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Summary of Estimated Fair Values of Bonds Held on Deposit (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	$ 46,470	$ 38,846
Remainder Related to Bonds Available for Sale
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	$ 10,400	$ 3,700

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