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Components of Net Realized Investment Gains (Losses) (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Net interest settlements | $ 0 | $ 1,816 | $ 0 | $ 6,540 |
Interest Rate Swap |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Net interest settlements |  | $ 1,100 | $ 0 | $ 2,500 | $ 0

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