v3.26.1
Investments - Change in Net Unrealized Gains (Losses) on Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Roll Forward]        
Beginning balance $ 5,343,548 $ 5,119,407 $ 5,355,181 $ 4,996,096
Change in net unrealized investment gains (losses) (628) 48,254 (51,348) 107,148
Ending balance 5,395,535 5,223,128 5,395,535 5,223,128
Reclassification adjustments to net investment (gains) losses, tax (480) (1,585) (1,700) (2,242)
Amounts reclassified from accumulated other comprehensive income (loss)        
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Roll Forward]        
Beginning balance (75,311) (148,730) (24,591) (207,624)
Unrealized gains (losses) on investment securities (3,052) 53,888 (73,422) 125,736
Provision for income taxes 620 (11,595) 15,680 (27,020)
Change in unrealized gains (losses) on investment securities (2,432) 42,293 (57,742) 98,716
Reclassification adjustments to net investment (gains) losses, net of taxes of $(480) and $(1,585), respectively 1,804 5,961 6,394 8,432
Change in net unrealized investment gains (losses) (628) 48,254 (51,348) 107,148
Ending balance $ (75,939) $ (100,476) $ (75,939) $ (100,476)