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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 (Loss)
Retained Earnings
Preferred Stock
Preferred Stock
Preferred Stock
Preferred Stock
Additional Paid-In Capital
Common Stock
Common Stock
Common Stock
Common Stock
Additional Paid-In Capital
Stockholders' equity at beginning of period at Dec. 31, 2017 $ 2,850,157 $ 0 $ 89,331 $ 791,446 $ 724,599 $ 1,244,781            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 458,016         458,016            
Other comprehensive income (loss) (904,585)       (904,585)              
Implementation of accounting standard related to the reclassification of certain tax effects         127,554 (127,554)            
Issuance of stock                   $ 9,681 $ 1,038 $ 8,643
Share-based compensation 11,097     11,097                
Dividends on common stock (25,265)         (25,265)            
Stockholders' equity at end of period at Dec. 31, 2018 2,399,101 0 90,369 811,186 (52,432) 1,549,978            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 246,090         246,090            
Other comprehensive income (loss) 1,550,353       1,550,353              
Issuance of stock             $ 388,893 $ 16 $ 388,877 1,691 738 953
Share-based compensation 11,295     11,295                
Dividends on common stock (27,304)         (27,304)            
Stockholders' equity at end of period at Dec. 31, 2019 4,570,119 16 91,107 1,212,311 1,497,921 1,768,764            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 671,460         671,460            
Other comprehensive income (loss) 931,364       931,364              
Issuance of stock             $ 290,260 $ 12 $ 290,248 $ 338,061 $ 10,053 $ 328,008
Share-based compensation 10,215     10,215                
Treasury stock acquired, common (165,094)   (5,439) (159,655)                
Cumulative effect of change in accounting principle (9,295)         (9,295)            
Dividends on preferred stock (33,515)         (33,515)            
Dividends on common stock (28,859)         (28,859)            
Stockholders' equity at end of period at Dec. 31, 2020 $ 6,574,716 $ 28 $ 95,721 $ 1,681,127 $ 2,429,285 $ 2,368,555