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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 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 | $ 1,094,865 | $ 725,830
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 139,104 | 7,842
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 370,061 | 13,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 86,599 | 359
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,464,926 | 738,947
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 225,703 | 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 | 138,491 | 163,634
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 15,104 | 1,775
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 96,448 | 4,874
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 13,674 | 126
Debt Securities, Available-for-sale, Unrealized Loss Position | 234,939 | 168,508
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 28,778 | 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 | 261,078 | 242,188
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 75,462 | 2,361
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 126,173 | 1,776
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 44,821 | 49
Debt Securities, Available-for-sale, Unrealized Loss Position | 387,251 | 243,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 120,283 | 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 | 473,629 | 259,047
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 42,796 | 3,685
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 147,440 | 6,467
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 28,104 | 184
Debt Securities, Available-for-sale, Unrealized Loss Position | 621,069 | 265,514
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 70,900 | 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 | 208,754 | 60,961
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,905 | 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 | 208,754 | 60,961
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,905 | $ 21
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 12,913 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 837 |
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 | 12,913 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 837 |

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