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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 385,591 | $ 722,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10,186 | 45,806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,084,696 | 756,002
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 152,113 | 147,922
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,470,287 | 1,478,678
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 162,299 | 193,728
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 31,351 | 73,738
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 671 | 6,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 224,294 | 163,047
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 23,279 | 22,056
Debt Securities, Available-for-sale, Unrealized Loss Position | 255,645 | 236,785
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 23,950 | 28,305
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,954 | 103,179
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 165 | 13,501
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 424,582 | 311,634
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 73,078 | 76,924
Debt Securities, Available-for-sale, Unrealized Loss Position | 426,536 | 414,813
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 73,243 | 90,425
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 198,052 | 334,431
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,861 | 20,038
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 407,782 | 281,321
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 53,887 | 48,942
Debt Securities, Available-for-sale, Unrealized Loss Position | 605,834 | 615,752
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 60,748 | 68,980
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,664 | 12,640
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 336 | 1,110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,243 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 507 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,907 | 12,640
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 843 | 1,110
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 150,570 | 198,688
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,153 | 4,908
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 23,795 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,362 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 174,365 | 198,688
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 3,515 | $ 4,908

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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