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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Adjustment
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Adjustment
Total
Balance at Dec. 31, 2018   $ 96,104 $ 145,283   $ 2,064,134 $ (54,634) $ (311,305)   $ 1,939,582
Balance (in shares) at Dec. 31, 2018 96,104                
Increase (decrease) in shareholders' equity                  
Net income         205,104       205,104
Dividends:                  
Cash         (68,670)       (68,670)
Purchase of treasury stock             (17,845)   (17,845)
Exercise of stock options   111 1,812           1,923
Exercise of stock options (in shares) 111                
Stock compensation expense recognized in earnings     980           980
Other comprehensive (loss) income, net of tax:                  
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments           56,979     56,979
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:                  
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) income, 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:                  
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) income, 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