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Fair Value Measurements - Schedule of Assets Measured at Amortized Cost Net of Allowance For Credit Losses (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | $ 545,425 | $ 575,850
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 | 459,297 | 496,552
Corporate Bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 65,469 | 57,843
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 | 4,447 | 5,000
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 | 16,112 | 16,347
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 | 100 | 108
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 | 16,112 | 16,347
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 | 16,112 | 16,347
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 | 529,313 | 559,503
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 | 459,297 | 496,552
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 | 65,469 | 57,843
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 | 4,447 | 5,000
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 | $ 100 | $ 108

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