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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other comprehensive income (loss):      
Other comprehensive (losses) gain, before tax $ (31,306) $ 120,238  
Other comprehensive income (loss):      
Other comprehensive (losses) gain, tax effect 7,818 (17,944)  
Net of Tax      
Balance, beginning of year 5,102,550 4,462,309  
Other comprehensive income (loss):      
Total other comprehensive income (loss) (23,488) 102,294 $ (433,497)
Balance, end of year 5,603,658 5,102,550 4,462,309
Accumulated Other Comprehensive Income (Loss)      
Before Tax      
AOCI before tax, beginning of year (322,992) (443,230)  
Other comprehensive income (loss):      
AOCI before tax, end of year (354,298) (322,992) (443,230)
Tax Effect      
AOCI tax effect, beginning of year 42,496 60,440  
Other comprehensive income (loss):      
AOCI tax effect, end of year 50,314 42,496 60,440
Net of Tax      
Balance, beginning of year (280,496) (382,790) 50,707
Other comprehensive income (loss):      
Total other comprehensive income (loss) (23,488) 102,294 (433,497)
Balance, end of year (303,984) (280,496) $ (382,790)
Accumulated Net Investment Gains (Losses) On Investments      
Other comprehensive income (loss):      
Unrealized holding (losses) gains arising during the year, before tax (33,656) 113,034  
Less: Reclassification adjustment for losses (gains) included in net income 2,350 7,204  
Other comprehensive (losses) gain, before tax (31,306) 120,238  
Other comprehensive income (loss):      
Unrealized holding (losses) gains arising during the year, tax effect 8,260 (16,633)  
Less: Reclassification adjustment for losses (gains) included in net income (442) (1,311)  
Other comprehensive (losses) gain, tax effect 7,818 (17,944)  
Other comprehensive income (loss):      
Unrealized holding (losses) gains arising during the year, net of tax (25,396) 96,401  
Less: Reclassification adjustment for losses (gains) included in net income 1,908 5,893  
Total other comprehensive income (loss) $ (23,488) $ 102,294