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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Foreign currency translation adjustments:        
Change in unrealized foreign currency translation gains (losses) before income taxes $ (8,388) $ 4,736 $ 12,576 $ (8,536)
Change in unrealized foreign currency translation gains (losses), net of income taxes (8,388) 4,736 12,576 (8,536)
Unrealized gain (losses) on available-for-sale securities:        
Change in unrealized holding gains (losses) arising during period before income taxes 41,133 106,493 87,852 84,890
Income tax expense (benefit) on unrealized holding gains (losses) arising during period 8,736 22,769 18,541 18,053
Change in unrealized holding gains (losses) on available-for-sale securities arising during period, net of income taxes 32,397 83,724 69,311 66,837
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities 696 142 2,341 (429)
Income tax (expense) benefit on (gains) losses reclassified from accumulated OCI to net income 146 30 492 (90)
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities, net of income taxes 550 112 1,849 (339)
Change in unrealized gains (losses) on available-for-sale securities, net of income taxes and reclassification adjustment 32,947 83,836 71,160 66,498
Effect of change in discount rate assumptions on the LFPB:        
Change in effect in discount rate assumptions on the LFPB before income taxes (107,417) (346,794) (170,463) (40,910)
Income tax expense (benefit) on the effect of change in discount rate assumptions on the LFPB from accumulated OCI to net income (22,483) (74,112) (35,322) (8,755)
Change in effect in discount rate assumptions on the LFPB, net of income taxes $ (84,934) $ (272,682) $ (135,141) $ (32,155)