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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       34,838       34,838
Dividends:                
Payable/Cash       (35,128)       (35,128)
Purchase of treasury stock           (29,371)   (29,371)
Exercise of stock options $ 11 214           225
Exercise of stock options (in shares) 11              
Stock compensation expense recognized in earnings   219           219
Other comprehensive income, net of tax:                
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         62,007     62,007
Balance at Mar. 31, 2020 $ 96,226 148,508 $ (8,332) 2,191,946 64,352 (358,521) $ (8,332) 2,142,511
Balance (in shares) at Mar. 31, 2020 96,226              
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       50,771       50,771
Dividends:                
Payable/Cash       (34,813)       (34,813)
Purchase of treasury stock           (48)   (48)
Exercise of stock options $ 71 1,479           1,550
Exercise of stock options (in shares) 71              
Stock compensation expense recognized in earnings   159           159
Other comprehensive income, net of tax:                
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         (3,012)     (3,012)
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