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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 208,286 | $ 127,160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,423 | 714
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,320,313 | 1,326,392
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 164,751 | 151,750
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,528,599 | 1,453,552
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 166,174 | 152,464
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 | 22,611 | 25,886
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 72 | 85
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 251,397 | 247,027
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 20,910 | 20,283
Debt Securities, Available-for-sale, Unrealized Loss Position | 274,008 | 272,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 20,982 | 20,368
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 | 479 | 1,168
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 420,164 | 428,171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 77,266 | 68,604
Debt Securities, Available-for-sale, Unrealized Loss Position | 420,643 | 429,339
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 77,268 | 68,767
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 125,634 | 58,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,240 | 417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 531,490 | 540,032
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 62,470 | 58,666
Debt Securities, Available-for-sale, Unrealized Loss Position | 657,124 | 598,281
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 63,710 | 59,083
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7,811 | 7,574
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 939 | 1,176
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,811 | 7,574
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 939 | 1,176
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 59,562 | 41,857
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 109 | 49
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 109,451 | 103,588
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,166 | 3,021
Debt Securities, Available-for-sale, Unrealized Loss Position | 169,013 | 145,445
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 3,275 | $ 3,070

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