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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 691,876 | $ 75,062
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8,249 | 357
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,204 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 33 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 694,080 | 75,062
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 8,282 | 357
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 | 102,905 | 4,997
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 665 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 102,905 | 4,997
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 665 | 3
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 | 323,227 | 4,079
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,871 | 33
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 557 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 13 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 323,784 | 4,079
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,884 | 33
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 205,761 | 65,986
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,710 | 321
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,647 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 20 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 207,408 | 65,986
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2,730 | $ 321
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 59,983 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 59,983 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 3 |

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