $ 5,928,760 $ 28 $ 95,483 $ 1,687,669 $ 1,505,260 $ 2,640,320