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Investments - Maturity Table (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,440,204 | $ 2,535,568
Estimated Fair Value | 2,341,551 | $ 2,517,956
2022 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 194,309 |
Estimated Fair Value | 193,447 |
2023 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 162,595 |
Estimated Fair Value | 159,383 |
2024 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 597,268 |
Estimated Fair Value | 577,077 |
2025 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 297,077 |
Estimated Fair Value | 293,021 |
2026 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 547,832 |
Estimated Fair Value | 512,323 |
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 | 873 |
Estimated Fair Value | 916 |
2042 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,912 |
Estimated Fair Value | 2,768 |
2043 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,415 |
Estimated Fair Value | 5,336 |
2044 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,015 |
Estimated Fair Value | 6,959 |
2045 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,158 |
Estimated Fair Value | 6,018 |
2046 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,374 |
Estimated Fair Value | 9,085 |
2047 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,957 |
Estimated Fair Value | 9,751 |
2048 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,427 |
Estimated Fair Value | 2,437 |
2049 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 18,261 |
Estimated Fair Value | 17,902 |
2050 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 127,490 |
Estimated Fair Value | 116,445 |
2051 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 174,646 |
Estimated Fair Value | 159,542 |
2052 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 40,972 |
Estimated Fair Value | 38,693 |
2053 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 132,336 |
Estimated Fair Value | 128,621 |
2054 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 103,214 |
Estimated Fair Value | $ 101,751 |

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