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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities | $ 283 | $ 19
Derivative liabilities | $ 44,000 | $ 38,000
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs | 3.00% | 3.00%
Derivative assets | $ 31,000 | $ 27,000
Derivative assets | 31,000 | 28,000
Warrants [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Derivative assets | 1,000 | 1,000
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Other investments | $ 480,000 | $ 494,000
Fixed Income Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Percentage of investment portfolio valued using dealer quotes | 5.00% | 5.00%
Minimum [Member] | Fixed Income Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Percentage of investment portfolio valued using internal valuation models | 4.00% | 4.00%
Maximum [Member] | Fixed Income Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Percentage of investment portfolio valued using external pricing services | 91.00% | 91.00%
Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Derivative liabilities | $ 1,174,000 | $ 1,048,000
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs | 6.30% | 6.80%
Derivative assets | $ 243,000 | $ 239,000
Derivative assets | $ 243,000 | $ 239,000

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