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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Surplus
Retained Earnings
Adjustment
Retained Earnings
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       76,348       76,348
Dividends:                
Payable/Cash       (35,128)       (35,128)
Purchase of treasury stock           (48,737)   (48,737)
Exercise of stock options $ 14 274           288
Exercise of stock options (in shares) 14              
Stock compensation expense recognized in earnings   395           395
Other comprehensive income, net of tax:                
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         38,974     38,974
Balance at Jun. 30, 2020 $ 96,229 148,744 $ (8,333) 2,233,455 41,319 (377,887) $ (8,333) 2,141,860
Balance (in shares) at Jun. 30, 2020 96,229              
Balance at Mar. 31, 2020 $ 96,226 148,508   2,191,946 64,352 (358,521)   2,142,511
Balance (in shares) at Mar. 31, 2020 96,226              
Increase (decrease) in shareholders' equity                
Net Income       41,509       41,509
Dividends:                
Purchase of treasury stock           (19,366)   (19,366)
Exercise of stock options $ 3 59           62
Exercise of stock options (in shares) 3              
Stock compensation expense recognized in earnings   177           177
Other comprehensive income, net of tax:                
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         (23,033)     (23,033)
Balance at Jun. 30, 2020 $ 96,229 148,744 $ (8,333) 2,233,455 41,319 (377,887) $ (8,333) 2,141,860
Balance (in shares) at Jun. 30, 2020 96,229              
Balance at Dec. 31, 2020 $ 96,241 149,334   2,289,626 20,825 (378,028)   2,177,998
Balance (in shares) at Dec. 31, 2020 96,241              
Increase (decrease) in shareholders' equity                
Net Income       142,797       142,797
Dividends:                
Payable/Cash       (34,813)       (34,813)
Purchase of treasury stock           (48)   (48)
Exercise of stock options $ 91 1,905           1,996
Exercise of stock options (in shares) 91              
Stock compensation expense recognized in earnings   273           273
Other comprehensive income, net of tax:                
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         (2,533)     (2,533)
Balance at Jun. 30, 2021 $ 96,332 151,512   2,397,610 18,292 (378,076)   2,285,670
Balance (in shares) at Jun. 30, 2021 96,332              
Balance at Mar. 31, 2021 $ 96,312 150,972   2,305,584 17,813 (378,076)   2,192,605
Balance (in shares) at Mar. 31, 2021 96,312              
Increase (decrease) in shareholders' equity                
Net Income       92,026       92,026
Dividends:                
Exercise of stock options $ 20 426           446
Exercise of stock options (in shares) 20              
Stock compensation expense recognized in earnings   114           114
Other comprehensive income, net of tax:                
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         479     479
Balance at Jun. 30, 2021 $ 96,332 $ 151,512   $ 2,397,610 $ 18,292 $ (378,076)   $ 2,285,670
Balance (in shares) at Jun. 30, 2021 96,332