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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Sep. 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 | $ 226,694 | $ 722,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,650 | 45,806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,258,092 | 756,002
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 230,371 | 147,922
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,484,786 | 1,478,678
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 235,021 | 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 | 43,940 | 73,738
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 800 | 6,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 235,517 | 163,047
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 27,924 | 22,056
Debt Securities, Available-for-sale, Unrealized Loss Position | 279,457 | 236,785
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 28,724 | 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 | 3,687 | 103,179
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 467 | 13,501
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 383,239 | 311,634
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 113,622 | 76,924
Debt Securities, Available-for-sale, Unrealized Loss Position | 386,926 | 414,813
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 114,089 | 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 | 102,488 | 334,431
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,210 | 20,038
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 523,672 | 281,321
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 82,716 | 48,942
Debt Securities, Available-for-sale, Unrealized Loss Position | 626,160 | 615,752
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 85,926 | 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 | 0 | 12,640
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 1,110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7,452 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,298 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,452 | 12,640
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,298 | 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 | 76,579 | 198,688
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 173 | 4,908
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 108,212 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,811 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 184,791 | 198,688
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 4,984 | $ 4,908

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