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Investments - Maturity Table (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,713,795 | $ 2,535,568
Estimated Fair Value | 2,566,556 | $ 2,517,956
2022 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 168,911 |
Estimated Fair Value | 167,988 |
2023 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 162,572 |
Estimated Fair Value | 158,500 |
2024 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 697,203 |
Estimated Fair Value | 671,600 |
2025 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 297,323 |
Estimated Fair Value | 289,516 |
2026 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 547,952 |
Estimated Fair Value | 502,996 |
2027 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 98,007 |
Estimated Fair Value | 98,111 |
2038 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 73 |
Estimated Fair Value | 76 |
2039 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 858 |
Estimated Fair Value | 875 |
2042 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,869 |
Estimated Fair Value | 2,605 |
2043 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,890 |
Estimated Fair Value | 4,626 |
2044 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,003 |
Estimated Fair Value | 5,766 |
2045 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,761 |
Estimated Fair Value | 5,409 |
2046 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,740 |
Estimated Fair Value | 8,138 |
2047 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,848 |
Estimated Fair Value | 9,394 |
2048 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,423 |
Estimated Fair Value | 2,373 |
2049 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 17,158 |
Estimated Fair Value | 16,122 |
2050 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 122,356 |
Estimated Fair Value | 104,863 |
2051 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 169,687 |
Estimated Fair Value | 144,802 |
2052 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 59,129 |
Estimated Fair Value | 54,486 |
2053 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 124,157 |
Estimated Fair Value | 116,111 |
2054 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 97,235 |
Estimated Fair Value | 91,559 |
2055 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 110,640 |
Estimated Fair Value | $ 110,640 |

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