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Consolidated Statements of Changes in Shareholders' Equity (unaudited) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Cumulative Effect, Period of Adoption, Adjusted Balance
Common Stock
Common Stock
Cumulative Effect, Period of Adoption, Adjusted Balance
Capital Surplus
Capital Surplus
Cumulative Effect, Period of Adoption, Adjusted Balance
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjusted Balance
Balance at beginning of period at Dec. 31, 2019 $ 2,852,453 $ (31,150) $ 2,821,303 $ 169,616 $ 169,616 $ 1,944,445 $ 1,944,445 $ 682,185 $ (31,150) $ 651,035 $ 56,207 $ 56,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 22,640             22,640        
Other comprehensive income (loss) 81,950                   81,950  
Dividends - common stock (23,535)             (23,535)        
Common stock issued 151     9   142            
Common stock repurchased (81,822)     (5,076)   (76,746)            
Share-based compensation expense 2,748         2,748            
Stock activity under incentive compensation plans 0     560   (329)   (231)        
Balance at end of period at Mar. 31, 2020 2,823,435     165,109   1,870,260   649,909     138,157  
Balance at beginning of period at Dec. 31, 2019 2,852,453 $ (31,150) $ 2,821,303 169,616 $ 169,616 1,944,445 $ 1,944,445 682,185 $ (31,150) $ 651,035 56,207 $ 56,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 152,289                      
Other comprehensive income (loss) 93,077                      
Balance at end of period at Sep. 30, 2020 2,921,149     165,333   1,873,483   733,049     149,284  
Balance at beginning of period at Mar. 31, 2020 2,823,435     165,109   1,870,260   649,909     138,157  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 51,705             51,705        
Other comprehensive income (loss) 10,886                   10,886  
Dividends - common stock (23,113)             (23,113)        
Common stock issued 145     11   134            
Common stock repurchased (473)     (34)   (439)            
Share-based compensation expense 1,480         1,480            
Stock activity under incentive compensation plans 190     7   306   (123)        
Balance at end of period at Jun. 30, 2020 2,864,255     165,093   1,871,741   678,378     149,043  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 77,944             77,944        
Other comprehensive income (loss) 241                   241  
Dividends - common stock (23,147)             (23,147)        
Common stock issued 136     11   125            
Common stock repurchased (14)     (2)   (12)            
Share-based compensation expense 1,734         1,734            
Stock activity under incentive compensation plans 0     231   (105)   (126)        
Balance at end of period at Sep. 30, 2020 2,921,149     165,333   1,873,483   733,049     149,284  
Balance at beginning of period at Dec. 31, 2020 2,972,656     165,367   1,875,626   783,892     147,771  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 86,818             86,818        
Other comprehensive income (loss) (55,862)                   (55,862)  
Dividends - common stock (23,195)             (23,195)        
Common stock issued 139     9   130            
Common stock repurchased (2,856)     (160)   (2,696)            
Share-based compensation expense 1,747         1,747            
Stock activity under incentive compensation plans 0     460   (235)   (225)        
Balance at end of period at Mar. 31, 2021 2,979,447     165,676   1,874,572   847,290     91,909  
Balance at beginning of period at Dec. 31, 2020 2,972,656     165,367   1,875,626   783,892     147,771  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 221,350                      
Other comprehensive income (loss) (90,961)                      
Balance at end of period at Sep. 30, 2021 3,035,892     165,814   1,878,106   935,162     56,810  
Balance at beginning of period at Mar. 31, 2021 2,979,447     165,676   1,874,572   847,290     91,909  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 62,786             62,786        
Other comprehensive income (loss) (29,647)                   (29,647)  
Dividends - common stock (23,202)             (23,202)        
Common stock issued 143     7   136            
Common stock repurchased (449)     (24)   (425)            
Share-based compensation expense 1,816         1,816            
Stock activity under incentive compensation plans 224     73   273   (122)        
Balance at end of period at Jun. 30, 2021 2,991,118     165,732   1,876,372   886,752     62,262  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 71,746             71,746        
Other comprehensive income (loss) (5,452)                   (5,452)  
Dividends - common stock (23,214)             (23,214)        
Common stock issued 147     9   138            
Common stock repurchased (408)     (23)   (385)            
Share-based compensation expense 1,955         1,955            
Stock activity under incentive compensation plans 0     96   26   (122)        
Balance at end of period at Sep. 30, 2021 $ 3,035,892     $ 165,814   $ 1,878,106   $ 935,162     $ 56,810