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Investments - Maturity Table (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,554,332 | $ 2,535,568
Estimated Fair Value | 2,342,089 | $ 2,517,956
2023 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 162,526 |
Estimated Fair Value | 159,078 |
2024 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 697,970 |
Estimated Fair Value | 663,206 |
2025 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 297,822 |
Estimated Fair Value | 283,197 |
2026 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 548,199 |
Estimated Fair Value | 489,551 |
2027 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 98,210 |
Estimated Fair Value | 94,277 |
2038 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 71 |
Estimated Fair Value | 73 |
2039 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 740 |
Estimated Fair Value | 731 |
2042 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,699 |
Estimated Fair Value | 2,331 |
2043 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,573 |
Estimated Fair Value | 4,096 |
2044 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,464 |
Estimated Fair Value | 5,012 |
2045 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,520 |
Estimated Fair Value | 4,912 |
2046 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,110 |
Estimated Fair Value | 7,151 |
2047 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,470 |
Estimated Fair Value | 7,502 |
2048 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,149 |
Estimated Fair Value | 2,070 |
2049 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 16,482 |
Estimated Fair Value | 14,645 |
2050 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 117,659 |
Estimated Fair Value | 94,680 |
2051 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 163,803 |
Estimated Fair Value | 130,870 |
2052 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 56,910 |
Estimated Fair Value | 49,518 |
2053 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 111,518 |
Estimated Fair Value | 100,258 |
2054 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 88,335 |
Estimated Fair Value | 79,101 |
2055 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 102,497 |
Estimated Fair Value | 96,290 |
2058 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 54,605 |
Estimated Fair Value | $ 53,540 |

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