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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]
Adjustment
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Adjustment
Total
Balance at Dec. 31, 2017   $ 96,019 $ 171,816   $ 1,891,805   $ (28,397) $ (292,263)   $ 1,838,980
Balance (in shares) at Dec. 31, 2017 96,019                  
Increase (decrease) in shareholders' equity                    
Net Income         215,931         215,931
Dividends:                    
Payable/Cash         (49,599)         (49,599)
Purchase of treasury stock               (19,042)   (19,042)
Exercise of stock options   85 1,437             1,522
Exercise of stock options (in shares) 85                  
Stock compensation expense recognized in earnings     1,035             1,035
Repurchase of outstanding warrant     (29,005)             (29,005)
Other comprehensive income, net of tax:                    
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments             (20,240)     (20,240)
Balance at Dec. 31, 2018   96,104 145,283 $ 5,997 2,064,134 $ (5,997) (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:                    
Payable/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 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:                    
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 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