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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock
Common Stock
Surplus
Retained Earnings
Other Comprehensive Income (Loss)
Treasury Stock
Total
Balance at Dec. 31, 2016   $ 95,910 $ 169,567 $ 1,777,963 $ (26,697) $ (292,076) $ 1,724,667
Balance (in shares) at Dec. 31, 2016 95,910            
Increase (decrease) in shareholders' equity              
Net Income       157,436     157,436
Dividends:              
Dividends       (43,594)     (43,594)
Purchase of treasury stock           (187) (187)
Exercise of stock options   109 1,346       1,455
Exercise of stock options (in shares) 109            
Stock compensation expense recognized in earnings     903       903
Other comprehensive income, net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         (1,700)   (1,700)
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:              
Dividends       (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 2,064,134 (54,634) (311,305) 1,939,582
Balance (in shares) at Dec. 31, 2018 96,104            
Dividends:              
Cumulative adjustment for adoption of new accounting standards       5,997 (5,997)    
Net Income       205,104     205,104
Dividends       (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