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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, 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          
Balance at Dec. 31, 2023 $ 96,467 155,511 3,029,088 (397,889) (435,403) 2,447,774
Balance (in shares) at Dec. 31, 2023 96,467          
Increase (decrease) in shareholders' equity            
Net Income (Loss)     194,311     194,311
Dividends:            
Cash     (41,031)     (41,031)
Purchase of treasury stock         (495) (495)
Exercise of stock options $ 113 2,538       2,651
Exercise of stock options (in shares) 113          
Stock compensation expense recognized in earnings   122       122
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (25,971)   (25,971)
Balance at Jun. 30, 2024 $ 96,580 158,171 3,182,368 (423,860) (435,898) 2,577,361
Balance (in shares) at Jun. 30, 2024 96,580          
Balance at Mar. 31, 2024 $ 96,570 157,775 3,085,388 (419,945) (435,898) 2,483,890
Balance (in shares) at Mar. 31, 2024 96,570          
Increase (decrease) in shareholders' equity            
Net Income (Loss)     96,980     96,980
Dividends:            
Exercise of stock options $ 10 348       358
Exercise of stock options (in shares) 10          
Stock compensation expense recognized in earnings   48       48
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (3,915)   (3,915)
Balance at Jun. 30, 2024 $ 96,580 $ 158,171 $ 3,182,368 $ (423,860) $ (435,898) $ 2,577,361
Balance (in shares) at Jun. 30, 2024 96,580