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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)     111,464     111,464
Dividends:            
Cash     (38,026)     (38,026)
Purchase of treasury stock         (40,549) (40,549)
Exercise of stock options $ 17 370       387
Exercise of stock options (in shares) 17          
Stock compensation expense recognized in earnings   229       229
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (244,755)   (244,755)
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          
Balance at Mar. 31, 2022 $ 96,357 152,405 2,486,177 (205,136) (382,124) 2,147,679
Balance (in shares) at Mar. 31, 2022 96,357          
Increase (decrease) in shareholders' equity            
Net Income (Loss)     57,971     57,971
Dividends:            
Purchase of treasury stock         (37,169) (37,169)
Exercise of stock options $ 11 230       241
Exercise of stock options (in shares) 11          
Stock compensation expense recognized in earnings   108       108
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (71,599)   (71,599)
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          
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)     202,128     202,128
Dividends:            
Cash     (39,151)     (39,151)
Purchase of treasury stock         (4,403) (4,403)
Exercise of stock options $ 12 282       294
Exercise of stock options (in shares) 12          
Stock compensation expense recognized in earnings   179       179
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (11,815)   (11,815)
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          
Balance at Mar. 31, 2023 $ 96,424 154,244 2,758,059 (420,491) (431,828) 2,156,408
Balance (in shares) at Mar. 31, 2023 96,424          
Increase (decrease) in shareholders' equity            
Net Income (Loss)     100,485     100,485
Dividends:            
Purchase of treasury stock         (3,367) (3,367)
Exercise of stock options $ 8 201       209
Exercise of stock options (in shares) 8          
Stock compensation expense recognized in earnings   77       77
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (61,821)   (61,821)
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