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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)     101,643     101,643
Dividends:            
Cash/Payable     (39,151)     (39,151)
Purchase of treasury stock         (1,036) (1,036)
Exercise of stock options $ 4 81       85
Exercise of stock options (in shares) 4          
Stock compensation expense recognized in earnings   102       102
Other comprehensive (loss) income, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       50,006   50,006
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          
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)     97,331     97,331
Dividends:            
Cash/Payable     (41,031)     (41,031)
Purchase of treasury stock         (495) (495)
Exercise of stock options $ 103 2,190       2,293
Exercise of stock options (in shares) 103          
Stock compensation expense recognized in earnings   74       74
Other comprehensive (loss) income, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (22,056)   (22,056)
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