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Fair Value Measurements - Schedule of Assets Measured at Amortized Cost Net of Allowance For Credit Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | $ 430,353 | $ 473,092
States and Political Subdivisions [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 382,851 | 408,970
Corporate Bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 36,271 | 49,948
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 2,829 | 3,199
U.S. Treasury Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 8,386 | 10,939
Asset-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 16 | 36
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 8,386 | 10,939
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 8,386 | 10,939
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 421,967 | 462,153
Fair Value, Inputs, Level 2 [Member] | States and Political Subdivisions [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 382,851 | 408,970
Fair Value, Inputs, Level 2 [Member] | Corporate Bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 36,271 | 49,948
Fair Value, Inputs, Level 2 [Member] | U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 2,829 | 3,199
Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | $ 16 | $ 36

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