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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
Stockholders' equity at beginning of period at Dec. 31, 2016 $ 2,291,595 $ 0 $ 88,001 $ 770,344 $ 339,966 $ 1,093,284
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 174,645         174,645
Other comprehensive income (loss) 384,633       384,633  
Share-based compensation 6,464     6,464    
Issuance of common stock under compensation plans 15,968   1,330 14,638    
Dividends on common stock (23,148)         (23,148)
Stockholders' equity at end 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)
Share-based compensation 11,097     11,097    
Issuance of common stock under compensation plans 9,681   1,038 8,643    
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 preferred stock 388,893 16   388,877    
Share-based compensation 11,295     11,295    
Issuance of common stock under compensation plans 1,691   738 953    
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