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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Dec. 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 | $ 461,425 | $ 127,160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7,105 | 714
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,179,267 | 1,326,392
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 157,295 | 151,750
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,640,692 | 1,453,552
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 164,400 | 152,464
US Government-sponsored Enterprises Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 21,044 | 25,886
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 132 | 85
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 234,191 | 247,027
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 14,226 | 20,283
Debt Securities, Available-for-sale, Unrealized Loss Position | 255,235 | 272,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 14,358 | 20,368
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,117 | 1,168
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 143 | 163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 403,767 | 428,171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 83,568 | 68,604
Debt Securities, Available-for-sale, Unrealized Loss Position | 406,884 | 429,339
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 83,711 | 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 | 423,600 | 58,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,763 | 417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 478,790 | 540,032
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 57,410 | 58,666
Debt Securities, Available-for-sale, Unrealized Loss Position | 902,390 | 598,281
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 64,173 | 59,083
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 | 11,708 | 41,857
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 23 | 49
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 54,177 | 103,588
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,683 | 3,021
Debt Securities, Available-for-sale, Unrealized Loss Position | 65,885 | 145,445
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,706 | 3,070
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,956 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 44 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 8,342 | 7,574
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 408 | 1,176
Debt Securities, Available-for-sale, Unrealized Loss Position | 10,298 | 7,574
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 452 | $ 1,176

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