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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Surplus
Retained Earnings
Other Comprehensive Income (Loss)
Treasury Stock
Total
Balance at Dec. 31, 2021 $ 96,351 $ 152,144 $ 2,470,710 $ (31,980) $ (378,744) $ 2,308,481
Balance (in shares) at Dec. 31, 2021 96,351          
Increase (decrease) in shareholders' equity            
Net Income (Loss)     194,820     194,820
Dividends:            
Cash/Payable     (75,375)     (75,375)
Purchase of treasury stock         (51,939) (51,939)
Exercise of stock options $ 34 698       732
Exercise of stock options (in shares) 34          
Stock compensation expense recognized in earnings   347       347
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (422,792)   (422,792)
Balance at Sep. 30, 2022 $ 96,385 153,189 2,590,155 (454,772) (430,683) 1,954,274
Balance (in shares) at Sep. 30, 2022 96,385          
Balance at Jun. 30, 2022 $ 96,368 152,743 2,544,148 (276,735) (419,293) 2,097,231
Balance (in shares) at Jun. 30, 2022 96,368          
Increase (decrease) in shareholders' equity            
Net Income (Loss)     83,356     83,356
Dividends:            
Cash/Payable     (37,349)     (37,349)
Purchase of treasury stock         (11,390) (11,390)
Exercise of stock options $ 17 328       345
Exercise of stock options (in shares) 17          
Stock compensation expense recognized in earnings   118       118
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (178,037)   (178,037)
Balance at Sep. 30, 2022 $ 96,385 153,189 2,590,155 (454,772) (430,683) 1,954,274
Balance (in shares) at Sep. 30, 2022 96,385          
Balance at Dec. 31, 2022 $ 96,420 154,061 2,695,567 (470,497) (430,792) 2,044,759
Balance (in shares) at Dec. 31, 2022 96,420          
Increase (decrease) in shareholders' equity            
Net Income (Loss)     305,392     305,392
Dividends:            
Cash/Payable     (78,247)     (78,247)
Purchase of treasury stock         (4,487) (4,487)
Exercise of stock options $ 24 630       654
Exercise of stock options (in shares) 24          
Stock compensation expense recognized in earnings   255       255
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (74,715)   (74,715)
Balance at Sep. 30, 2023 $ 96,444 154,946 2,922,712 (545,212) (435,279) 2,193,611
Balance (in shares) at Sep. 30, 2023 96,444          
Balance at Jun. 30, 2023 $ 96,432 154,522 2,858,544 (482,312) (435,195) 2,191,991
Balance (in shares) at Jun. 30, 2023 96,432          
Increase (decrease) in shareholders' equity            
Net Income (Loss)     103,264     103,264
Dividends:            
Cash/Payable     (39,096)     (39,096)
Purchase of treasury stock         (84) (84)
Exercise of stock options $ 12 348       360
Exercise of stock options (in shares) 12          
Stock compensation expense recognized in earnings   76       76
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (62,900)   (62,900)
Balance at Sep. 30, 2023 $ 96,444 $ 154,946 $ 2,922,712 $ (545,212) $ (435,279) $ 2,193,611
Balance (in shares) at Sep. 30, 2023 96,444