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Investments - Schedule of Investments Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investments available for sale |  |
Amortized Cost | $ 5,502,929 | $ 5,184,856
Unrealized Gains | 604 | 4,273
Unrealized Losses | (505,845) | (447,504)
Fair Value | 4,997,688 | 4,741,625
U.S. Treasury securities |  |
Investments available for sale |  |
Amortized Cost | 909,138 | 584,173
Unrealized Gains | 24 | 341
Unrealized Losses | (29,977) | (28,076)
Fair Value | 879,185 | 556,438
U.S. agency securities |  |
Investments available for sale |  |
Amortized Cost | 7,198 | 49,059
Unrealized Gains | 0 | 7
Unrealized Losses | (18) | (8)
Fair Value | 7,180 | 49,058
U.S. agency mortgage-backed securities |  |
Investments available for sale |  |
Amortized Cost | 898,677 | 898,675
Unrealized Gains | 0 | 258
Unrealized Losses | (147,739) | (115,190)
Fair Value | 750,938 | 783,743
Municipal debt securities |  |
Investments available for sale |  |
Amortized Cost | 637,536 | 661,934
Unrealized Gains | 64 | 2,010
Unrealized Losses | (75,090) | (61,254)
Fair Value | 562,510 | 602,690
Non-U.S. government securities |  |
Investments available for sale |  |
Amortized Cost | 57,407 | 69,651
Unrealized Gains | 0 | 0
Unrealized Losses | (8,836) | (7,252)
Fair Value | 48,571 | 62,399
Corporate debt securities |  |
Investments available for sale |  |
Amortized Cost | 1,428,873 | 1,546,513
Unrealized Gains | 144 | 1,195
Unrealized Losses | (148,584) | (133,387)
Fair Value | 1,280,433 | 1,414,321
Residential and commercial mortgage securities |  |
Investments available for sale |  |
Amortized Cost | 563,358 | 577,915
Unrealized Gains | 218 | 390
Unrealized Losses | (69,883) | (66,481)
Fair Value | 493,693 | 511,824
Asset-backed securities |  |
Investments available for sale |  |
Amortized Cost | 640,382 | 660,345
Unrealized Gains | 154 | 72
Unrealized Losses | (25,718) | (35,856)
Fair Value | 614,818 | 624,561
Money market funds |  |
Investments available for sale |  |
Amortized Cost | 360,360 | 136,591
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 360,360 | $ 136,591

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