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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, 2023 $ 96,467 $ 155,511 $ 3,029,088 $ (397,889) $ (435,403) $ 2,447,774
Balance (in shares) at Dec. 31, 2023 96,467          
Increase (decrease) in shareholders' equity            
Net income     294,083     294,083
Dividends:            
Dividends Payable/ Cash     (82,078)     (82,078)
Purchase of treasury stock         (742) (742)
Exercise of stock options $ 136 3,160       3,296
Exercise of stock options (in shares) 136          
Stock compensation expense recognized in earnings   169       169
Other comprehensive income, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       86,914   86,914
Balance at Sep. 30, 2024 $ 96,603 158,840 3,241,093 (310,975) (436,145) 2,749,416
Balance (in shares) at Sep. 30, 2024 96,603          
Balance at Jun. 30, 2024 $ 96,580 158,171 3,182,368 (423,860) (435,898) 2,577,361
Balance (in shares) at Jun. 30, 2024 96,580          
Increase (decrease) in shareholders' equity            
Net income     99,772     99,772
Dividends:            
Dividends Payable/ Cash     (41,047)     (41,047)
Purchase of treasury stock         (247) (247)
Exercise of stock options $ 23 622       645
Exercise of stock options (in shares) 23          
Stock compensation expense recognized in earnings   47       47
Other comprehensive income, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       112,885   112,885
Balance at Sep. 30, 2024 $ 96,603 158,840 3,241,093 (310,975) (436,145) 2,749,416
Balance (in shares) at Sep. 30, 2024 96,603          
Balance at Dec. 31, 2024 $ 96,617 159,333 3,356,177 (379,054) (436,366) 2,796,707
Balance (in shares) at Dec. 31, 2024 96,617          
Increase (decrease) in shareholders' equity            
Net income     305,409     305,409
Dividends:            
Dividends Payable/ Cash     (87,061)     (87,061)
Purchase of treasury stock         (4,546) (4,546)
Exercise of stock options $ 36 1,212       1,248
Exercise of stock options (in shares) 36          
Stock compensation expense recognized in earnings   86       86
Other comprehensive income, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       115,965   115,965
Balance at Sep. 30, 2025 $ 96,653 160,631 3,574,525 (263,089) (440,912) 3,127,808
Balance (in shares) at Sep. 30, 2025 96,653          
Balance at Jun. 30, 2025 $ 96,640 160,169 3,509,661 (303,489) (440,912) 3,022,069
Balance (in shares) at Jun. 30, 2025 96,640          
Increase (decrease) in shareholders' equity            
Net income     108,375     108,375
Dividends:            
Dividends Payable/ Cash     (43,511)     (43,511)
Exercise of stock options $ 13 442       455
Exercise of stock options (in shares) 13          
Stock compensation expense recognized in earnings   20       20
Other comprehensive income, net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       40,400   40,400
Balance at Sep. 30, 2025 $ 96,653 $ 160,631 $ 3,574,525 $ (263,089) $ (440,912) $ 3,127,808
Balance (in shares) at Sep. 30, 2025 96,653