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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Dec. 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 | $ 127,160 | $ 722,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 714 | 45,806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,326,392 | 756,002
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 151,750 | 147,922
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,453,552 | 1,478,678
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 152,464 | 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 | 25,886 | 73,738
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 85 | 6,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 247,027 | 163,047
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 20,283 | 22,056
Debt Securities, Available-for-sale, Unrealized Loss Position | 272,913 | 236,785
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 20,368 | 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 | 1,168 | 103,179
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 163 | 13,501
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 428,171 | 311,634
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 68,604 | 76,924
Debt Securities, Available-for-sale, Unrealized Loss Position | 429,339 | 414,813
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 68,767 | 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 | 58,249 | 334,431
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 417 | 20,038
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 540,032 | 281,321
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 58,666 | 48,942
Debt Securities, Available-for-sale, Unrealized Loss Position | 598,281 | 615,752
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 59,083 | 68,980
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 41,857 | 198,688
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 49 | 4,908
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 103,588 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,021 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 145,445 | 198,688
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3,070 | 4,908
Corporate Debt Securities [Member] |  |
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 | 7,574 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,176 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,574 | 12,640
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,176 | $ 1,110

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