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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 208,781 | $ 127,160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,458 | 714
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,303,045 | 1,326,392
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 171,795 | 151,750
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,511,826 | 1,453,552
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 173,253 | 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 | 20,179 | 25,886
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 85 | 85
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 259,528 | 247,027
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 19,590 | 20,283
Debt Securities, Available-for-sale, Unrealized Loss Position | 279,707 | 272,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 19,675 | 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 | 1,905 | 1,168
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 32 | 163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 405,833 | 428,171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 86,070 | 68,604
Debt Securities, Available-for-sale, Unrealized Loss Position | 407,738 | 429,339
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 86,102 | 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 | 124,783 | 58,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,207 | 417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 533,940 | 540,032
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 62,406 | 58,666
Debt Securities, Available-for-sale, Unrealized Loss Position | 658,723 | 598,281
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 63,613 | 59,083
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 | 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 | 7,830 | 7,574
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 920 | 1,176
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,830 | 7,574
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 920 | 1,176
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 61,914 | 41,857
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 134 | 49
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 95,914 | 103,588
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,809 | 3,021
Debt Securities, Available-for-sale, Unrealized Loss Position | 157,828 | 145,445
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,943 | $ 3,070

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