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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock
Common Stock
Additional Paid-in Capital
Retained Earnings
Adjustment
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Adjustment
Total
Balance at Dec. 31, 2019   $ 96,215 $ 148,075   $ 2,200,568 $ 2,345 $ (329,150)   $ 2,118,053
Balance (in shares) at Dec. 31, 2019 96,215                
Increase (decrease) in shareholders' equity                  
Net income         167,319       167,319
Dividends:                  
Payable/Cash         (69,928)       (69,928)
Purchase of treasury stock             (48,878)   (48,878)
Exercise of stock options   26 516           542
Exercise of stock options (in shares) 26                
Stock compensation expense recognized in earnings     743           743
Other comprehensive loss, net of tax:                  
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments           18,480     18,480
Balance at Dec. 31, 2020   96,241 149,334 $ (8,333) 2,289,626 20,825 (378,028) $ (8,333) 2,177,998
Balance (in shares) at Dec. 31, 2020 96,241                
Increase (decrease) in shareholders' equity                  
Net income         253,922       253,922
Dividends:                  
Payable/Cash         (72,838)       (72,838)
Purchase of treasury stock             (716)   (716)
Exercise of stock options   110 2,304           2,414
Exercise of stock options (in shares) 110                
Stock compensation expense recognized in earnings     506           506
Other comprehensive loss, net of tax:                  
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments           (52,805)     (52,805)
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         300,232       300,232
Dividends:                  
Payable/Cash         (75,375)       (75,375)
Purchase of treasury stock             (52,048)   (52,048)
Exercise of stock options   69 1,468           1,537
Exercise of stock options (in shares) 69                
Stock compensation expense recognized in earnings     449           449
Other comprehensive loss, net of tax:                  
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments           (438,517)     (438,517)
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