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Parent Corporation Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
ASSETS        
Debt Securities, Available-for-sale, Fair Value $ 6,612,107 $ 6,709,976    
Equity securities 162,000 335,537    
Short-term investments 440,456 447,863    
Other investments 71,244 49,300    
Cash 26 455    
Current federal income tax 3,545 772    
Deferred federal income tax 172,733 0    
Other assets 202,491 195,240    
Total assets 10,802,261 10,461,389    
Liabilities:        
Long-term debt 504,676 506,050    
Other liabilities 517,234 453,874    
Total liabilities 8,274,697 7,478,504    
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 - 2022 and 2021 200,000 200,000    
Common stock of $2 par value per share: Authorized shares: 360,000,000 Issued: 104,847,111 - 2022; 104,450,916 - 2021 209,694 208,902    
Additional paid-in capital 493,488 464,347    
Retained earnings 2,749,703 2,603,472    
Accumulated other comprehensive (loss) income (498,042) 115,099    
Treasury stock, at cost (shares: 44,508,211 - 2022; 44,266,534 - 2021) (627,279) (608,935)    
Total stockholders’ equity 2,527,564 2,982,885 $ 2,738,889  
Total liabilities and stockholders’ equity 10,802,261 10,461,389    
Parent Company [Member]        
ASSETS        
Debt Securities, Available-for-sale, Fair Value 387,535 325,014    
Equity securities 48,095 136,362    
Short-term investments 33,008 56,042    
Other investments 15,631 9,241    
Cash 26 455 $ 394 $ 300
Investment in subsidiaries 2,524,448 2,954,725    
Current federal income tax 8,894 7,208    
Deferred federal income tax 14,733 4,487    
Other assets 11,104 9,178    
Total assets 3,043,474 3,502,712    
Liabilities:        
Long-term debt 440,958 440,600    
Intercompany notes payable 56,266 57,980    
Accrued long-term stock compensation 11,101 10,965    
Other liabilities 7,585 10,282    
Total liabilities 515,910 519,827    
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 - 2022 and 2021 200,000 200,000    
Common stock of $2 par value per share: Authorized shares: 360,000,000 Issued: 104,847,111 - 2022; 104,450,916 - 2021 209,694 208,902    
Additional paid-in capital 493,488 464,347    
Retained earnings 2,749,703 2,603,472    
Accumulated other comprehensive (loss) income (498,042) 115,099    
Treasury stock, at cost (shares: 44,508,211 - 2022; 44,266,534 - 2021) (627,279) (608,935)    
Total stockholders’ equity 2,527,564 2,982,885    
Total liabilities and stockholders’ equity $ 3,043,474 $ 3,502,712