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Parent Corporation Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
ASSETS        
Debt Securities, Available-for-sale, Fair Value $ 7,499,197 $ 6,612,107    
Equity securities 187,155 162,000    
Short-term investments 309,317 440,456    
Other investments 91,164 71,244    
Cash 180 26    
Current federal income tax 0 3,545    
Deferred federal income tax 140,237 172,733    
Other assets 199,760 202,491    
Total assets 11,802,546 10,802,261    
Liabilities:        
Long-term debt 503,946 504,676    
Other liabilities 548,398 517,234    
Total liabilities 8,848,165 8,274,697    
Stockholders’ Equity:        
Preferred stock of $0 par value per share (Note 17): Authorized shares: 5,000,000; Issued shares: 8,000 with $25,000 liquidation preference per share - 2023 and 2022 200,000 200,000    
Common stock of $2 par value per share: Authorized shares: 360,000,000 Issued: 105,223,307 - 2023; 104,847,111 - 2022 210,447 209,694    
Additional paid-in capital 522,748 493,488    
Retained earnings 3,029,396 2,749,703    
Accumulated other comprehensive income (loss) (373,001) (498,042)    
Treasury stock, at cost (shares: 44,586,870 - 2023; 44,508,211 - 2022) (635,209) (627,279)    
Total stockholders’ equity 2,954,381 2,527,564 $ 2,982,885  
Total liabilities and stockholders’ equity 11,802,546 10,802,261    
Parent Company [Member]        
ASSETS        
Debt Securities, Available-for-sale, Fair Value 421,089 387,535    
Equity securities 50,920 48,095    
Short-term investments 17,671 33,008    
Other investments 18,134 15,631    
Cash 180 26 $ 455 $ 394
Investment in subsidiaries 2,958,746 2,524,448    
Current federal income tax 9,006 8,894    
Deferred federal income tax 11,128 14,733    
Other assets 10,101 11,104    
Total assets 3,496,975 3,043,474    
Liabilities:        
Long-term debt 441,310 440,958    
Intercompany notes payable 81,465 56,266    
Accrued long-term stock compensation 10,522 11,101    
Other liabilities 9,297 7,585    
Total liabilities 542,594 515,910    
Stockholders’ Equity:        
Preferred stock of $0 par value per share (Note 17): Authorized shares: 5,000,000; Issued shares: 8,000 with $25,000 liquidation preference per share - 2023 and 2022 200,000 200,000    
Common stock of $2 par value per share: Authorized shares: 360,000,000 Issued: 105,223,307 - 2023; 104,847,111 - 2022 210,447 209,694    
Additional paid-in capital 522,748 493,488    
Retained earnings 3,029,396 2,749,703    
Accumulated other comprehensive income (loss) (373,001) (498,042)    
Treasury stock, at cost (shares: 44,586,870 - 2023; 44,508,211 - 2022) (635,209) (627,279)    
Total stockholders’ equity 2,954,381 2,527,564    
Total liabilities and stockholders’ equity $ 3,496,975 $ 3,043,474