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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Other comprehensive income (loss):    
Other comprehensive (loss) income $ 83,033 $ (24,888)
Other comprehensive income (loss):    
Other comprehensive (loss) income, tax effect (11,295) 3,122
Net of Tax    
Balance, beginning of period 5,603,658  
Other comprehensive income (loss):    
Total other comprehensive income (loss) 71,738 (21,766)
Balance, end of period 5,659,306 5,226,154
Accumulated Other Comprehensive Loss    
Before Tax    
AOCI before tax, beginning of period (354,298) (322,992)
Other comprehensive income (loss):    
AOCI before tax, end of period (271,265) (347,880)
Tax Effect    
AOCI tax effect, beginning of period 50,314 42,496
Other comprehensive income (loss):    
AOCI tax effect, end of period 39,019 45,618
Net of Tax    
Balance, beginning of period (303,984) (280,496)
Other comprehensive income (loss):    
Total other comprehensive income (loss) 71,738 (21,766)
Balance, end of period (232,246) (302,262)
Accumulated Net Investment Gains (Losses) On Investments    
Other comprehensive income (loss):    
Unrealized holding gains (losses) arising during the period 82,852 (26,028)
Less: Reclassification adjustment for (gains) losses included in net income 181 1,140
Other comprehensive (loss) income 83,033 (24,888)
Other comprehensive income (loss):    
Unrealized holding gains (losses) arising during the period (11,257) 3,366
Less: Reclassification adjustment for gains (loss) included in net income (38) (244)
Other comprehensive (loss) income, tax effect (11,295) 3,122
Other comprehensive income (loss):    
Unrealized holding (losses) gains arising during the year, net of tax 71,595 (22,662)
Less: Reclassification adjustment for (gains) losses included in net income 143 896
Total other comprehensive income (loss) $ 71,738 $ (21,766)