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Investments - Schedule of Investments Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Investments available for sale |  |
Amortized Cost | $ 4,836,528 | $ 4,897,607
Unrealized Gains | 10,678 | 98,747
Unrealized Losses | (184,301) | (33,467)
Fair Value | 4,662,905 | 4,962,887
U.S. Treasury securities |  |
Investments available for sale |  |
Amortized Cost | 437,450 | 447,926
Unrealized Gains | 368 | 3,833
Unrealized Losses | (14,178) | (2,966)
Fair Value | 423,640 | 448,793
U.S. agency securities |  |
Investments available for sale |  |
Amortized Cost |  | 5,501
Unrealized Gains |  | 3
Unrealized Losses |  | 0
Fair Value |  | 5,504
U.S. agency mortgage-backed securities |  |
Investments available for sale |  |
Amortized Cost | 902,741 | 1,005,611
Unrealized Gains | 689 | 13,365
Unrealized Losses | (48,655) | (10,113)
Fair Value | 854,775 | 1,008,863
Municipal debt securities |  |
Investments available for sale |  |
Amortized Cost | 530,839 | 598,764
Unrealized Gains | 3,836 | 30,122
Unrealized Losses | (22,490) | (1,287)
Fair Value | 512,185 | 627,599
Non-U.S. government securities |  |
Investments available for sale |  |
Amortized Cost | 73,097 | 77,366
Unrealized Gains | 1,411 | 3,232
Unrealized Losses | (2,765) | (855)
Fair Value | 71,743 | 79,743
Corporate debt securities |  |
Investments available for sale |  |
Amortized Cost | 1,339,172 | 1,428,645
Unrealized Gains | 2,845 | 36,067
Unrealized Losses | (58,373) | (9,465)
Fair Value | 1,283,644 | 1,455,247
Residential and commercial mortgage securities |  |
Investments available for sale |  |
Amortized Cost | 565,116 | 541,638
Unrealized Gains | 1,168 | 10,452
Unrealized Losses | (27,414) | (6,667)
Fair Value | 538,870 | 545,423
Asset-backed securities |  |
Investments available for sale |  |
Amortized Cost | 604,516 | 582,144
Unrealized Gains | 361 | 1,673
Unrealized Losses | (10,426) | (2,114)
Fair Value | 594,451 | 581,703
Money market funds |  |
Investments available for sale |  |
Amortized Cost | 383,597 | 210,012
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 383,597 | $ 210,012

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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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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