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Investments - Schedule of Investments Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Investments available for sale |  |
Amortized Cost | $ 5,325,085 | $ 5,184,856
Unrealized Gains | 11,188 | 4,273
Unrealized Losses | (386,237) | (447,504)
Fair Value | 4,950,036 | 4,741,625
U.S. Treasury securities |  |
Investments available for sale |  |
Amortized Cost | 497,267 | 584,173
Unrealized Gains | 843 | 341
Unrealized Losses | (22,326) | (28,076)
Fair Value | 475,784 | 556,438
U.S. agency securities |  |
Investments available for sale |  |
Amortized Cost | 12,696 | 49,059
Unrealized Gains | 8 | 7
Unrealized Losses | (14) | (8)
Fair Value | 12,690 | 49,058
U.S. agency mortgage-backed securities |  |
Investments available for sale |  |
Amortized Cost | 950,645 | 898,675
Unrealized Gains | 1,286 | 258
Unrealized Losses | (101,807) | (115,190)
Fair Value | 850,124 | 783,743
Municipal debt securities |  |
Investments available for sale |  |
Amortized Cost | 650,470 | 661,934
Unrealized Gains | 5,489 | 2,010
Unrealized Losses | (46,949) | (61,254)
Fair Value | 609,010 | 602,690
Non-U.S. government securities |  |
Investments available for sale |  |
Amortized Cost | 69,606 | 69,651
Unrealized Gains | 0 | 0
Unrealized Losses | (6,588) | (7,252)
Fair Value | 63,018 | 62,399
Corporate debt securities |  |
Investments available for sale |  |
Amortized Cost | 1,575,643 | 1,546,513
Unrealized Gains | 3,040 | 1,195
Unrealized Losses | (116,087) | (133,387)
Fair Value | 1,462,596 | 1,414,321
Residential and commercial mortgage securities |  |
Investments available for sale |  |
Amortized Cost | 601,606 | 577,915
Unrealized Gains | 208 | 390
Unrealized Losses | (59,801) | (66,481)
Fair Value | 542,013 | 511,824
Asset-backed securities |  |
Investments available for sale |  |
Amortized Cost | 680,460 | 660,345
Unrealized Gains | 314 | 72
Unrealized Losses | (32,665) | (35,856)
Fair Value | 648,109 | 624,561
Money market funds |  |
Investments available for sale |  |
Amortized Cost | 286,692 | 136,591
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 286,692 | $ 136,591

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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