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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Surplus
Retained Earnings
Other Comprehensive Income (Loss)
Treasury Stock
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     53,420     53,420
Dividends:            
Payable ($.50 and $.33 per share) for the period ended March 31, 2019 and 2018, respectively)     (21,814)     (21,814)
Exercise of stock options $ 25 415       440
Exercise of stock options (in shares) 25          
Stock compensation expense recognized in earnings   185       185
Other comprehensive income (loss), net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (39,953)   (39,953)
Balance at Mar. 31, 2018 $ 96,044 172,416 1,923,411 (68,350) (292,263) 1,831,258
Balance (in shares) at Mar. 31, 2018 96,044          
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     51,906     51,906
Dividends:            
Payable ($.50 and $.33 per share) for the period ended March 31, 2019 and 2018, respectively)     (32,822)     (32,822)
Purchase of treasury stock (1,305 and 0 shares) for the period ended March 31, 2019 and 2018, respectively)         (54) (54)
Exercise of stock options $ 33 565       598
Exercise of stock options (in shares) 33          
Stock compensation expense recognized in earnings   265       265
Other comprehensive income (loss), net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       25,229   25,229
Balance at Mar. 31, 2019 $ 96,137 $ 146,113 $ 2,083,218 $ (29,405) $ (311,359) $ 1,984,704
Balance (in shares) at Mar. 31, 2019 96,137