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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 323,104 | $ 722,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7,828 | 45,806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,195,337 | 756,002
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 172,224 | 147,922
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,518,441 | 1,478,678
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 180,052 | 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 | 48,444 | 73,738
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,048 | 6,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 221,131 | 163,047
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 26,272 | 22,056
Debt Securities, Available-for-sale, Unrealized Loss Position | 269,575 | 236,785
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 27,320 | 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 | 2,324 | 103,179
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 191 | 13,501
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 417,374 | 311,634
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 79,651 | 76,924
Debt Securities, Available-for-sale, Unrealized Loss Position | 419,698 | 414,813
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 79,842 | 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 | 151,797 | 334,431
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5,165 | 20,038
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 473,248 | 281,321
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 61,842 | 48,942
Debt Securities, Available-for-sale, Unrealized Loss Position | 625,045 | 615,752
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 67,007 | 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 | 1,807 | 12,640
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 193 | 1,110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,665 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,085 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,472 | 12,640
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,278 | 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 | 118,732 | 198,688
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,231 | 4,908
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 77,919 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,374 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 196,651 | 198,688
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 4,605 | $ 4,908

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