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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,154,867 | $ 725,830
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 90,505 | 7,842
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 75,909 | 13,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10,062 | 359
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,230,776 | 738,947
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 100,567 | 8,201
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 | 208,467 | 163,634
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11,431 | 1,775
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,109 | 4,874
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 891 | 126
Debt Securities, Available-for-sale, Unrealized Loss Position | 219,576 | 168,508
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 12,322 | 1,901
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 | 425,420 | 242,188
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 55,979 | 2,361
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 17,224 | 1,776
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,636 | 49
Debt Securities, Available-for-sale, Unrealized Loss Position | 442,644 | 243,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 59,615 | 2,410
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 405,833 | 259,047
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22,383 | 3,685
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 47,576 | 6,467
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,535 | 184
Debt Securities, Available-for-sale, Unrealized Loss Position | 453,409 | 265,514
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 27,918 | 3,869
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 105,513 | 60,961
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 596 | 21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 105,513 | 60,961
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 596 | $ 21
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 9,634 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 116 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 9,634 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 116 |

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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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