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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated 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     53,493     53,493
Dividends:            
Payable/Cash     (38,026)     (38,026)
Purchase of treasury stock         (3,380) (3,380)
Exercise of stock options $ 6 140       146
Exercise of stock options (in shares) 6          
Stock compensation expense recognized in earnings   121       121
Other comprehensive loss, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (173,156)   (173,156)
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          
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     101,643     101,643
Dividends:            
Payable/Cash     (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, 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